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

The current PM10 levels in San Marcos, California are 16.507 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 0.764 ppb.

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

The current ozone (O3) levels at San Marcos, California is 4.563 ppm.

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

The current nitrogen dioxide (NO2) levels at San Marcos, California is 11.311 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 3.62 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)

Good

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)

3.62 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

16.51 μg/m³

155

255

425

605+

Ozone (O₃)

4.56 ppb

201

201+

Sulfur Dioxide (SO₂)

0.76 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

11.31 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.38 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
2026-09-05T13:00:00.000Z	29 \| good	4.338 \| good	26.144 \| good	31.113 \| good	0.42 \| good	11.198 \| good	0.391 \| good
2026-09-05T14:00:00.000Z	26 \| good	3.71 \| good	17.394 \| good	28.41 \| good	0.5 \| good	14.326 \| good	0.519 \| good
2026-09-05T15:00:00.000Z	27 \| good	3.426 \| good	18.088 \| good	28.916 \| good	0.725 \| good	12.159 \| good	0.507 \| good
2026-09-05T16:00:00.000Z	30 \| good	4.262 \| good	17.808 \| good	31.518 \| good	0.632 \| good	19.477 \| good	0.446 \| good
2026-09-05T17:00:00.000Z	31 \| good	2.662 \| good	27.584 \| good	32.662 \| good	0.566 \| good	18.887 \| good	0.366 \| good
2026-09-05T18:00:00.000Z	34 \| good	3.484 \| good	19.494 \| good	37.36 \| good	0.545 \| good	11.228 \| good	0.362 \| good
2026-09-05T19:00:00.000Z	38 \| good	5.367 \| good	28.04 \| good	41.147 \| good	0.541 \| good	7.895 \| good	0.317 \| good
2026-09-05T20:00:00.000Z	44 \| good	4.209 \| good	24.33 \| good	47.035 \| good	0.523 \| good	2.621 \| good	0.271 \| good
2026-09-05T21:00:00.000Z	41 \| good	5.763 \| good	22.233 \| good	43.853 \| good	0.499 \| good	3.083 \| good	0.296 \| good
2026-09-05T22:00:00.000Z	39 \| good	4.737 \| good	20.872 \| good	42.062 \| good	0.456 \| good	3.354 \| good	0.271 \| good
2026-09-05T23:00:00.000Z	41 \| good	4.886 \| good	23.185 \| good	43.84 \| good	0.626 \| good	1.257 \| good	0.289 \| good
2026-09-06T00:00:00.000Z	48 \| good	4.346 \| good	13.811 \| good	51.822 \| good	0.677 \| good	4.535 \| good	0.292 \| good
2026-09-06T01:00:00.000Z	43 \| good	3.516 \| good	12.438 \| good	46.494 \| good	0.649 \| good	4.986 \| good	0.325 \| good
2026-09-06T02:00:00.000Z	34 \| good	4.788 \| good	14.274 \| good	37.211 \| good	0.645 \| good	5.66 \| good	0.349 \| good
2026-09-06T03:00:00.000Z	44 \| good	7.536 \| good	33.465 \| good	31.996 \| good	0.38 \| good	3.425 \| good	0.127 \| good
2026-09-06T04:00:00.000Z	34 \| good	4.379 \| good	12.295 \| good	36.516 \| good	0.632 \| good	4.729 \| good	0.388 \| good
2026-09-06T05:00:00.000Z	33 \| good	5.899 \| good	20.553 \| good	31.981 \| good	0.809 \| good	8.856 \| good	0.462 \| good
2026-09-06T06:00:00.000Z	28 \| good	4.933 \| good	20.274 \| good	30.373 \| good	0.654 \| good	14.257 \| good	0.479 \| good
2026-09-06T07:00:00.000Z	27 \| good	4.428 \| good	12.029 \| good	28.644 \| good	0.608 \| good	14.069 \| good	0.489 \| good
2026-09-06T08:00:00.000Z	33 \| good	6.129 \| good	27.556 \| good	26.155 \| good	0.539 \| good	16.123 \| good	0.535 \| good
2026-09-06T09:00:00.000Z	38 \| good	7.127 \| good	25.364 \| good	22.672 \| good	0.61 \| good	15.783 \| good	0.453 \| good
2026-09-06T10:00:00.000Z	49 \| good	8.572 \| good	26.875 \| good	22.685 \| good	0.609 \| good	12.959 \| good	0.453 \| good
2026-09-06T11:00:00.000Z	38 \| good	6.807 \| good	25.968 \| good	25.258 \| good	0.608 \| good	11.24 \| good	0.453 \| good
2026-09-06T12:00:00.000Z	38 \| good	6.547 \| good	21.727 \| good	20.147 \| good	0.496 \| good	20.385 \| good	0.431 \| good
2026-09-06T13:00:00.000Z	44 \| good	7.898 \| good	29.734 \| good	19.62 \| good	0.496 \| good	16.751 \| good	0.431 \| good
2026-09-06T14:00:00.000Z	38 \| good	6.817 \| good	28.921 \| good	20.407 \| good	0.483 \| good	19.453 \| good	0.414 \| good
2026-09-06T15:00:00.000Z	49 \| good	8.889 \| good	20.392 \| good	19.661 \| good	0.496 \| good	18.176 \| good	0.351 \| good
2026-09-06T16:00:00.000Z	33 \| good	6.471 \| good	25.71 \| good	20.701 \| good	0.456 \| good	16.661 \| good	0.342 \| good
2026-09-06T17:00:00.000Z	54 \| moderate	11.258 \| good	42.912 \| good	19.089 \| good	0.495 \| good	13.331 \| good	0.385 \| good
2026-09-06T18:00:00.000Z	56 \| moderate	12.477 \| fine	40.194 \| good	19.932 \| good	0.454 \| good	8.473 \| good	0.376 \| good
2026-09-06T19:00:00.000Z	49 \| good	8.962 \| good	28.708 \| good	28.363 \| good	0.426 \| good	7.835 \| good	0.307 \| good
2026-09-06T20:00:00.000Z	45 \| good	6.8 \| good	49.25 \| good	23.474 \| good	0.413 \| good	5.688 \| good	0.316 \| good
2026-09-06T21:00:00.000Z	47 \| good	8.169 \| good	50.961 \| good	20.168 \| good	0.427 \| good	3.046 \| good	0.25 \| good
2026-09-06T22:00:00.000Z	44 \| good	7.662 \| good	28.688 \| good	21.199 \| good	0.414 \| good	3.578 \| good	0.25 \| good
2026-09-06T23:00:00.000Z	33 \| good	5.838 \| good	18.525 \| good	23.182 \| good	0.441 \| good	5.339 \| good	0.287 \| good
2026-09-07T00:00:00.000Z	16 \| good	2.875 \| good	16.434 \| good	15.288 \| good	0.474 \| good	4.023 \| good	0.285 \| good
2026-09-07T01:00:00.000Z	42 \| good	5.275 \| good	44.734 \| good	17.798 \| good	0.489 \| good	5.489 \| good	0.332 \| good
2026-09-07T02:00:00.000Z	17 \| good	2.544 \| good	11.344 \| good	17.676 \| good	0.434 \| good	6.465 \| good	0.337 \| good
2026-09-07T03:00:00.000Z	22 \| good	3.431 \| good	14.407 \| good	24.163 \| good	0.287 \| good	6.063 \| good	0.128 \| good
2026-09-07T04:00:00.000Z	22 \| good	4.229 \| good	9.573 \| good	13.236 \| good	0.448 \| good	8.025 \| good	0.456 \| good
2026-09-07T05:00:00.000Z	33 \| good	5.949 \| good	15.666 \| good	9.753 \| good	0.626 \| good	11.057 \| good	0.544 \| good
2026-09-07T06:00:00.000Z	22 \| good	4.179 \| good	13.285 \| good	9.843 \| good	0.553 \| good	12.367 \| good	0.582 \| good
2026-09-07T07:00:00.000Z	22 \| good	4.093 \| good	13.246 \| good	7.329 \| good	0.552 \| good	11.722 \| good	0.564 \| good
2026-09-07T08:00:00.000Z	27 \| good	4.542 \| good	20.444 \| good	6.268 \| good	0.588 \| good	10.494 \| good	0.501 \| good
2026-09-07T09:00:00.000Z	33 \| good	5.844 \| good	27.098 \| good	5.257 \| good	0.63 \| good	9.835 \| good	0.464 \| good
2026-09-07T10:00:00.000Z	33 \| good	5.929 \| good	14.005 \| good	5.848 \| good	0.558 \| good	10.49 \| good	0.385 \| good
2026-09-07T11:00:00.000Z	16 \| good	2.694 \| good	16.337 \| good	4.436 \| good	0.758 \| good	9.432 \| good	0.38 \| good
2026-09-07T12:00:00.000Z	22 \| good	3.62 \| good	16.507 \| good	4.563 \| good	0.764 \| good	11.311 \| good	0.381 \| good
2026-09-07T13:00:00.000Z	22 \| good	4.475 \| good	19.372 \| good	11.584 \| good	0.263 \| good	11.082 \| good	0.183 \| good
2026-09-07T14:00:00.000Z	27 \| good	4.856 \| good	21.555 \| good	13.825 \| good	0.271 \| good	9.316 \| good	0.186 \| good
2026-09-07T15:00:00.000Z	22 \| good	3.798 \| good	16.378 \| good	22.424 \| good	0.316 \| good	7.498 \| good	0.189 \| good
2026-09-07T16:00:00.000Z	29 \| good	4.586 \| good	20.427 \| good	31.149 \| good	0.345 \| good	4.167 \| good	0.142 \| good
2026-09-07T17:00:00.000Z	35 \| good	5.122 \| good	22.481 \| good	37.993 \| good	0.374 \| good	3.103 \| good	0.126 \| good
2026-09-07T18:00:00.000Z	40 \| good	5.181 \| good	22.696 \| good	43.247 \| good	0.363 \| good	2.635 \| good	0.119 \| good
2026-09-07T19:00:00.000Z	44 \| good	4.4 \| good	19.248 \| good	47.118 \| good	0.348 \| good	2.249 \| good	0.115 \| good
2026-09-07T20:00:00.000Z	45 \| good	5.721 \| good	24.875 \| good	49.089 \| good	0.344 \| good	1.929 \| good	0.113 \| good
2026-09-07T21:00:00.000Z	44 \| good	7.017 \| good	30.964 \| good	48.441 \| good	0.352 \| good	1.653 \| good	0.11 \| good
2026-09-07T22:00:00.000Z	45 \| good	7.857 \| good	34.556 \| good	49.052 \| good	0.348 \| good	1.399 \| good	0.108 \| good
2026-09-07T23:00:00.000Z	49 \| good	9.041 \| good	39.922 \| good	52.921 \| good	0.345 \| good	1.271 \| good	0.106 \| good
2026-09-08T00:00:00.000Z	49 \| good	9.487 \| good	42.414 \| good	52.047 \| good	0.398 \| good	1.452 \| good	0.106 \| good
2026-09-08T01:00:00.000Z	49 \| good	8.803 \| good	38.739 \| good	46.595 \| good	0.52 \| good	2.169 \| good	0.111 \| good
2026-09-08T02:00:00.000Z	49 \| good	8.92 \| good	39.066 \| good	39.458 \| good	0.664 \| good	3.553 \| good	0.118 \| good
2026-09-08T03:00:00.000Z	52 \| moderate	9.742 \| good	43.201 \| good	34.016 \| good	0.763 \| good	5.104 \| good	0.128 \| good
2026-09-08T04:00:00.000Z	52 \| moderate	10.116 \| good	44.843 \| good	29.658 \| good	0.826 \| good	6.911 \| good	0.138 \| good
2026-09-08T05:00:00.000Z	49 \| good	9.471 \| good	42.309 \| good	26.168 \| good	0.872 \| good	9.113 \| good	0.15 \| good
2026-09-08T06:00:00.000Z	52 \| moderate	9.685 \| good	43.109 \| good	22.935 \| good	0.918 \| good	11.453 \| good	0.162 \| good
2026-09-08T07:00:00.000Z	49 \| good	9.437 \| good	41.892 \| good	20.77 \| good	0.947 \| good	14.201 \| good	0.177 \| good
2026-09-08T08:00:00.000Z	52 \| moderate	9.767 \| good	43.22 \| good	20.163 \| good	0.933 \| good	15.756 \| good	0.187 \| good
2026-09-08T09:00:00.000Z	52 \| moderate	10.054 \| good	44.797 \| good	20.915 \| good	0.906 \| good	16.33 \| good	0.192 \| good
2026-09-08T10:00:00.000Z	49 \| good	9.373 \| good	41.575 \| good	22.272 \| good	0.841 \| good	16.053 \| good	0.194 \| good
2026-09-08T11:00:00.000Z	52 \| moderate	9.729 \| good	43.428 \| good	24.546 \| good	0.745 \| good	15.324 \| good	0.193 \| good
2026-09-08T12:00:00.000Z	52 \| moderate	9.996 \| good	44.286 \| good	25.158 \| good	0.662 \| good	14.237 \| good	0.19 \| good
2026-09-08T13:00:00.000Z	54 \| moderate	10.569 \| good	47.132 \| good	25.578 \| good	0.613 \| good	12.95 \| good	0.185 \| good
2026-09-08T14:00:00.000Z	56 \| moderate	11.573 \| good	51.446 \| good	26.416 \| good	0.593 \| good	11.051 \| good	0.187 \| good
2026-09-08T15:00:00.000Z	49 \| good	9.109 \| good	40.271 \| good	34.184 \| good	0.653 \| good	8.632 \| good	0.19 \| good
2026-09-08T16:00:00.000Z	38 \| good	6.783 \| good	29.643 \| good	39.866 \| good	0.806 \| good	4.818 \| good	0.146 \| good
2026-09-08T17:00:00.000Z	41 \| good	5.704 \| good	25.016 \| good	43.953 \| good	0.865 \| good	3.48 \| good	0.132 \| good
2026-09-08T18:00:00.000Z	45 \| good	6.053 \| good	26.47 \| good	48.608 \| good	0.882 \| good	2.698 \| good	0.125 \| good
2026-09-08T19:00:00.000Z	50 \| good	8.62 \| good	37.948 \| good	54.474 \| good	0.901 \| good	2.205 \| good	0.122 \| good
2026-09-08T20:00:00.000Z	71 \| moderate	12.07 \| good	54.097 \| good	61.019 \| fine	0.905 \| good	1.904 \| good	0.121 \| good
2026-09-08T21:00:00.000Z	80 \| moderate	13.476 \| fine	60.462 \| fine	64.414 \| fine	0.897 \| good	1.753 \| good	0.121 \| good
2026-09-08T22:00:00.000Z	84 \| moderate	12.789 \| fine	57.345 \| fine	65.2 \| fine	0.903 \| good	1.743 \| good	0.123 \| good
2026-09-08T23:00:00.000Z	77 \| moderate	10.672 \| good	47.154 \| good	62.616 \| fine	0.929 \| good	1.899 \| good	0.125 \| good
2026-09-09T00:00:00.000Z	51 \| moderate	8.492 \| good	37.148 \| good	54.818 \| good	0.987 \| good	2.273 \| good	0.128 \| good
2026-09-09T01:00:00.000Z	43 \| good	6.329 \| good	28.102 \| good	46.368 \| good	1.035 \| good	3.087 \| good	0.132 \| good
2026-09-09T02:00:00.000Z	34 \| good	6.007 \| good	26.495 \| good	37.102 \| good	1.05 \| good	4.502 \| good	0.136 \| good
2026-09-09T03:00:00.000Z	33 \| good	6.494 \| good	28.989 \| good	33.988 \| good	1.031 \| good	6.111 \| good	0.145 \| good
2026-09-09T04:00:00.000Z	38 \| good	7.229 \| good	31.741 \| good	31.458 \| good	1.021 \| good	8.137 \| good	0.155 \| good
2026-09-09T05:00:00.000Z	38 \| good	7.151 \| good	31.602 \| good	27.842 \| good	1.031 \| good	10.508 \| good	0.165 \| good
2026-09-09T06:00:00.000Z	44 \| good	7.988 \| good	35.025 \| good	24.316 \| good	1.051 \| good	11.992 \| good	0.175 \| good
2026-09-09T07:00:00.000Z	44 \| good	8.255 \| good	36.152 \| good	23.509 \| good	1.051 \| good	13.669 \| good	0.187 \| good
2026-09-09T08:00:00.000Z	52 \| moderate	9.518 \| good	42.211 \| good	24.141 \| good	0.996 \| good	14.104 \| good	0.193 \| good
2026-09-09T09:00:00.000Z	52 \| moderate	9.736 \| good	43.361 \| good	26.398 \| good	0.902 \| good	14.363 \| good	0.198 \| good
2026-09-09T10:00:00.000Z	52 \| moderate	10.15 \| good	44.738 \| good	25.678 \| good	0.816 \| good	14.156 \| good	0.199 \| good
2026-09-09T11:00:00.000Z	52 \| moderate	10.232 \| good	45.528 \| good	26.258 \| good	0.751 \| good	13.685 \| good	0.2 \| good
2026-09-09T12:00:00.000Z	64 \| moderate	16.163 \| fine	17.583 \| good	9.633 \| good	0.695 \| good	13.204 \| good	0.201 \| good

San Marcos

Empower business decisions with accurate air quality data

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

0.38ppm

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 06:00:00 on 2026-09-06.

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 11:00:00 on 2026-09-07.

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

The real-time air quality index in San Marcos, California is 22, currently categorized as Good.

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 3.62 μg/m³.

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

The current PM₁₀ levels in San Marcos, California are 16.507 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 0.381 ppm.

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

The current sulfur dioxide (SO₂) levels in San Marcos, California are 0.764 ppb.

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

The current ozone (O₃) levels at San Marcos, California is 4.563 ppm.

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

The current nitrogen dioxide (NO₂) levels at San Marcos, California is 11.311 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-09-05T13:00:00.000Z	29 \| good	4.338 \| good	26.144 \| good	31.113 \| good	0.42 \| good	11.198 \| good	0.391 \| good
2026-09-05T14:00:00.000Z	26 \| good	3.71 \| good	17.394 \| good	28.41 \| good	0.5 \| good	14.326 \| good	0.519 \| good
2026-09-05T15:00:00.000Z	27 \| good	3.426 \| good	18.088 \| good	28.916 \| good	0.725 \| good	12.159 \| good	0.507 \| good
2026-09-05T16:00:00.000Z	30 \| good	4.262 \| good	17.808 \| good	31.518 \| good	0.632 \| good	19.477 \| good	0.446 \| good
2026-09-05T17:00:00.000Z	31 \| good	2.662 \| good	27.584 \| good	32.662 \| good	0.566 \| good	18.887 \| good	0.366 \| good
2026-09-05T18:00:00.000Z	34 \| good	3.484 \| good	19.494 \| good	37.36 \| good	0.545 \| good	11.228 \| good	0.362 \| good
2026-09-05T19:00:00.000Z	38 \| good	5.367 \| good	28.04 \| good	41.147 \| good	0.541 \| good	7.895 \| good	0.317 \| good
2026-09-05T20:00:00.000Z	44 \| good	4.209 \| good	24.33 \| good	47.035 \| good	0.523 \| good	2.621 \| good	0.271 \| good
2026-09-05T21:00:00.000Z	41 \| good	5.763 \| good	22.233 \| good	43.853 \| good	0.499 \| good	3.083 \| good	0.296 \| good
2026-09-05T22:00:00.000Z	39 \| good	4.737 \| good	20.872 \| good	42.062 \| good	0.456 \| good	3.354 \| good	0.271 \| good
2026-09-05T23:00:00.000Z	41 \| good	4.886 \| good	23.185 \| good	43.84 \| good	0.626 \| good	1.257 \| good	0.289 \| good
2026-09-06T00:00:00.000Z	48 \| good	4.346 \| good	13.811 \| good	51.822 \| good	0.677 \| good	4.535 \| good	0.292 \| good
2026-09-06T01:00:00.000Z	43 \| good	3.516 \| good	12.438 \| good	46.494 \| good	0.649 \| good	4.986 \| good	0.325 \| good
2026-09-06T02:00:00.000Z	34 \| good	4.788 \| good	14.274 \| good	37.211 \| good	0.645 \| good	5.66 \| good	0.349 \| good
2026-09-06T03:00:00.000Z	44 \| good	7.536 \| good	33.465 \| good	31.996 \| good	0.38 \| good	3.425 \| good	0.127 \| good
2026-09-06T04:00:00.000Z	34 \| good	4.379 \| good	12.295 \| good	36.516 \| good	0.632 \| good	4.729 \| good	0.388 \| good
2026-09-06T05:00:00.000Z	33 \| good	5.899 \| good	20.553 \| good	31.981 \| good	0.809 \| good	8.856 \| good	0.462 \| good
2026-09-06T06:00:00.000Z	28 \| good	4.933 \| good	20.274 \| good	30.373 \| good	0.654 \| good	14.257 \| good	0.479 \| good
2026-09-06T07:00:00.000Z	27 \| good	4.428 \| good	12.029 \| good	28.644 \| good	0.608 \| good	14.069 \| good	0.489 \| good
2026-09-06T08:00:00.000Z	33 \| good	6.129 \| good	27.556 \| good	26.155 \| good	0.539 \| good	16.123 \| good	0.535 \| good
2026-09-06T09:00:00.000Z	38 \| good	7.127 \| good	25.364 \| good	22.672 \| good	0.61 \| good	15.783 \| good	0.453 \| good
2026-09-06T10:00:00.000Z	49 \| good	8.572 \| good	26.875 \| good	22.685 \| good	0.609 \| good	12.959 \| good	0.453 \| good
2026-09-06T11:00:00.000Z	38 \| good	6.807 \| good	25.968 \| good	25.258 \| good	0.608 \| good	11.24 \| good	0.453 \| good
2026-09-06T12:00:00.000Z	38 \| good	6.547 \| good	21.727 \| good	20.147 \| good	0.496 \| good	20.385 \| good	0.431 \| good
2026-09-06T13:00:00.000Z	44 \| good	7.898 \| good	29.734 \| good	19.62 \| good	0.496 \| good	16.751 \| good	0.431 \| good
2026-09-06T14:00:00.000Z	38 \| good	6.817 \| good	28.921 \| good	20.407 \| good	0.483 \| good	19.453 \| good	0.414 \| good
2026-09-06T15:00:00.000Z	49 \| good	8.889 \| good	20.392 \| good	19.661 \| good	0.496 \| good	18.176 \| good	0.351 \| good
2026-09-06T16:00:00.000Z	33 \| good	6.471 \| good	25.71 \| good	20.701 \| good	0.456 \| good	16.661 \| good	0.342 \| good
2026-09-06T17:00:00.000Z	54 \| moderate	11.258 \| good	42.912 \| good	19.089 \| good	0.495 \| good	13.331 \| good	0.385 \| good
2026-09-06T18:00:00.000Z	56 \| moderate	12.477 \| fine	40.194 \| good	19.932 \| good	0.454 \| good	8.473 \| good	0.376 \| good
2026-09-06T19:00:00.000Z	49 \| good	8.962 \| good	28.708 \| good	28.363 \| good	0.426 \| good	7.835 \| good	0.307 \| good
2026-09-06T20:00:00.000Z	45 \| good	6.8 \| good	49.25 \| good	23.474 \| good	0.413 \| good	5.688 \| good	0.316 \| good
2026-09-06T21:00:00.000Z	47 \| good	8.169 \| good	50.961 \| good	20.168 \| good	0.427 \| good	3.046 \| good	0.25 \| good
2026-09-06T22:00:00.000Z	44 \| good	7.662 \| good	28.688 \| good	21.199 \| good	0.414 \| good	3.578 \| good	0.25 \| good
2026-09-06T23:00:00.000Z	33 \| good	5.838 \| good	18.525 \| good	23.182 \| good	0.441 \| good	5.339 \| good	0.287 \| good
2026-09-07T00:00:00.000Z	16 \| good	2.875 \| good	16.434 \| good	15.288 \| good	0.474 \| good	4.023 \| good	0.285 \| good
2026-09-07T01:00:00.000Z	42 \| good	5.275 \| good	44.734 \| good	17.798 \| good	0.489 \| good	5.489 \| good	0.332 \| good
2026-09-07T02:00:00.000Z	17 \| good	2.544 \| good	11.344 \| good	17.676 \| good	0.434 \| good	6.465 \| good	0.337 \| good
2026-09-07T03:00:00.000Z	22 \| good	3.431 \| good	14.407 \| good	24.163 \| good	0.287 \| good	6.063 \| good	0.128 \| good
2026-09-07T04:00:00.000Z	22 \| good	4.229 \| good	9.573 \| good	13.236 \| good	0.448 \| good	8.025 \| good	0.456 \| good
2026-09-07T05:00:00.000Z	33 \| good	5.949 \| good	15.666 \| good	9.753 \| good	0.626 \| good	11.057 \| good	0.544 \| good
2026-09-07T06:00:00.000Z	22 \| good	4.179 \| good	13.285 \| good	9.843 \| good	0.553 \| good	12.367 \| good	0.582 \| good
2026-09-07T07:00:00.000Z	22 \| good	4.093 \| good	13.246 \| good	7.329 \| good	0.552 \| good	11.722 \| good	0.564 \| good
2026-09-07T08:00:00.000Z	27 \| good	4.542 \| good	20.444 \| good	6.268 \| good	0.588 \| good	10.494 \| good	0.501 \| good
2026-09-07T09:00:00.000Z	33 \| good	5.844 \| good	27.098 \| good	5.257 \| good	0.63 \| good	9.835 \| good	0.464 \| good
2026-09-07T10:00:00.000Z	33 \| good	5.929 \| good	14.005 \| good	5.848 \| good	0.558 \| good	10.49 \| good	0.385 \| good
2026-09-07T11:00:00.000Z	16 \| good	2.694 \| good	16.337 \| good	4.436 \| good	0.758 \| good	9.432 \| good	0.38 \| good
2026-09-07T12:00:00.000Z	22 \| good	3.62 \| good	16.507 \| good	4.563 \| good	0.764 \| good	11.311 \| good	0.381 \| good
2026-09-07T13:00:00.000Z	22 \| good	4.475 \| good	19.372 \| good	11.584 \| good	0.263 \| good	11.082 \| good	0.183 \| good
2026-09-07T14:00:00.000Z	27 \| good	4.856 \| good	21.555 \| good	13.825 \| good	0.271 \| good	9.316 \| good	0.186 \| good
2026-09-07T15:00:00.000Z	22 \| good	3.798 \| good	16.378 \| good	22.424 \| good	0.316 \| good	7.498 \| good	0.189 \| good
2026-09-07T16:00:00.000Z	29 \| good	4.586 \| good	20.427 \| good	31.149 \| good	0.345 \| good	4.167 \| good	0.142 \| good
2026-09-07T17:00:00.000Z	35 \| good	5.122 \| good	22.481 \| good	37.993 \| good	0.374 \| good	3.103 \| good	0.126 \| good
2026-09-07T18:00:00.000Z	40 \| good	5.181 \| good	22.696 \| good	43.247 \| good	0.363 \| good	2.635 \| good	0.119 \| good
2026-09-07T19:00:00.000Z	44 \| good	4.4 \| good	19.248 \| good	47.118 \| good	0.348 \| good	2.249 \| good	0.115 \| good
2026-09-07T20:00:00.000Z	45 \| good	5.721 \| good	24.875 \| good	49.089 \| good	0.344 \| good	1.929 \| good	0.113 \| good
2026-09-07T21:00:00.000Z	44 \| good	7.017 \| good	30.964 \| good	48.441 \| good	0.352 \| good	1.653 \| good	0.11 \| good
2026-09-07T22:00:00.000Z	45 \| good	7.857 \| good	34.556 \| good	49.052 \| good	0.348 \| good	1.399 \| good	0.108 \| good
2026-09-07T23:00:00.000Z	49 \| good	9.041 \| good	39.922 \| good	52.921 \| good	0.345 \| good	1.271 \| good	0.106 \| good
2026-09-08T00:00:00.000Z	49 \| good	9.487 \| good	42.414 \| good	52.047 \| good	0.398 \| good	1.452 \| good	0.106 \| good
2026-09-08T01:00:00.000Z	49 \| good	8.803 \| good	38.739 \| good	46.595 \| good	0.52 \| good	2.169 \| good	0.111 \| good
2026-09-08T02:00:00.000Z	49 \| good	8.92 \| good	39.066 \| good	39.458 \| good	0.664 \| good	3.553 \| good	0.118 \| good
2026-09-08T03:00:00.000Z	52 \| moderate	9.742 \| good	43.201 \| good	34.016 \| good	0.763 \| good	5.104 \| good	0.128 \| good
2026-09-08T04:00:00.000Z	52 \| moderate	10.116 \| good	44.843 \| good	29.658 \| good	0.826 \| good	6.911 \| good	0.138 \| good
2026-09-08T05:00:00.000Z	49 \| good	9.471 \| good	42.309 \| good	26.168 \| good	0.872 \| good	9.113 \| good	0.15 \| good
2026-09-08T06:00:00.000Z	52 \| moderate	9.685 \| good	43.109 \| good	22.935 \| good	0.918 \| good	11.453 \| good	0.162 \| good
2026-09-08T07:00:00.000Z	49 \| good	9.437 \| good	41.892 \| good	20.77 \| good	0.947 \| good	14.201 \| good	0.177 \| good
2026-09-08T08:00:00.000Z	52 \| moderate	9.767 \| good	43.22 \| good	20.163 \| good	0.933 \| good	15.756 \| good	0.187 \| good
2026-09-08T09:00:00.000Z	52 \| moderate	10.054 \| good	44.797 \| good	20.915 \| good	0.906 \| good	16.33 \| good	0.192 \| good
2026-09-08T10:00:00.000Z	49 \| good	9.373 \| good	41.575 \| good	22.272 \| good	0.841 \| good	16.053 \| good	0.194 \| good
2026-09-08T11:00:00.000Z	52 \| moderate	9.729 \| good	43.428 \| good	24.546 \| good	0.745 \| good	15.324 \| good	0.193 \| good
2026-09-08T12:00:00.000Z	52 \| moderate	9.996 \| good	44.286 \| good	25.158 \| good	0.662 \| good	14.237 \| good	0.19 \| good
2026-09-08T13:00:00.000Z	54 \| moderate	10.569 \| good	47.132 \| good	25.578 \| good	0.613 \| good	12.95 \| good	0.185 \| good
2026-09-08T14:00:00.000Z	56 \| moderate	11.573 \| good	51.446 \| good	26.416 \| good	0.593 \| good	11.051 \| good	0.187 \| good
2026-09-08T15:00:00.000Z	49 \| good	9.109 \| good	40.271 \| good	34.184 \| good	0.653 \| good	8.632 \| good	0.19 \| good
2026-09-08T16:00:00.000Z	38 \| good	6.783 \| good	29.643 \| good	39.866 \| good	0.806 \| good	4.818 \| good	0.146 \| good
2026-09-08T17:00:00.000Z	41 \| good	5.704 \| good	25.016 \| good	43.953 \| good	0.865 \| good	3.48 \| good	0.132 \| good
2026-09-08T18:00:00.000Z	45 \| good	6.053 \| good	26.47 \| good	48.608 \| good	0.882 \| good	2.698 \| good	0.125 \| good
2026-09-08T19:00:00.000Z	50 \| good	8.62 \| good	37.948 \| good	54.474 \| good	0.901 \| good	2.205 \| good	0.122 \| good
2026-09-08T20:00:00.000Z	71 \| moderate	12.07 \| good	54.097 \| good	61.019 \| fine	0.905 \| good	1.904 \| good	0.121 \| good
2026-09-08T21:00:00.000Z	80 \| moderate	13.476 \| fine	60.462 \| fine	64.414 \| fine	0.897 \| good	1.753 \| good	0.121 \| good
2026-09-08T22:00:00.000Z	84 \| moderate	12.789 \| fine	57.345 \| fine	65.2 \| fine	0.903 \| good	1.743 \| good	0.123 \| good
2026-09-08T23:00:00.000Z	77 \| moderate	10.672 \| good	47.154 \| good	62.616 \| fine	0.929 \| good	1.899 \| good	0.125 \| good
2026-09-09T00:00:00.000Z	51 \| moderate	8.492 \| good	37.148 \| good	54.818 \| good	0.987 \| good	2.273 \| good	0.128 \| good
2026-09-09T01:00:00.000Z	43 \| good	6.329 \| good	28.102 \| good	46.368 \| good	1.035 \| good	3.087 \| good	0.132 \| good
2026-09-09T02:00:00.000Z	34 \| good	6.007 \| good	26.495 \| good	37.102 \| good	1.05 \| good	4.502 \| good	0.136 \| good
2026-09-09T03:00:00.000Z	33 \| good	6.494 \| good	28.989 \| good	33.988 \| good	1.031 \| good	6.111 \| good	0.145 \| good
2026-09-09T04:00:00.000Z	38 \| good	7.229 \| good	31.741 \| good	31.458 \| good	1.021 \| good	8.137 \| good	0.155 \| good
2026-09-09T05:00:00.000Z	38 \| good	7.151 \| good	31.602 \| good	27.842 \| good	1.031 \| good	10.508 \| good	0.165 \| good
2026-09-09T06:00:00.000Z	44 \| good	7.988 \| good	35.025 \| good	24.316 \| good	1.051 \| good	11.992 \| good	0.175 \| good
2026-09-09T07:00:00.000Z	44 \| good	8.255 \| good	36.152 \| good	23.509 \| good	1.051 \| good	13.669 \| good	0.187 \| good
2026-09-09T08:00:00.000Z	52 \| moderate	9.518 \| good	42.211 \| good	24.141 \| good	0.996 \| good	14.104 \| good	0.193 \| good
2026-09-09T09:00:00.000Z	52 \| moderate	9.736 \| good	43.361 \| good	26.398 \| good	0.902 \| good	14.363 \| good	0.198 \| good
2026-09-09T10:00:00.000Z	52 \| moderate	10.15 \| good	44.738 \| good	25.678 \| good	0.816 \| good	14.156 \| good	0.199 \| good
2026-09-09T11:00:00.000Z	52 \| moderate	10.232 \| good	45.528 \| good	26.258 \| good	0.751 \| good	13.685 \| good	0.2 \| good
2026-09-09T12:00:00.000Z	64 \| moderate	16.163 \| fine	17.583 \| good	9.633 \| good	0.695 \| good	13.204 \| good	0.201 \| 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?