What are the current PM10 levels at San Marcos, California?

The current PM10 levels in San Marcos, California are 71.223 μg/m3.

What are the current sulfur dioxide (SO2) levels at San Marcos, California?

The current sulfur dioxide (SO2) levels in San Marcos, California are 0.92 ppb.

What are the current ozone (O3) levels at San Marcos, California?

The current ozone (O3) levels at San Marcos, California is 17.381 ppm.

What are the current nitrogen dioxide (NO2) levels at San Marcos, California?

The current nitrogen dioxide (NO2) levels at San Marcos, California is 21.944 ppb.

Real-time air quality index in San Marcos, California today

Q: What are the current PM2.5 levels in San Marcos, California?

The measured PM2.5 levels in San Marcos, California at present are 25.402 μg/m3.

Stay updated with real-time air quality in San Marcos, California featuring accurate data on AQI, PM_2.5, PM₁₀, O₃, NO₂, SO₂, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.

Live AQI (Air Quality Index)

Moderate

San Marcos, California

Last updated: ... (Local time)

Common air pollutants in San Marcos, California

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

25.40 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

71.22 μg/m³

155

255

425

605+

Ozone (O₃)

17.38 ppb

201

201+

Sulfur Dioxide (SO₂)

0.92 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

21.94 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.94 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

San Marcos, California

Get Live Pollen Counts

San Marcos, California

Scroll To Air Quality Map

Track live San Marcos, California air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-12-11T10:00:00.000Z	38 \| good	6.722 \| good	18.697 \| good	22.952 \| good	0.789 \| good	17.171 \| good	0.728 \| good
2025-12-11T11:00:00.000Z	33 \| good	6.263 \| good	16.541 \| good	20.626 \| good	0.842 \| good	18.019 \| good	0.658 \| good
2025-12-11T12:00:00.000Z	27 \| good	4.553 \| good	16.631 \| good	27.496 \| good	0.746 \| good	19.39 \| good	0.671 \| good
2025-12-11T13:00:00.000Z	22 \| good	4.404 \| good	20.287 \| good	20.45 \| good	0.774 \| good	19 \| good	0.671 \| good
2025-12-11T14:00:00.000Z	22 \| good	4.289 \| good	13.942 \| good	14.139 \| good	0.798 \| good	14.901 \| good	0.753 \| good
2025-12-11T15:00:00.000Z	27 \| good	5.242 \| good	19.347 \| good	13.424 \| good	1.022 \| good	16.726 \| good	0.878 \| good
2025-12-11T16:00:00.000Z	23 \| good	3.569 \| good	24.673 \| good	16.428 \| good	1.181 \| good	17.425 \| good	1.094 \| good
2025-12-11T17:00:00.000Z	33 \| good	5.415 \| good	35.571 \| good	23.372 \| good	1.23 \| good	22.797 \| good	1.026 \| good
2025-12-11T18:00:00.000Z	33 \| good	6.002 \| good	32.805 \| good	19.663 \| good	1.015 \| good	20.132 \| good	0.708 \| good
2025-12-11T19:00:00.000Z	44 \| good	7.964 \| good	43.138 \| good	25.034 \| good	1.087 \| good	18.63 \| good	0.492 \| good
2025-12-11T20:00:00.000Z	44 \| good	7.568 \| good	41.65 \| good	34.798 \| good	1.259 \| good	20.828 \| good	0.305 \| good
2025-12-11T21:00:00.000Z	36 \| good	4.805 \| good	22.968 \| good	39.155 \| good	0.771 \| good	23.296 \| good	0.253 \| good
2025-12-11T22:00:00.000Z	54 \| moderate	11.151 \| good	36.099 \| good	40.842 \| good	0.458 \| good	19.61 \| good	0.271 \| good
2025-12-11T23:00:00.000Z	44 \| good	8.096 \| good	39.437 \| good	41.261 \| good	0.38 \| good	11.689 \| good	0.152 \| good
2025-12-12T00:00:00.000Z	38 \| good	7.322 \| good	37.591 \| good	38.351 \| good	0.3 \| good	14.483 \| good	0.271 \| good
2025-12-12T01:00:00.000Z	44 \| good	7.736 \| good	28.179 \| good	30.865 \| good	0.376 \| good	27.367 \| good	0.403 \| good
2025-12-12T02:00:00.000Z	56 \| moderate	11.952 \| good	37.967 \| good	30.961 \| good	0.509 \| good	35.529 \| good	0.495 \| good
2025-12-12T03:00:00.000Z	98 \| moderate	34.351 \| fine	149.439 \| fine	23.435 \| good	3.855 \| good	33.36 \| good	0.457 \| good
2025-12-12T04:00:00.000Z	67 \| moderate	17.894 \| fine	47.229 \| good	21.77 \| good	0.865 \| good	44.536 \| good	0.695 \| good
2025-12-12T05:00:00.000Z	66 \| moderate	16.945 \| fine	59.668 \| fine	24.1 \| good	0.987 \| good	41.896 \| good	0.711 \| good
2025-12-12T06:00:00.000Z	67 \| moderate	17.532 \| fine	37.471 \| good	8.898 \| good	0.819 \| good	39.294 \| good	0.744 \| good
2025-12-12T07:00:00.000Z	64 \| moderate	15.616 \| fine	37.486 \| good	8.619 \| good	0.823 \| good	35.655 \| good	0.744 \| good
2025-12-12T08:00:00.000Z	56 \| moderate	12.067 \| good	42.562 \| good	11.955 \| good	0.898 \| good	26.803 \| good	0.717 \| good
2025-12-12T09:00:00.000Z	60 \| moderate	14.155 \| fine	30.006 \| good	17.456 \| good	0.878 \| good	23.652 \| good	0.713 \| good
2025-12-12T10:00:00.000Z	58 \| moderate	13.164 \| fine	43.295 \| good	16.875 \| good	0.919 \| good	20.326 \| good	0.696 \| good
2025-12-12T11:00:00.000Z	52 \| moderate	9.672 \| good	22.813 \| good	19.083 \| good	0.857 \| good	17.996 \| good	0.608 \| good
2025-12-12T12:00:00.000Z	49 \| good	9.196 \| good	25.737 \| good	15.607 \| good	0.782 \| good	16.434 \| good	0.561 \| good
2025-12-12T13:00:00.000Z	52 \| moderate	9.906 \| good	27.884 \| good	12.368 \| good	0.783 \| good	16.009 \| good	0.561 \| good
2025-12-12T14:00:00.000Z	49 \| good	9.03 \| good	26.033 \| good	16.445 \| good	0.868 \| good	18.79 \| good	0.615 \| good
2025-12-12T15:00:00.000Z	49 \| good	9.399 \| good	28.884 \| good	17.155 \| good	1.069 \| good	19.742 \| good	0.768 \| good
2025-12-12T16:00:00.000Z	52 \| moderate	10.463 \| good	26.03 \| good	19.766 \| good	1.346 \| good	19.9 \| good	0.863 \| good
2025-12-12T17:00:00.000Z	66 \| moderate	17.063 \| fine	41.766 \| good	22.372 \| good	1.411 \| good	22.72 \| good	0.72 \| good
2025-12-12T18:00:00.000Z	49 \| good	9.145 \| good	36.83 \| good	26.168 \| good	1.16 \| good	22.526 \| good	0.526 \| good
2025-12-12T19:00:00.000Z	64 \| moderate	15.295 \| fine	81.346 \| fine	32.571 \| good	0.744 \| good	20.328 \| good	0.423 \| good
2025-12-12T20:00:00.000Z	60 \| moderate	13.521 \| fine	26.773 \| good	26.117 \| good	0.766 \| good	18.273 \| good	0.354 \| good
2025-12-12T21:00:00.000Z	60 \| moderate	14.115 \| fine	32.412 \| good	36.682 \| good	0.745 \| good	14.475 \| good	0.276 \| good
2025-12-12T22:00:00.000Z	69 \| moderate	19.474 \| fine	58.067 \| fine	36.802 \| good	0.679 \| good	11.204 \| good	0.276 \| good
2025-12-12T23:00:00.000Z	64 \| moderate	15.612 \| fine	44.099 \| good	37.816 \| good	0.536 \| good	14.065 \| good	0.257 \| good
2025-12-13T00:00:00.000Z	49 \| good	9.497 \| good	30.088 \| good	35.476 \| good	0.459 \| good	22.774 \| good	0.349 \| good
2025-12-13T01:00:00.000Z	49 \| good	9.026 \| good	28.029 \| good	37.189 \| good	0.518 \| good	30.853 \| good	0.489 \| good
2025-12-13T02:00:00.000Z	58 \| moderate	13.394 \| fine	41.389 \| good	33.819 \| good	0.535 \| good	29.946 \| good	0.607 \| good
2025-12-13T03:00:00.000Z	98 \| moderate	34.25 \| fine	148.8 \| fine	29.948 \| good	4.131 \| good	33.162 \| good	0.44 \| good
2025-12-13T04:00:00.000Z	67 \| moderate	17.971 \| fine	54.761 \| good	31.753 \| good	0.613 \| good	31.496 \| good	0.697 \| good
2025-12-13T05:00:00.000Z	66 \| moderate	17.288 \| fine	47.542 \| good	27.561 \| good	0.649 \| good	26.055 \| good	0.715 \| good
2025-12-13T06:00:00.000Z	66 \| moderate	17.318 \| fine	63.08 \| fine	27.069 \| good	0.869 \| good	26.709 \| good	0.812 \| good
2025-12-13T07:00:00.000Z	62 \| moderate	14.702 \| fine	48.04 \| good	23.806 \| good	0.874 \| good	27.557 \| good	0.812 \| good
2025-12-13T08:00:00.000Z	81 \| moderate	25.402 \| fine	71.223 \| fine	17.381 \| good	0.92 \| good	21.944 \| good	0.942 \| good
2025-12-13T09:00:00.000Z	77 \| moderate	22.907 \| fine	31.983 \| good	20.111 \| good	0.847 \| good	25.778 \| good	0.769 \| good
2025-12-13T09:00:00.000Z	81 \| moderate	25.402 \| fine	71.223 \| fine	17.381 \| good	0.92 \| good	21.944 \| good	0.942 \| good
2025-12-13T10:00:00.000Z	112 \| sensitive	39.814 \| moderate	176.161 \| moderate	23.486 \| good	1.999 \| good	21.369 \| good	0.343 \| good
2025-12-13T11:00:00.000Z	96 \| moderate	33.349 \| fine	145.954 \| fine	23.571 \| good	1.965 \| good	17.644 \| good	0.301 \| good
2025-12-13T12:00:00.000Z	84 \| moderate	26.96 \| fine	117.763 \| fine	23.58 \| good	1.93 \| good	13.919 \| good	0.259 \| good
2025-12-13T13:00:00.000Z	88 \| moderate	29.32 \| fine	127.91 \| fine	22.81 \| good	1.871 \| good	14.118 \| good	0.264 \| good
2025-12-13T14:00:00.000Z	75 \| moderate	21.682 \| fine	94.854 \| fine	21.256 \| good	1.812 \| good	14.317 \| good	0.269 \| good
2025-12-13T15:00:00.000Z	67 \| moderate	17.71 \| fine	78.474 \| fine	19.805 \| good	1.753 \| good	14.516 \| good	0.275 \| good
2025-12-13T16:00:00.000Z	69 \| moderate	19.081 \| fine	84.044 \| fine	21.793 \| good	2.093 \| good	12.943 \| good	0.271 \| good
2025-12-13T17:00:00.000Z	71 \| moderate	20.415 \| fine	89.357 \| fine	29.353 \| good	2.434 \| good	11.371 \| good	0.266 \| good
2025-12-13T18:00:00.000Z	79 \| moderate	24.021 \| fine	104.538 \| fine	39.595 \| good	2.774 \| good	9.798 \| good	0.262 \| good
2025-12-13T19:00:00.000Z	82 \| moderate	26.267 \| fine	114.401 \| fine	47.964 \| good	3.412 \| good	9.746 \| good	0.253 \| good
2025-12-13T20:00:00.000Z	88 \| moderate	29.369 \| fine	127.565 \| fine	53.546 \| good	4.05 \| good	9.695 \| good	0.244 \| good
2025-12-13T21:00:00.000Z	81 \| moderate	25.285 \| fine	110.147 \| fine	56.592 \| fine	4.688 \| good	9.643 \| good	0.236 \| good
2025-12-13T22:00:00.000Z	61 \| moderate	9.955 \| good	44.103 \| good	57.881 \| fine	4.939 \| good	14.625 \| good	0.251 \| good
2025-12-13T23:00:00.000Z	58 \| moderate	9.981 \| good	44.046 \| good	57.493 \| fine	5.19 \| good	19.607 \| good	0.267 \| good
2025-12-14T00:00:00.000Z	58 \| moderate	13.121 \| fine	58.033 \| fine	49.45 \| good	5.441 \| good	24.589 \| good	0.283 \| good
2025-12-14T01:00:00.000Z	67 \| moderate	18.069 \| fine	80.367 \| fine	39.227 \| good	5.269 \| good	28.155 \| good	0.337 \| good
2025-12-14T02:00:00.000Z	71 \| moderate	19.676 \| fine	86.293 \| fine	30.038 \| good	5.098 \| good	31.721 \| good	0.39 \| good
2025-12-14T03:00:00.000Z	79 \| moderate	24.286 \| fine	106.369 \| fine	25.598 \| good	4.927 \| good	35.287 \| good	0.444 \| good
2025-12-14T04:00:00.000Z	90 \| moderate	30.07 \| fine	130.147 \| fine	26.657 \| good	4.523 \| good	33.336 \| good	0.476 \| good
2025-12-14T05:00:00.000Z	96 \| moderate	32.607 \| fine	140.789 \| fine	26.87 \| good	4.119 \| good	31.385 \| good	0.508 \| good
2025-12-14T06:00:00.000Z	99 \| moderate	34.864 \| fine	151.361 \| fine	22.786 \| good	3.716 \| good	29.434 \| good	0.54 \| good
2025-12-14T07:00:00.000Z	102 \| sensitive	35.536 \| moderate	155.275 \| moderate	20.839 \| good	2.998 \| good	26.4 \| good	0.525 \| good
2025-12-14T08:00:00.000Z	100 \| moderate	34.836 \| fine	152.726 \| fine	22.071 \| good	2.281 \| good	23.366 \| good	0.511 \| good
2025-12-14T09:00:00.000Z	100 \| moderate	34.774 \| fine	152.569 \| fine	21.76 \| good	1.563 \| good	20.332 \| good	0.496 \| good
2025-12-14T10:00:00.000Z	97 \| moderate	33.722 \| fine	148.117 \| fine	21.14 \| good	1.277 \| good	17.93 \| good	0.466 \| good
2025-12-14T11:00:00.000Z	90 \| moderate	29.565 \| fine	128.539 \| fine	20.841 \| good	0.99 \| good	15.528 \| good	0.435 \| good
2025-12-14T12:00:00.000Z	82 \| moderate	25.657 \| fine	111.895 \| fine	19.373 \| good	0.703 \| good	13.126 \| good	0.404 \| good
2025-12-14T13:00:00.000Z	79 \| moderate	24.139 \| fine	105.602 \| fine	17.837 \| good	0.808 \| good	12.992 \| good	0.397 \| good
2025-12-14T14:00:00.000Z	75 \| moderate	21.71 \| fine	95.461 \| fine	15.901 \| good	0.913 \| good	12.859 \| good	0.389 \| good
2025-12-14T15:00:00.000Z	69 \| moderate	19.422 \| fine	84.841 \| fine	16.11 \| good	1.018 \| good	12.725 \| good	0.382 \| good
2025-12-14T16:00:00.000Z	66 \| moderate	17.433 \| fine	76.87 \| fine	17.972 \| good	1.22 \| good	12.263 \| good	0.366 \| good
2025-12-14T17:00:00.000Z	73 \| moderate	20.786 \| fine	90.855 \| fine	25.386 \| good	1.422 \| good	11.8 \| good	0.351 \| good
2025-12-14T18:00:00.000Z	82 \| moderate	26.298 \| fine	114.166 \| fine	34.742 \| good	1.624 \| good	11.337 \| good	0.336 \| good
2025-12-14T19:00:00.000Z	77 \| moderate	22.76 \| fine	99.82 \| fine	43.196 \| good	2.129 \| good	11.764 \| good	0.309 \| good
2025-12-14T20:00:00.000Z	81 \| moderate	25.004 \| fine	109.005 \| fine	50.527 \| good	2.633 \| good	12.192 \| good	0.283 \| good
2025-12-14T21:00:00.000Z	71 \| moderate	19.736 \| fine	86.771 \| fine	55.202 \| fine	3.138 \| good	12.619 \| good	0.257 \| good
2025-12-14T22:00:00.000Z	75 \| moderate	22.156 \| fine	97.021 \| fine	57.49 \| fine	3.555 \| good	17.46 \| good	0.27 \| good
2025-12-14T23:00:00.000Z	84 \| moderate	27.113 \| fine	118.279 \| fine	57.805 \| fine	3.973 \| good	22.302 \| good	0.283 \| good
2025-12-15T00:00:00.000Z	112 \| sensitive	39.593 \| moderate	174.698 \| moderate	48.04 \| good	4.39 \| good	27.143 \| good	0.296 \| good
2025-12-15T01:00:00.000Z	129 \| sensitive	46.638 \| moderate	209.499 \| moderate	37.734 \| good	4.335 \| good	30.981 \| good	0.356 \| good
2025-12-15T02:00:00.000Z	139 \| sensitive	51.091 \| moderate	230.574 \| moderate	29.899 \| good	4.28 \| good	34.818 \| good	0.415 \| good
2025-12-15T03:00:00.000Z	149 \| sensitive	54.959 \| moderate	247.061 \| moderate	24.502 \| good	4.225 \| good	38.656 \| good	0.474 \| good
2025-12-15T04:00:00.000Z	149 \| sensitive	54.601 \| moderate	243.787 \| moderate	22.972 \| good	3.728 \| good	35.651 \| good	0.486 \| good
2025-12-15T05:00:00.000Z	139 \| sensitive	51.315 \| moderate	231.382 \| moderate	23.315 \| good	3.231 \| good	32.646 \| good	0.498 \| good
2025-12-15T06:00:00.000Z	94 \| moderate	32.297 \| fine	33.078 \| good	1.68 \| good	2.768 \| good	29.979 \| good	0.519 \| good
2025-12-15T07:00:00.000Z	108 \| sensitive	38.164 \| moderate	169.696 \| moderate	18.918 \| good	2.108 \| good	25.908 \| good	0.479 \| good
2025-12-15T08:00:00.000Z	86 \| moderate	28.368 \| fine	123.524 \| fine	18.725 \| good	1.482 \| good	22.176 \| good	0.449 \| good
2025-12-15T09:00:00.000Z	67 \| moderate	18.367 \| fine	80.866 \| fine	19.575 \| good	0.855 \| good	18.444 \| good	0.419 \| good

San Marcos

Empower business decisions with accurate air quality data

San Marcos, California air quality map: Real-time AQI near you

0.88ppm

How accurate is California, USA air quality data?

Air quality measurements for California, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.

Source: Ambee Data Sources

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Check live rankings of places in the USA affected by air pollution.

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Frequently asked questions

How frequently is the air quality data for San Marcos, California updated?

Air quality data for San Marcos, California is updated on an hourly basis.

When did San Marcos, California experience the worst air quality in the last 24 hours?

The worst air quality in San Marcos, California was recorded at 03:00:00 on 2025-12-13.

When did San Marcos, California have its best air quality in the last 24 hours?

The best air quality in San Marcos, California was recorded at 01:00:00 on 2025-12-13.

What is the real-time air quality index for San Marcos, California?

The real-time air quality index in San Marcos, California is 81, currently categorized as Moderate.

Which pollutant is found most often in San Marcos, California?

The most common pollutant in San Marcos, California is PM2.5.

What can I do if the air quality in San Marcos, California is poor?

If the air quality in San Marcos, California is poor, limit outdoor activities and use a mask to safeguard your health.

What are the current PM_2.5 levels in San Marcos, California?

The measured PM_2.5 levels in San Marcos, California at present are 25.402 μg/m³.

What are the current PM₁₀ levels at San Marcos, California?

The current PM₁₀ levels in San Marcos, California are 71.223 μg/m³.

What are the current carbon monoxide (CO) levels at San Marcos, California?

The current carbon monoxide (CO) level in San Marcos, California is 0.942 ppm.

What are the current sulfur dioxide (SO₂) levels at San Marcos, California?

The current sulfur dioxide (SO₂) levels in San Marcos, California are 0.92 ppb.

What are the current ozone (O₃) levels at San Marcos, California?

The current ozone (O₃) levels at San Marcos, California is 17.381 ppm.

What are the current nitrogen dioxide (NO₂) levels at San Marcos, California?

The current nitrogen dioxide (NO₂) levels at San Marcos, California is 21.944 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-12-11T10:00:00.000Z	38 \| good	6.722 \| good	18.697 \| good	22.952 \| good	0.789 \| good	17.171 \| good	0.728 \| good
2025-12-11T11:00:00.000Z	33 \| good	6.263 \| good	16.541 \| good	20.626 \| good	0.842 \| good	18.019 \| good	0.658 \| good
2025-12-11T12:00:00.000Z	27 \| good	4.553 \| good	16.631 \| good	27.496 \| good	0.746 \| good	19.39 \| good	0.671 \| good
2025-12-11T13:00:00.000Z	22 \| good	4.404 \| good	20.287 \| good	20.45 \| good	0.774 \| good	19 \| good	0.671 \| good
2025-12-11T14:00:00.000Z	22 \| good	4.289 \| good	13.942 \| good	14.139 \| good	0.798 \| good	14.901 \| good	0.753 \| good
2025-12-11T15:00:00.000Z	27 \| good	5.242 \| good	19.347 \| good	13.424 \| good	1.022 \| good	16.726 \| good	0.878 \| good
2025-12-11T16:00:00.000Z	23 \| good	3.569 \| good	24.673 \| good	16.428 \| good	1.181 \| good	17.425 \| good	1.094 \| good
2025-12-11T17:00:00.000Z	33 \| good	5.415 \| good	35.571 \| good	23.372 \| good	1.23 \| good	22.797 \| good	1.026 \| good
2025-12-11T18:00:00.000Z	33 \| good	6.002 \| good	32.805 \| good	19.663 \| good	1.015 \| good	20.132 \| good	0.708 \| good
2025-12-11T19:00:00.000Z	44 \| good	7.964 \| good	43.138 \| good	25.034 \| good	1.087 \| good	18.63 \| good	0.492 \| good
2025-12-11T20:00:00.000Z	44 \| good	7.568 \| good	41.65 \| good	34.798 \| good	1.259 \| good	20.828 \| good	0.305 \| good
2025-12-11T21:00:00.000Z	36 \| good	4.805 \| good	22.968 \| good	39.155 \| good	0.771 \| good	23.296 \| good	0.253 \| good
2025-12-11T22:00:00.000Z	54 \| moderate	11.151 \| good	36.099 \| good	40.842 \| good	0.458 \| good	19.61 \| good	0.271 \| good
2025-12-11T23:00:00.000Z	44 \| good	8.096 \| good	39.437 \| good	41.261 \| good	0.38 \| good	11.689 \| good	0.152 \| good
2025-12-12T00:00:00.000Z	38 \| good	7.322 \| good	37.591 \| good	38.351 \| good	0.3 \| good	14.483 \| good	0.271 \| good
2025-12-12T01:00:00.000Z	44 \| good	7.736 \| good	28.179 \| good	30.865 \| good	0.376 \| good	27.367 \| good	0.403 \| good
2025-12-12T02:00:00.000Z	56 \| moderate	11.952 \| good	37.967 \| good	30.961 \| good	0.509 \| good	35.529 \| good	0.495 \| good
2025-12-12T03:00:00.000Z	98 \| moderate	34.351 \| fine	149.439 \| fine	23.435 \| good	3.855 \| good	33.36 \| good	0.457 \| good
2025-12-12T04:00:00.000Z	67 \| moderate	17.894 \| fine	47.229 \| good	21.77 \| good	0.865 \| good	44.536 \| good	0.695 \| good
2025-12-12T05:00:00.000Z	66 \| moderate	16.945 \| fine	59.668 \| fine	24.1 \| good	0.987 \| good	41.896 \| good	0.711 \| good
2025-12-12T06:00:00.000Z	67 \| moderate	17.532 \| fine	37.471 \| good	8.898 \| good	0.819 \| good	39.294 \| good	0.744 \| good
2025-12-12T07:00:00.000Z	64 \| moderate	15.616 \| fine	37.486 \| good	8.619 \| good	0.823 \| good	35.655 \| good	0.744 \| good
2025-12-12T08:00:00.000Z	56 \| moderate	12.067 \| good	42.562 \| good	11.955 \| good	0.898 \| good	26.803 \| good	0.717 \| good
2025-12-12T09:00:00.000Z	60 \| moderate	14.155 \| fine	30.006 \| good	17.456 \| good	0.878 \| good	23.652 \| good	0.713 \| good
2025-12-12T10:00:00.000Z	58 \| moderate	13.164 \| fine	43.295 \| good	16.875 \| good	0.919 \| good	20.326 \| good	0.696 \| good
2025-12-12T11:00:00.000Z	52 \| moderate	9.672 \| good	22.813 \| good	19.083 \| good	0.857 \| good	17.996 \| good	0.608 \| good
2025-12-12T12:00:00.000Z	49 \| good	9.196 \| good	25.737 \| good	15.607 \| good	0.782 \| good	16.434 \| good	0.561 \| good
2025-12-12T13:00:00.000Z	52 \| moderate	9.906 \| good	27.884 \| good	12.368 \| good	0.783 \| good	16.009 \| good	0.561 \| good
2025-12-12T14:00:00.000Z	49 \| good	9.03 \| good	26.033 \| good	16.445 \| good	0.868 \| good	18.79 \| good	0.615 \| good
2025-12-12T15:00:00.000Z	49 \| good	9.399 \| good	28.884 \| good	17.155 \| good	1.069 \| good	19.742 \| good	0.768 \| good
2025-12-12T16:00:00.000Z	52 \| moderate	10.463 \| good	26.03 \| good	19.766 \| good	1.346 \| good	19.9 \| good	0.863 \| good
2025-12-12T17:00:00.000Z	66 \| moderate	17.063 \| fine	41.766 \| good	22.372 \| good	1.411 \| good	22.72 \| good	0.72 \| good
2025-12-12T18:00:00.000Z	49 \| good	9.145 \| good	36.83 \| good	26.168 \| good	1.16 \| good	22.526 \| good	0.526 \| good
2025-12-12T19:00:00.000Z	64 \| moderate	15.295 \| fine	81.346 \| fine	32.571 \| good	0.744 \| good	20.328 \| good	0.423 \| good
2025-12-12T20:00:00.000Z	60 \| moderate	13.521 \| fine	26.773 \| good	26.117 \| good	0.766 \| good	18.273 \| good	0.354 \| good
2025-12-12T21:00:00.000Z	60 \| moderate	14.115 \| fine	32.412 \| good	36.682 \| good	0.745 \| good	14.475 \| good	0.276 \| good
2025-12-12T22:00:00.000Z	69 \| moderate	19.474 \| fine	58.067 \| fine	36.802 \| good	0.679 \| good	11.204 \| good	0.276 \| good
2025-12-12T23:00:00.000Z	64 \| moderate	15.612 \| fine	44.099 \| good	37.816 \| good	0.536 \| good	14.065 \| good	0.257 \| good
2025-12-13T00:00:00.000Z	49 \| good	9.497 \| good	30.088 \| good	35.476 \| good	0.459 \| good	22.774 \| good	0.349 \| good
2025-12-13T01:00:00.000Z	49 \| good	9.026 \| good	28.029 \| good	37.189 \| good	0.518 \| good	30.853 \| good	0.489 \| good
2025-12-13T02:00:00.000Z	58 \| moderate	13.394 \| fine	41.389 \| good	33.819 \| good	0.535 \| good	29.946 \| good	0.607 \| good
2025-12-13T03:00:00.000Z	98 \| moderate	34.25 \| fine	148.8 \| fine	29.948 \| good	4.131 \| good	33.162 \| good	0.44 \| good
2025-12-13T04:00:00.000Z	67 \| moderate	17.971 \| fine	54.761 \| good	31.753 \| good	0.613 \| good	31.496 \| good	0.697 \| good
2025-12-13T05:00:00.000Z	66 \| moderate	17.288 \| fine	47.542 \| good	27.561 \| good	0.649 \| good	26.055 \| good	0.715 \| good
2025-12-13T06:00:00.000Z	66 \| moderate	17.318 \| fine	63.08 \| fine	27.069 \| good	0.869 \| good	26.709 \| good	0.812 \| good
2025-12-13T07:00:00.000Z	62 \| moderate	14.702 \| fine	48.04 \| good	23.806 \| good	0.874 \| good	27.557 \| good	0.812 \| good
2025-12-13T08:00:00.000Z	81 \| moderate	25.402 \| fine	71.223 \| fine	17.381 \| good	0.92 \| good	21.944 \| good	0.942 \| good
2025-12-13T09:00:00.000Z	77 \| moderate	22.907 \| fine	31.983 \| good	20.111 \| good	0.847 \| good	25.778 \| good	0.769 \| good
2025-12-13T09:00:00.000Z	81 \| moderate	25.402 \| fine	71.223 \| fine	17.381 \| good	0.92 \| good	21.944 \| good	0.942 \| good
2025-12-13T10:00:00.000Z	112 \| sensitive	39.814 \| moderate	176.161 \| moderate	23.486 \| good	1.999 \| good	21.369 \| good	0.343 \| good
2025-12-13T11:00:00.000Z	96 \| moderate	33.349 \| fine	145.954 \| fine	23.571 \| good	1.965 \| good	17.644 \| good	0.301 \| good
2025-12-13T12:00:00.000Z	84 \| moderate	26.96 \| fine	117.763 \| fine	23.58 \| good	1.93 \| good	13.919 \| good	0.259 \| good
2025-12-13T13:00:00.000Z	88 \| moderate	29.32 \| fine	127.91 \| fine	22.81 \| good	1.871 \| good	14.118 \| good	0.264 \| good
2025-12-13T14:00:00.000Z	75 \| moderate	21.682 \| fine	94.854 \| fine	21.256 \| good	1.812 \| good	14.317 \| good	0.269 \| good
2025-12-13T15:00:00.000Z	67 \| moderate	17.71 \| fine	78.474 \| fine	19.805 \| good	1.753 \| good	14.516 \| good	0.275 \| good
2025-12-13T16:00:00.000Z	69 \| moderate	19.081 \| fine	84.044 \| fine	21.793 \| good	2.093 \| good	12.943 \| good	0.271 \| good
2025-12-13T17:00:00.000Z	71 \| moderate	20.415 \| fine	89.357 \| fine	29.353 \| good	2.434 \| good	11.371 \| good	0.266 \| good
2025-12-13T18:00:00.000Z	79 \| moderate	24.021 \| fine	104.538 \| fine	39.595 \| good	2.774 \| good	9.798 \| good	0.262 \| good
2025-12-13T19:00:00.000Z	82 \| moderate	26.267 \| fine	114.401 \| fine	47.964 \| good	3.412 \| good	9.746 \| good	0.253 \| good
2025-12-13T20:00:00.000Z	88 \| moderate	29.369 \| fine	127.565 \| fine	53.546 \| good	4.05 \| good	9.695 \| good	0.244 \| good
2025-12-13T21:00:00.000Z	81 \| moderate	25.285 \| fine	110.147 \| fine	56.592 \| fine	4.688 \| good	9.643 \| good	0.236 \| good
2025-12-13T22:00:00.000Z	61 \| moderate	9.955 \| good	44.103 \| good	57.881 \| fine	4.939 \| good	14.625 \| good	0.251 \| good
2025-12-13T23:00:00.000Z	58 \| moderate	9.981 \| good	44.046 \| good	57.493 \| fine	5.19 \| good	19.607 \| good	0.267 \| good
2025-12-14T00:00:00.000Z	58 \| moderate	13.121 \| fine	58.033 \| fine	49.45 \| good	5.441 \| good	24.589 \| good	0.283 \| good
2025-12-14T01:00:00.000Z	67 \| moderate	18.069 \| fine	80.367 \| fine	39.227 \| good	5.269 \| good	28.155 \| good	0.337 \| good
2025-12-14T02:00:00.000Z	71 \| moderate	19.676 \| fine	86.293 \| fine	30.038 \| good	5.098 \| good	31.721 \| good	0.39 \| good
2025-12-14T03:00:00.000Z	79 \| moderate	24.286 \| fine	106.369 \| fine	25.598 \| good	4.927 \| good	35.287 \| good	0.444 \| good
2025-12-14T04:00:00.000Z	90 \| moderate	30.07 \| fine	130.147 \| fine	26.657 \| good	4.523 \| good	33.336 \| good	0.476 \| good
2025-12-14T05:00:00.000Z	96 \| moderate	32.607 \| fine	140.789 \| fine	26.87 \| good	4.119 \| good	31.385 \| good	0.508 \| good
2025-12-14T06:00:00.000Z	99 \| moderate	34.864 \| fine	151.361 \| fine	22.786 \| good	3.716 \| good	29.434 \| good	0.54 \| good
2025-12-14T07:00:00.000Z	102 \| sensitive	35.536 \| moderate	155.275 \| moderate	20.839 \| good	2.998 \| good	26.4 \| good	0.525 \| good
2025-12-14T08:00:00.000Z	100 \| moderate	34.836 \| fine	152.726 \| fine	22.071 \| good	2.281 \| good	23.366 \| good	0.511 \| good
2025-12-14T09:00:00.000Z	100 \| moderate	34.774 \| fine	152.569 \| fine	21.76 \| good	1.563 \| good	20.332 \| good	0.496 \| good
2025-12-14T10:00:00.000Z	97 \| moderate	33.722 \| fine	148.117 \| fine	21.14 \| good	1.277 \| good	17.93 \| good	0.466 \| good
2025-12-14T11:00:00.000Z	90 \| moderate	29.565 \| fine	128.539 \| fine	20.841 \| good	0.99 \| good	15.528 \| good	0.435 \| good
2025-12-14T12:00:00.000Z	82 \| moderate	25.657 \| fine	111.895 \| fine	19.373 \| good	0.703 \| good	13.126 \| good	0.404 \| good
2025-12-14T13:00:00.000Z	79 \| moderate	24.139 \| fine	105.602 \| fine	17.837 \| good	0.808 \| good	12.992 \| good	0.397 \| good
2025-12-14T14:00:00.000Z	75 \| moderate	21.71 \| fine	95.461 \| fine	15.901 \| good	0.913 \| good	12.859 \| good	0.389 \| good
2025-12-14T15:00:00.000Z	69 \| moderate	19.422 \| fine	84.841 \| fine	16.11 \| good	1.018 \| good	12.725 \| good	0.382 \| good
2025-12-14T16:00:00.000Z	66 \| moderate	17.433 \| fine	76.87 \| fine	17.972 \| good	1.22 \| good	12.263 \| good	0.366 \| good
2025-12-14T17:00:00.000Z	73 \| moderate	20.786 \| fine	90.855 \| fine	25.386 \| good	1.422 \| good	11.8 \| good	0.351 \| good
2025-12-14T18:00:00.000Z	82 \| moderate	26.298 \| fine	114.166 \| fine	34.742 \| good	1.624 \| good	11.337 \| good	0.336 \| good
2025-12-14T19:00:00.000Z	77 \| moderate	22.76 \| fine	99.82 \| fine	43.196 \| good	2.129 \| good	11.764 \| good	0.309 \| good
2025-12-14T20:00:00.000Z	81 \| moderate	25.004 \| fine	109.005 \| fine	50.527 \| good	2.633 \| good	12.192 \| good	0.283 \| good
2025-12-14T21:00:00.000Z	71 \| moderate	19.736 \| fine	86.771 \| fine	55.202 \| fine	3.138 \| good	12.619 \| good	0.257 \| good
2025-12-14T22:00:00.000Z	75 \| moderate	22.156 \| fine	97.021 \| fine	57.49 \| fine	3.555 \| good	17.46 \| good	0.27 \| good
2025-12-14T23:00:00.000Z	84 \| moderate	27.113 \| fine	118.279 \| fine	57.805 \| fine	3.973 \| good	22.302 \| good	0.283 \| good
2025-12-15T00:00:00.000Z	112 \| sensitive	39.593 \| moderate	174.698 \| moderate	48.04 \| good	4.39 \| good	27.143 \| good	0.296 \| good
2025-12-15T01:00:00.000Z	129 \| sensitive	46.638 \| moderate	209.499 \| moderate	37.734 \| good	4.335 \| good	30.981 \| good	0.356 \| good
2025-12-15T02:00:00.000Z	139 \| sensitive	51.091 \| moderate	230.574 \| moderate	29.899 \| good	4.28 \| good	34.818 \| good	0.415 \| good
2025-12-15T03:00:00.000Z	149 \| sensitive	54.959 \| moderate	247.061 \| moderate	24.502 \| good	4.225 \| good	38.656 \| good	0.474 \| good
2025-12-15T04:00:00.000Z	149 \| sensitive	54.601 \| moderate	243.787 \| moderate	22.972 \| good	3.728 \| good	35.651 \| good	0.486 \| good
2025-12-15T05:00:00.000Z	139 \| sensitive	51.315 \| moderate	231.382 \| moderate	23.315 \| good	3.231 \| good	32.646 \| good	0.498 \| good
2025-12-15T06:00:00.000Z	94 \| moderate	32.297 \| fine	33.078 \| good	1.68 \| good	2.768 \| good	29.979 \| good	0.519 \| good
2025-12-15T07:00:00.000Z	108 \| sensitive	38.164 \| moderate	169.696 \| moderate	18.918 \| good	2.108 \| good	25.908 \| good	0.479 \| good
2025-12-15T08:00:00.000Z	86 \| moderate	28.368 \| fine	123.524 \| fine	18.725 \| good	1.482 \| good	22.176 \| good	0.449 \| good
2025-12-15T09:00:00.000Z	67 \| moderate	18.367 \| fine	80.866 \| fine	19.575 \| good	0.855 \| good	18.444 \| good	0.419 \| good

Real-time air quality index in San Marcos, California today

Common air pollutants in San Marcos, California

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live San Marcos, California air quality forecast and history

Empower business decisions with accurate air quality data

San Marcos, California air quality map: Real-time AQI near you

Air quality in nearby cities

Escondido, California

Vista, California

Valley Center, California

Encinitas, California

Carlsbad, California

Solana Beach, California

How accurate is California, USA air quality data?

Air quality levels in US

Frequently asked questions

How frequently is the air quality data for San Marcos, California updated?

When did San Marcos, California experience the worst air quality in the last 24 hours?

When did San Marcos, California have its best air quality in the last 24 hours?

What is the real-time air quality index for San Marcos, California?

Which pollutant is found most often in San Marcos, California?

What can I do if the air quality in San Marcos, California is poor?

What are the current PM2.5 levels in San Marcos, California?

What are the current PM10 levels at San Marcos, California?

What are the current carbon monoxide (CO) levels at San Marcos, California?

What are the current sulfur dioxide (SO2) levels at San Marcos, California?

What are the current ozone (O3) levels at San Marcos, California?

What are the current nitrogen dioxide (NO2) levels at San Marcos, California?

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What are the current PM_2.5 levels in San Marcos, California?

What are the current PM₁₀ levels at San Marcos, California?

What are the current sulfur dioxide (SO₂) levels at San Marcos, California?

What are the current ozone (O₃) levels at San Marcos, California?

What are the current nitrogen dioxide (NO₂) levels at San Marcos, California?