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

The current PM10 levels in San Marcos, California are 8.909 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 0.3 ppb.

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

The current ozone (O3) levels at San Marcos, California is 35.007 ppm.

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

The current nitrogen dioxide (NO2) levels at San Marcos, California is 2.969 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 2.24 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)

2.67 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

7.83 μg/m³

155

255

425

605+

Ozone (O₃)

38.42 ppb

201

201+

Sulfur Dioxide (SO₂)

0.31 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

3.71 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.28 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

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
2026-10-21T02:00:00.000Z	44 \| good	7.872 \| good	30.294 \| good	44.041 \| good	0.319 \| good	6.645 \| good	0.314 \| good
2026-10-21T03:00:00.000Z	38 \| good	7.028 \| good	30.972 \| good	32.075 \| good	0.546 \| good	12.789 \| good	0.177 \| good
2026-10-21T04:00:00.000Z	38 \| good	7.369 \| good	29.519 \| good	36.264 \| good	0.297 \| good	8.723 \| good	0.233 \| good
2026-10-21T05:00:00.000Z	38 \| good	6.963 \| good	26.641 \| good	33.167 \| good	0.663 \| good	9.893 \| good	0.255 \| good
2026-10-21T06:00:00.000Z	33 \| good	6.317 \| good	31.566 \| good	28.761 \| good	0.389 \| good	6.414 \| good	0.248 \| good
2026-10-21T07:00:00.000Z	33 \| good	5.995 \| good	21.632 \| good	31.046 \| good	0.389 \| good	5.529 \| good	0.248 \| good
2026-10-21T08:00:00.000Z	33 \| good	6.475 \| good	24.321 \| good	21.059 \| good	0.359 \| good	6.81 \| good	0.27 \| good
2026-10-21T09:00:00.000Z	33 \| good	5.894 \| good	21.052 \| good	19.176 \| good	0.437 \| good	13.362 \| good	0.233 \| good
2026-10-21T10:00:00.000Z	33 \| good	5.775 \| good	21.307 \| good	13.593 \| good	0.357 \| good	9.759 \| good	0.244 \| good
2026-10-21T11:00:00.000Z	38 \| good	6.506 \| good	22.616 \| good	14.165 \| good	0.332 \| good	18.174 \| good	0.282 \| good
2026-10-21T12:00:00.000Z	38 \| good	6.853 \| good	22.514 \| good	18.847 \| good	0.418 \| good	13.364 \| good	0.307 \| good
2026-10-21T13:00:00.000Z	33 \| good	5.766 \| good	19.782 \| good	19.988 \| good	0.419 \| good	16.02 \| good	0.307 \| good
2026-10-21T14:00:00.000Z	38 \| good	6.598 \| good	26.364 \| good	13.502 \| good	0.409 \| good	18.264 \| good	0.513 \| good
2026-10-21T15:00:00.000Z	49 \| good	9.174 \| good	39.753 \| good	15.305 \| good	0.525 \| good	13.101 \| good	0.576 \| good
2026-10-21T16:00:00.000Z	49 \| good	9.106 \| good	40.537 \| good	19.162 \| good	0.517 \| good	13.614 \| good	0.551 \| good
2026-10-21T17:00:00.000Z	70 \| moderate	7.366 \| good	93.582 \| fine	25.46 \| good	0.511 \| good	21.566 \| good	0.441 \| good
2026-10-21T18:00:00.000Z	65 \| moderate	14.319 \| fine	82.917 \| fine	30.215 \| good	0.342 \| good	25.445 \| good	0.36 \| good
2026-10-21T19:00:00.000Z	54 \| moderate	10.987 \| good	32.578 \| good	29.444 \| good	0.438 \| good	14.128 \| good	0.333 \| good
2026-10-21T20:00:00.000Z	52 \| moderate	9.889 \| good	45.559 \| good	38.955 \| good	0.414 \| good	9.461 \| good	0.294 \| good
2026-10-21T21:00:00.000Z	44 \| good	8.166 \| good	28.003 \| good	44.963 \| good	0.509 \| good	9.563 \| good	0.312 \| good
2026-10-21T22:00:00.000Z	40 \| good	7.348 \| good	40.559 \| good	42.513 \| good	0.489 \| good	8.938 \| good	0.272 \| good
2026-10-21T23:00:00.000Z	44 \| good	6.555 \| good	48.181 \| good	44.694 \| good	0.486 \| good	7.397 \| good	0.304 \| good
2026-10-22T00:00:00.000Z	43 \| good	6.777 \| good	37.398 \| good	45.714 \| good	0.482 \| good	6.978 \| good	0.31 \| good
2026-10-22T01:00:00.000Z	46 \| good	7.322 \| good	29.977 \| good	50.404 \| good	0.44 \| good	10.99 \| good	0.354 \| good
2026-10-22T02:00:00.000Z	34 \| good	6.349 \| good	24.62 \| good	37.31 \| good	0.454 \| good	13.431 \| good	0.359 \| good
2026-10-22T03:00:00.000Z	33 \| good	5.016 \| good	21.498 \| good	36.237 \| good	0.426 \| good	5.375 \| good	0.126 \| good
2026-10-22T04:00:00.000Z	33 \| good	5.792 \| good	16.987 \| good	31.014 \| good	0.398 \| good	10.524 \| good	0.261 \| good
2026-10-22T05:00:00.000Z	33 \| good	5.503 \| good	19.623 \| good	31.426 \| good	0.582 \| good	5.174 \| good	0.244 \| good
2026-10-22T06:00:00.000Z	27 \| good	4.861 \| good	12.099 \| good	29.021 \| good	0.256 \| good	5.07 \| good	0.249 \| good
2026-10-22T07:00:00.000Z	27 \| good	4.799 \| good	13.104 \| good	27.243 \| good	0.256 \| good	9.722 \| good	0.249 \| good
2026-10-22T08:00:00.000Z	27 \| good	3.28 \| good	8.634 \| good	29.407 \| good	0.266 \| good	3.722 \| good	0.181 \| good
2026-10-22T09:00:00.000Z	29 \| good	2.866 \| good	8.231 \| good	31.002 \| good	0.328 \| good	6.06 \| good	0.144 \| good
2026-10-22T10:00:00.000Z	28 \| good	3.675 \| good	25.892 \| good	30.112 \| good	0.265 \| good	2.08 \| good	0.144 \| good
2026-10-22T11:00:00.000Z	25 \| good	4.107 \| good	20.842 \| good	27.429 \| good	0.27 \| good	9.144 \| good	0.215 \| good
2026-10-22T12:00:00.000Z	21 \| good	2.129 \| good	5.655 \| good	23.082 \| good	0.265 \| good	11.107 \| good	0.261 \| good
2026-10-22T13:00:00.000Z	127 \| sensitive	2.216 \| good	206.941 \| moderate	24.331 \| good	0.265 \| good	11.786 \| good	0.261 \| good
2026-10-22T14:00:00.000Z	26 \| good	2.692 \| good	9.036 \| good	27.739 \| good	0.265 \| good	14.202 \| good	0.384 \| good
2026-10-22T15:00:00.000Z	28 \| good	2.512 \| good	11.303 \| good	29.555 \| good	0.276 \| good	17.455 \| good	0.46 \| good
2026-10-22T16:00:00.000Z	31 \| good	1.831 \| good	5.613 \| good	32.613 \| good	0.302 \| good	18.675 \| good	0.464 \| good
2026-10-22T17:00:00.000Z	35 \| good	2.217 \| good	6.906 \| good	37.604 \| good	0.258 \| good	12.095 \| good	0.32 \| good
2026-10-22T18:00:00.000Z	35 \| good	2.751 \| good	10.576 \| good	37.896 \| good	0.238 \| good	8.828 \| good	0.235 \| good
2026-10-22T19:00:00.000Z	33 \| good	2.12 \| good	11.421 \| good	36.391 \| good	0.188 \| good	2.46 \| good	0.218 \| good
2026-10-22T20:00:00.000Z	37 \| good	2.018 \| good	18.231 \| good	40.472 \| good	0.219 \| good	1.661 \| good	0.203 \| good
2026-10-22T21:00:00.000Z	38 \| good	2.091 \| good	9.489 \| good	40.78 \| good	0.21 \| good	3.046 \| good	0.221 \| good
2026-10-22T22:00:00.000Z	36 \| good	2.305 \| good	7.445 \| good	39.139 \| good	0.272 \| good	4.209 \| good	0.244 \| good
2026-10-22T23:00:00.000Z	35 \| good	2.197 \| good	8.499 \| good	38.357 \| good	0.272 \| good	3.236 \| good	0.268 \| good
2026-10-23T00:00:00.000Z	32 \| good	2.24 \| good	8.909 \| good	35.007 \| good	0.3 \| good	2.969 \| good	0.226 \| good
2026-10-23T01:00:00.000Z	35 \| good	2.674 \| good	7.828 \| good	38.418 \| good	0.307 \| good	3.711 \| good	0.276 \| good
2026-10-23T01:00:00.000Z	35 \| good	2.674 \| good	7.828 \| good	38.418 \| good	0.307 \| good	3.711 \| good	0.276 \| good
2026-10-23T01:00:00.000Z	35 \| good	4.57 \| good	19.659 \| good	37.633 \| good	0.249 \| good	3.258 \| good	0.145 \| good
2026-10-23T02:00:00.000Z	33 \| good	5.215 \| good	22.706 \| good	36.28 \| good	0.321 \| good	9.045 \| good	0.175 \| good
2026-10-23T03:00:00.000Z	31 \| good	4.453 \| good	19.554 \| good	33.772 \| good	0.455 \| good	16.824 \| good	0.213 \| good
2026-10-23T04:00:00.000Z	30 \| good	3.308 \| good	14.299 \| good	32.309 \| good	0.504 \| good	21.752 \| good	0.241 \| good
2026-10-23T05:00:00.000Z	30 \| good	2.958 \| good	11.856 \| good	31.781 \| good	0.511 \| good	22.302 \| good	0.252 \| good
2026-10-23T06:00:00.000Z	28 \| good	2.568 \| good	10.379 \| good	29.619 \| good	0.48 \| good	21.392 \| good	0.251 \| good
2026-10-23T07:00:00.000Z	26 \| good	2.507 \| good	9.928 \| good	28.168 \| good	0.426 \| good	19.981 \| good	0.241 \| good
2026-10-23T08:00:00.000Z	25 \| good	2.732 \| good	10.917 \| good	27.095 \| good	0.388 \| good	18.254 \| good	0.229 \| good
2026-10-23T09:00:00.000Z	25 \| good	2.661 \| good	10.737 \| good	27.142 \| good	0.373 \| good	16.321 \| good	0.218 \| good
2026-10-23T10:00:00.000Z	24 \| good	2.82 \| good	11.523 \| good	26.187 \| good	0.363 \| good	14.642 \| good	0.21 \| good
2026-10-23T11:00:00.000Z	23 \| good	3.064 \| good	13.049 \| good	25.075 \| good	0.359 \| good	13.367 \| good	0.205 \| good
2026-10-23T12:00:00.000Z	20 \| good	3.293 \| good	14.174 \| good	22.025 \| good	0.358 \| good	12.199 \| good	0.201 \| good
2026-10-23T13:00:00.000Z	21 \| good	3.151 \| good	13.498 \| good	23.236 \| good	0.368 \| good	11.468 \| good	0.198 \| good
2026-10-23T14:00:00.000Z	19 \| good	3.308 \| good	14.505 \| good	20.787 \| good	0.394 \| good	12.017 \| good	0.204 \| good
2026-10-23T15:00:00.000Z	23 \| good	3.672 \| good	15.596 \| good	25.151 \| good	0.441 \| good	10.86 \| good	0.217 \| good
2026-10-23T16:00:00.000Z	29 \| good	3.166 \| good	13.654 \| good	30.623 \| good	0.573 \| good	8.183 \| good	0.197 \| good
2026-10-23T17:00:00.000Z	32 \| good	3.556 \| good	15.424 \| good	35.161 \| good	0.579 \| good	3.759 \| good	0.148 \| good
2026-10-23T18:00:00.000Z	36 \| good	3.28 \| good	14.303 \| good	39.388 \| good	0.471 \| good	2.492 \| good	0.133 \| good
2026-10-23T19:00:00.000Z	41 \| good	4.017 \| good	17.542 \| good	43.991 \| good	0.39 \| good	1.813 \| good	0.126 \| good
2026-10-23T20:00:00.000Z	43 \| good	4.171 \| good	18.45 \| good	46.44 \| good	0.351 \| good	1.39 \| good	0.122 \| good
2026-10-23T21:00:00.000Z	42 \| good	4.305 \| good	18.72 \| good	44.909 \| good	0.332 \| good	1.166 \| good	0.12 \| good
2026-10-23T22:00:00.000Z	41 \| good	3.919 \| good	17.17 \| good	44.216 \| good	0.337 \| good	1.074 \| good	0.119 \| good
2026-10-23T23:00:00.000Z	41 \| good	4.472 \| good	19.396 \| good	43.894 \| good	0.382 \| good	1.262 \| good	0.12 \| good
2026-10-24T00:00:00.000Z	43 \| good	4.565 \| good	19.8 \| good	45.716 \| good	0.464 \| good	1.803 \| good	0.124 \| good
2026-10-24T01:00:00.000Z	42 \| good	5.296 \| good	22.854 \| good	45.127 \| good	0.574 \| good	3.212 \| good	0.131 \| good
2026-10-24T02:00:00.000Z	44 \| good	6.141 \| good	27.231 \| good	46.794 \| good	0.692 \| good	11.739 \| good	0.174 \| good
2026-10-24T03:00:00.000Z	40 \| good	4.956 \| good	21.594 \| good	42.838 \| good	0.803 \| good	19.546 \| good	0.213 \| good
2026-10-24T04:00:00.000Z	35 \| good	4.942 \| good	21.489 \| good	38.285 \| good	0.848 \| good	25.269 \| good	0.243 \| good
2026-10-24T05:00:00.000Z	34 \| good	4.826 \| good	21.099 \| good	36.925 \| good	0.785 \| good	26.301 \| good	0.267 \| good
2026-10-24T06:00:00.000Z	31 \| good	4.084 \| good	17.949 \| good	33.692 \| good	0.664 \| good	23.335 \| good	0.28 \| good
2026-10-24T07:00:00.000Z	29 \| good	4.297 \| good	18.79 \| good	30.862 \| good	0.515 \| good	20.772 \| good	0.283 \| good
2026-10-24T08:00:00.000Z	27 \| good	4.502 \| good	19.58 \| good	28.464 \| good	0.383 \| good	19.009 \| good	0.274 \| good
2026-10-24T09:00:00.000Z	27 \| good	4.47 \| good	19.577 \| good	28.985 \| good	0.289 \| good	17.677 \| good	0.259 \| good
2026-10-24T10:00:00.000Z	27 \| good	4.56 \| good	20.071 \| good	27.956 \| good	0.227 \| good	16.525 \| good	0.244 \| good
2026-10-24T11:00:00.000Z	25 \| good	4.441 \| good	19.523 \| good	26.688 \| good	0.185 \| good	15.372 \| good	0.232 \| good
2026-10-24T12:00:00.000Z	27 \| good	4.553 \| good	19.92 \| good	25.563 \| good	0.158 \| good	13.971 \| good	0.224 \| good
2026-10-24T13:00:00.000Z	23 \| good	4.453 \| good	19.617 \| good	25.255 \| good	0.147 \| good	12.83 \| good	0.22 \| good
2026-10-24T14:00:00.000Z	25 \| good	3.961 \| good	17.446 \| good	27.489 \| good	0.188 \| good	11.516 \| good	0.226 \| good
2026-10-24T15:00:00.000Z	28 \| good	3.884 \| good	17.019 \| good	30.206 \| good	0.247 \| good	9.044 \| good	0.245 \| good
2026-10-24T16:00:00.000Z	35 \| good	4.147 \| good	18.049 \| good	37.731 \| good	0.336 \| good	8.925 \| good	0.22 \| good
2026-10-24T17:00:00.000Z	40 \| good	5.413 \| good	23.275 \| good	43.002 \| good	0.905 \| good	3.82 \| good	0.153 \| good
2026-10-24T18:00:00.000Z	45 \| good	6.342 \| good	27.986 \| good	48.527 \| good	1.225 \| good	2.699 \| good	0.148 \| good
2026-10-24T19:00:00.000Z	49 \| good	7.159 \| good	31.521 \| good	53.209 \| good	1.237 \| good	2.012 \| good	0.146 \| good
2026-10-24T20:00:00.000Z	51 \| moderate	7.499 \| good	32.972 \| good	54.837 \| good	1.189 \| good	1.581 \| good	0.145 \| good
2026-10-24T21:00:00.000Z	51 \| moderate	6.883 \| good	30.527 \| good	54.531 \| good	1.151 \| good	1.331 \| good	0.145 \| good
2026-10-24T22:00:00.000Z	54 \| moderate	7.221 \| good	31.704 \| good	55.512 \| fine	1.129 \| good	1.226 \| good	0.145 \| good
2026-10-24T23:00:00.000Z	61 \| moderate	9.113 \| good	40.778 \| good	57.805 \| fine	1.116 \| good	1.34 \| good	0.144 \| good
2026-10-25T00:00:00.000Z	67 \| moderate	9.414 \| good	41.986 \| good	59.674 \| fine	1.118 \| good	1.8 \| good	0.144 \| good

San Marcos

Empower business decisions with accurate air quality data

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

0.23ppm

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 01:00:00 on 2026-10-22.

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 12:00:00 on 2026-10-22.

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

The real-time air quality index in San Marcos, California is 32, currently categorized as Good.

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

The most common pollutant in San Marcos, California is O3.

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 2.24 μg/m³.

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

The current PM₁₀ levels in San Marcos, California are 8.909 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 0.226 ppm.

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

The current sulfur dioxide (SO₂) levels in San Marcos, California are 0.3 ppb.

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

The current ozone (O₃) levels at San Marcos, California is 35.007 ppm.

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

The current nitrogen dioxide (NO₂) levels at San Marcos, California is 2.969 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-10-21T02:00:00.000Z	44 \| good	7.872 \| good	30.294 \| good	44.041 \| good	0.319 \| good	6.645 \| good	0.314 \| good
2026-10-21T03:00:00.000Z	38 \| good	7.028 \| good	30.972 \| good	32.075 \| good	0.546 \| good	12.789 \| good	0.177 \| good
2026-10-21T04:00:00.000Z	38 \| good	7.369 \| good	29.519 \| good	36.264 \| good	0.297 \| good	8.723 \| good	0.233 \| good
2026-10-21T05:00:00.000Z	38 \| good	6.963 \| good	26.641 \| good	33.167 \| good	0.663 \| good	9.893 \| good	0.255 \| good
2026-10-21T06:00:00.000Z	33 \| good	6.317 \| good	31.566 \| good	28.761 \| good	0.389 \| good	6.414 \| good	0.248 \| good
2026-10-21T07:00:00.000Z	33 \| good	5.995 \| good	21.632 \| good	31.046 \| good	0.389 \| good	5.529 \| good	0.248 \| good
2026-10-21T08:00:00.000Z	33 \| good	6.475 \| good	24.321 \| good	21.059 \| good	0.359 \| good	6.81 \| good	0.27 \| good
2026-10-21T09:00:00.000Z	33 \| good	5.894 \| good	21.052 \| good	19.176 \| good	0.437 \| good	13.362 \| good	0.233 \| good
2026-10-21T10:00:00.000Z	33 \| good	5.775 \| good	21.307 \| good	13.593 \| good	0.357 \| good	9.759 \| good	0.244 \| good
2026-10-21T11:00:00.000Z	38 \| good	6.506 \| good	22.616 \| good	14.165 \| good	0.332 \| good	18.174 \| good	0.282 \| good
2026-10-21T12:00:00.000Z	38 \| good	6.853 \| good	22.514 \| good	18.847 \| good	0.418 \| good	13.364 \| good	0.307 \| good
2026-10-21T13:00:00.000Z	33 \| good	5.766 \| good	19.782 \| good	19.988 \| good	0.419 \| good	16.02 \| good	0.307 \| good
2026-10-21T14:00:00.000Z	38 \| good	6.598 \| good	26.364 \| good	13.502 \| good	0.409 \| good	18.264 \| good	0.513 \| good
2026-10-21T15:00:00.000Z	49 \| good	9.174 \| good	39.753 \| good	15.305 \| good	0.525 \| good	13.101 \| good	0.576 \| good
2026-10-21T16:00:00.000Z	49 \| good	9.106 \| good	40.537 \| good	19.162 \| good	0.517 \| good	13.614 \| good	0.551 \| good
2026-10-21T17:00:00.000Z	70 \| moderate	7.366 \| good	93.582 \| fine	25.46 \| good	0.511 \| good	21.566 \| good	0.441 \| good
2026-10-21T18:00:00.000Z	65 \| moderate	14.319 \| fine	82.917 \| fine	30.215 \| good	0.342 \| good	25.445 \| good	0.36 \| good
2026-10-21T19:00:00.000Z	54 \| moderate	10.987 \| good	32.578 \| good	29.444 \| good	0.438 \| good	14.128 \| good	0.333 \| good
2026-10-21T20:00:00.000Z	52 \| moderate	9.889 \| good	45.559 \| good	38.955 \| good	0.414 \| good	9.461 \| good	0.294 \| good
2026-10-21T21:00:00.000Z	44 \| good	8.166 \| good	28.003 \| good	44.963 \| good	0.509 \| good	9.563 \| good	0.312 \| good
2026-10-21T22:00:00.000Z	40 \| good	7.348 \| good	40.559 \| good	42.513 \| good	0.489 \| good	8.938 \| good	0.272 \| good
2026-10-21T23:00:00.000Z	44 \| good	6.555 \| good	48.181 \| good	44.694 \| good	0.486 \| good	7.397 \| good	0.304 \| good
2026-10-22T00:00:00.000Z	43 \| good	6.777 \| good	37.398 \| good	45.714 \| good	0.482 \| good	6.978 \| good	0.31 \| good
2026-10-22T01:00:00.000Z	46 \| good	7.322 \| good	29.977 \| good	50.404 \| good	0.44 \| good	10.99 \| good	0.354 \| good
2026-10-22T02:00:00.000Z	34 \| good	6.349 \| good	24.62 \| good	37.31 \| good	0.454 \| good	13.431 \| good	0.359 \| good
2026-10-22T03:00:00.000Z	33 \| good	5.016 \| good	21.498 \| good	36.237 \| good	0.426 \| good	5.375 \| good	0.126 \| good
2026-10-22T04:00:00.000Z	33 \| good	5.792 \| good	16.987 \| good	31.014 \| good	0.398 \| good	10.524 \| good	0.261 \| good
2026-10-22T05:00:00.000Z	33 \| good	5.503 \| good	19.623 \| good	31.426 \| good	0.582 \| good	5.174 \| good	0.244 \| good
2026-10-22T06:00:00.000Z	27 \| good	4.861 \| good	12.099 \| good	29.021 \| good	0.256 \| good	5.07 \| good	0.249 \| good
2026-10-22T07:00:00.000Z	27 \| good	4.799 \| good	13.104 \| good	27.243 \| good	0.256 \| good	9.722 \| good	0.249 \| good
2026-10-22T08:00:00.000Z	27 \| good	3.28 \| good	8.634 \| good	29.407 \| good	0.266 \| good	3.722 \| good	0.181 \| good
2026-10-22T09:00:00.000Z	29 \| good	2.866 \| good	8.231 \| good	31.002 \| good	0.328 \| good	6.06 \| good	0.144 \| good
2026-10-22T10:00:00.000Z	28 \| good	3.675 \| good	25.892 \| good	30.112 \| good	0.265 \| good	2.08 \| good	0.144 \| good
2026-10-22T11:00:00.000Z	25 \| good	4.107 \| good	20.842 \| good	27.429 \| good	0.27 \| good	9.144 \| good	0.215 \| good
2026-10-22T12:00:00.000Z	21 \| good	2.129 \| good	5.655 \| good	23.082 \| good	0.265 \| good	11.107 \| good	0.261 \| good
2026-10-22T13:00:00.000Z	127 \| sensitive	2.216 \| good	206.941 \| moderate	24.331 \| good	0.265 \| good	11.786 \| good	0.261 \| good
2026-10-22T14:00:00.000Z	26 \| good	2.692 \| good	9.036 \| good	27.739 \| good	0.265 \| good	14.202 \| good	0.384 \| good
2026-10-22T15:00:00.000Z	28 \| good	2.512 \| good	11.303 \| good	29.555 \| good	0.276 \| good	17.455 \| good	0.46 \| good
2026-10-22T16:00:00.000Z	31 \| good	1.831 \| good	5.613 \| good	32.613 \| good	0.302 \| good	18.675 \| good	0.464 \| good
2026-10-22T17:00:00.000Z	35 \| good	2.217 \| good	6.906 \| good	37.604 \| good	0.258 \| good	12.095 \| good	0.32 \| good
2026-10-22T18:00:00.000Z	35 \| good	2.751 \| good	10.576 \| good	37.896 \| good	0.238 \| good	8.828 \| good	0.235 \| good
2026-10-22T19:00:00.000Z	33 \| good	2.12 \| good	11.421 \| good	36.391 \| good	0.188 \| good	2.46 \| good	0.218 \| good
2026-10-22T20:00:00.000Z	37 \| good	2.018 \| good	18.231 \| good	40.472 \| good	0.219 \| good	1.661 \| good	0.203 \| good
2026-10-22T21:00:00.000Z	38 \| good	2.091 \| good	9.489 \| good	40.78 \| good	0.21 \| good	3.046 \| good	0.221 \| good
2026-10-22T22:00:00.000Z	36 \| good	2.305 \| good	7.445 \| good	39.139 \| good	0.272 \| good	4.209 \| good	0.244 \| good
2026-10-22T23:00:00.000Z	35 \| good	2.197 \| good	8.499 \| good	38.357 \| good	0.272 \| good	3.236 \| good	0.268 \| good
2026-10-23T00:00:00.000Z	32 \| good	2.24 \| good	8.909 \| good	35.007 \| good	0.3 \| good	2.969 \| good	0.226 \| good
2026-10-23T01:00:00.000Z	35 \| good	2.674 \| good	7.828 \| good	38.418 \| good	0.307 \| good	3.711 \| good	0.276 \| good
2026-10-23T01:00:00.000Z	35 \| good	2.674 \| good	7.828 \| good	38.418 \| good	0.307 \| good	3.711 \| good	0.276 \| good
2026-10-23T01:00:00.000Z	35 \| good	4.57 \| good	19.659 \| good	37.633 \| good	0.249 \| good	3.258 \| good	0.145 \| good
2026-10-23T02:00:00.000Z	33 \| good	5.215 \| good	22.706 \| good	36.28 \| good	0.321 \| good	9.045 \| good	0.175 \| good
2026-10-23T03:00:00.000Z	31 \| good	4.453 \| good	19.554 \| good	33.772 \| good	0.455 \| good	16.824 \| good	0.213 \| good
2026-10-23T04:00:00.000Z	30 \| good	3.308 \| good	14.299 \| good	32.309 \| good	0.504 \| good	21.752 \| good	0.241 \| good
2026-10-23T05:00:00.000Z	30 \| good	2.958 \| good	11.856 \| good	31.781 \| good	0.511 \| good	22.302 \| good	0.252 \| good
2026-10-23T06:00:00.000Z	28 \| good	2.568 \| good	10.379 \| good	29.619 \| good	0.48 \| good	21.392 \| good	0.251 \| good
2026-10-23T07:00:00.000Z	26 \| good	2.507 \| good	9.928 \| good	28.168 \| good	0.426 \| good	19.981 \| good	0.241 \| good
2026-10-23T08:00:00.000Z	25 \| good	2.732 \| good	10.917 \| good	27.095 \| good	0.388 \| good	18.254 \| good	0.229 \| good
2026-10-23T09:00:00.000Z	25 \| good	2.661 \| good	10.737 \| good	27.142 \| good	0.373 \| good	16.321 \| good	0.218 \| good
2026-10-23T10:00:00.000Z	24 \| good	2.82 \| good	11.523 \| good	26.187 \| good	0.363 \| good	14.642 \| good	0.21 \| good
2026-10-23T11:00:00.000Z	23 \| good	3.064 \| good	13.049 \| good	25.075 \| good	0.359 \| good	13.367 \| good	0.205 \| good
2026-10-23T12:00:00.000Z	20 \| good	3.293 \| good	14.174 \| good	22.025 \| good	0.358 \| good	12.199 \| good	0.201 \| good
2026-10-23T13:00:00.000Z	21 \| good	3.151 \| good	13.498 \| good	23.236 \| good	0.368 \| good	11.468 \| good	0.198 \| good
2026-10-23T14:00:00.000Z	19 \| good	3.308 \| good	14.505 \| good	20.787 \| good	0.394 \| good	12.017 \| good	0.204 \| good
2026-10-23T15:00:00.000Z	23 \| good	3.672 \| good	15.596 \| good	25.151 \| good	0.441 \| good	10.86 \| good	0.217 \| good
2026-10-23T16:00:00.000Z	29 \| good	3.166 \| good	13.654 \| good	30.623 \| good	0.573 \| good	8.183 \| good	0.197 \| good
2026-10-23T17:00:00.000Z	32 \| good	3.556 \| good	15.424 \| good	35.161 \| good	0.579 \| good	3.759 \| good	0.148 \| good
2026-10-23T18:00:00.000Z	36 \| good	3.28 \| good	14.303 \| good	39.388 \| good	0.471 \| good	2.492 \| good	0.133 \| good
2026-10-23T19:00:00.000Z	41 \| good	4.017 \| good	17.542 \| good	43.991 \| good	0.39 \| good	1.813 \| good	0.126 \| good
2026-10-23T20:00:00.000Z	43 \| good	4.171 \| good	18.45 \| good	46.44 \| good	0.351 \| good	1.39 \| good	0.122 \| good
2026-10-23T21:00:00.000Z	42 \| good	4.305 \| good	18.72 \| good	44.909 \| good	0.332 \| good	1.166 \| good	0.12 \| good
2026-10-23T22:00:00.000Z	41 \| good	3.919 \| good	17.17 \| good	44.216 \| good	0.337 \| good	1.074 \| good	0.119 \| good
2026-10-23T23:00:00.000Z	41 \| good	4.472 \| good	19.396 \| good	43.894 \| good	0.382 \| good	1.262 \| good	0.12 \| good
2026-10-24T00:00:00.000Z	43 \| good	4.565 \| good	19.8 \| good	45.716 \| good	0.464 \| good	1.803 \| good	0.124 \| good
2026-10-24T01:00:00.000Z	42 \| good	5.296 \| good	22.854 \| good	45.127 \| good	0.574 \| good	3.212 \| good	0.131 \| good
2026-10-24T02:00:00.000Z	44 \| good	6.141 \| good	27.231 \| good	46.794 \| good	0.692 \| good	11.739 \| good	0.174 \| good
2026-10-24T03:00:00.000Z	40 \| good	4.956 \| good	21.594 \| good	42.838 \| good	0.803 \| good	19.546 \| good	0.213 \| good
2026-10-24T04:00:00.000Z	35 \| good	4.942 \| good	21.489 \| good	38.285 \| good	0.848 \| good	25.269 \| good	0.243 \| good
2026-10-24T05:00:00.000Z	34 \| good	4.826 \| good	21.099 \| good	36.925 \| good	0.785 \| good	26.301 \| good	0.267 \| good
2026-10-24T06:00:00.000Z	31 \| good	4.084 \| good	17.949 \| good	33.692 \| good	0.664 \| good	23.335 \| good	0.28 \| good
2026-10-24T07:00:00.000Z	29 \| good	4.297 \| good	18.79 \| good	30.862 \| good	0.515 \| good	20.772 \| good	0.283 \| good
2026-10-24T08:00:00.000Z	27 \| good	4.502 \| good	19.58 \| good	28.464 \| good	0.383 \| good	19.009 \| good	0.274 \| good
2026-10-24T09:00:00.000Z	27 \| good	4.47 \| good	19.577 \| good	28.985 \| good	0.289 \| good	17.677 \| good	0.259 \| good
2026-10-24T10:00:00.000Z	27 \| good	4.56 \| good	20.071 \| good	27.956 \| good	0.227 \| good	16.525 \| good	0.244 \| good
2026-10-24T11:00:00.000Z	25 \| good	4.441 \| good	19.523 \| good	26.688 \| good	0.185 \| good	15.372 \| good	0.232 \| good
2026-10-24T12:00:00.000Z	27 \| good	4.553 \| good	19.92 \| good	25.563 \| good	0.158 \| good	13.971 \| good	0.224 \| good
2026-10-24T13:00:00.000Z	23 \| good	4.453 \| good	19.617 \| good	25.255 \| good	0.147 \| good	12.83 \| good	0.22 \| good
2026-10-24T14:00:00.000Z	25 \| good	3.961 \| good	17.446 \| good	27.489 \| good	0.188 \| good	11.516 \| good	0.226 \| good
2026-10-24T15:00:00.000Z	28 \| good	3.884 \| good	17.019 \| good	30.206 \| good	0.247 \| good	9.044 \| good	0.245 \| good
2026-10-24T16:00:00.000Z	35 \| good	4.147 \| good	18.049 \| good	37.731 \| good	0.336 \| good	8.925 \| good	0.22 \| good
2026-10-24T17:00:00.000Z	40 \| good	5.413 \| good	23.275 \| good	43.002 \| good	0.905 \| good	3.82 \| good	0.153 \| good
2026-10-24T18:00:00.000Z	45 \| good	6.342 \| good	27.986 \| good	48.527 \| good	1.225 \| good	2.699 \| good	0.148 \| good
2026-10-24T19:00:00.000Z	49 \| good	7.159 \| good	31.521 \| good	53.209 \| good	1.237 \| good	2.012 \| good	0.146 \| good
2026-10-24T20:00:00.000Z	51 \| moderate	7.499 \| good	32.972 \| good	54.837 \| good	1.189 \| good	1.581 \| good	0.145 \| good
2026-10-24T21:00:00.000Z	51 \| moderate	6.883 \| good	30.527 \| good	54.531 \| good	1.151 \| good	1.331 \| good	0.145 \| good
2026-10-24T22:00:00.000Z	54 \| moderate	7.221 \| good	31.704 \| good	55.512 \| fine	1.129 \| good	1.226 \| good	0.145 \| good
2026-10-24T23:00:00.000Z	61 \| moderate	9.113 \| good	40.778 \| good	57.805 \| fine	1.116 \| good	1.34 \| good	0.144 \| good
2026-10-25T00:00:00.000Z	67 \| moderate	9.414 \| good	41.986 \| good	59.674 \| fine	1.118 \| good	1.8 \| good	0.144 \| 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?