What is the current concentration of PM10 in San Mateo, California?

The current PM10 concentration at San Mateo, California is 17.853 μg/m3.

What is the current concentration of sulfur dioxide (SO2) in San Mateo, California?

The current sulfur dioxide (SO2) concentration at San Mateo, California is 0.719 ppb.

What is the current concentration of ozone (O3) in San Mateo, California?

The current ozone (O3) concentration at San Mateo, California is 17.842 ppm.

What is the current concentration of nitrogen dioxide (NO2) in San Mateo, California?

The current nitrogen dioxide (NO2) concentration at San Mateo, California is 4.936 ppb.

San Mateo, California live air quality index now

Name: Live air pollution levels in San Mateo, California today
Creator: Ambee

Stay updated with real-time air quality in San Mateo, 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 Mateo, California

Last updated: ... (Local time)

Major air pollutants in San Mateo, California

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

4.37 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

19.14 μg/m³

155

255

425

605+

Ozone (O₃)

18.87 ppb

201

201+

Sulfur Dioxide (SO₂)

0.67 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

4.54 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.32 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

San Mateo, California

Get Live Pollen Counts

San Mateo, California

Scroll To Air Quality Map

Track live San Mateo, California air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-07-28T20:00:00.000Z	22 \| good	4.266 \| good	19.885 \| good	17.797 \| good	0.724 \| good	3.604 \| good	0.34 \| good
2025-07-28T21:00:00.000Z	22 \| good	4.365 \| good	19.137 \| good	19.036 \| good	0.765 \| good	3.625 \| good	0.34 \| good
2025-07-28T22:00:00.000Z	22 \| good	3.548 \| good	14.529 \| good	20.301 \| good	0.726 \| good	3.462 \| good	0.318 \| good
2025-07-28T23:00:00.000Z	38 \| good	6.963 \| good	22.085 \| good	23.01 \| good	0.496 \| good	3.151 \| good	0.318 \| good
2025-07-29T00:00:00.000Z	33 \| good	6.149 \| good	27.072 \| good	25.465 \| good	0.533 \| good	3.311 \| good	0.318 \| good
2025-07-29T01:00:00.000Z	33 \| good	5.7 \| good	28.094 \| good	24.521 \| good	0.537 \| good	3.518 \| good	0.318 \| good
2025-07-29T02:00:00.000Z	25 \| good	4.294 \| good	21.742 \| good	27.066 \| good	0.504 \| good	3.356 \| good	0.302 \| good
2025-07-29T03:00:00.000Z	33 \| good	6.394 \| good	20.192 \| good	28.12 \| good	0.478 \| good	4.287 \| good	0.302 \| good
2025-07-29T04:00:00.000Z	25 \| good	4.38 \| good	13.249 \| good	26.669 \| good	0.721 \| good	2.91 \| good	0.318 \| good
2025-07-29T05:00:00.000Z	24 \| good	2.361 \| good	19.934 \| good	26.261 \| good	0.713 \| good	3.116 \| good	0.362 \| good
2025-07-29T06:00:00.000Z	25 \| good	3.499 \| good	21.257 \| good	27.481 \| good	0.705 \| good	2.638 \| good	0.362 \| good
2025-07-29T07:00:00.000Z	23 \| good	3.836 \| good	15.76 \| good	24.51 \| good	0.72 \| good	2.01 \| good	0.318 \| good
2025-07-29T08:00:00.000Z	22 \| good	3.804 \| good	14.288 \| good	21.25 \| good	0.718 \| good	1.945 \| good	0.318 \| good
2025-07-29T09:00:00.000Z	22 \| good	3.993 \| good	17.942 \| good	18.387 \| good	0.721 \| good	1.337 \| good	0.302 \| good
2025-07-29T10:00:00.000Z	22 \| good	4.135 \| good	9.028 \| good	17.391 \| good	0.654 \| good	1.381 \| good	0.28 \| good
2025-07-29T11:00:00.000Z	16 \| good	3.196 \| good	6.5 \| good	16.578 \| good	0.648 \| good	1.378 \| good	0.28 \| good
2025-07-29T12:00:00.000Z	27 \| good	4.505 \| good	17.674 \| good	16.032 \| good	0.65 \| good	1.502 \| good	0.28 \| good
2025-07-29T13:00:00.000Z	22 \| good	4.133 \| good	14.725 \| good	16.8 \| good	0.565 \| good	4.102 \| good	0.318 \| good
2025-07-29T14:00:00.000Z	22 \| good	3.613 \| good	13.509 \| good	10.451 \| good	0.277 \| good	4.793 \| good	0.34 \| good
2025-07-29T15:00:00.000Z	27 \| good	4.987 \| good	21.418 \| good	13.375 \| good	0.529 \| good	4.975 \| good	0.378 \| good
2025-07-29T16:00:00.000Z	24 \| good	3.709 \| good	25.538 \| good	13.362 \| good	0.293 \| good	5.566 \| good	0.337 \| good
2025-07-29T17:00:00.000Z	33 \| good	6.146 \| good	33.334 \| good	13.552 \| good	0.308 \| good	5.325 \| good	0.356 \| good
2025-07-29T18:00:00.000Z	33 \| good	5.574 \| good	23.737 \| good	14.599 \| good	0.304 \| good	4.294 \| good	0.356 \| good
2025-07-29T19:00:00.000Z	33 \| good	5.786 \| good	26.521 \| good	14.887 \| good	0.608 \| good	4.036 \| good	0.356 \| good
2025-07-29T20:00:00.000Z	27 \| good	5.418 \| good	25.911 \| good	18.206 \| good	0.32 \| good	4.267 \| good	0.34 \| good
2025-07-29T21:00:00.000Z	33 \| good	5.991 \| good	29.461 \| good	18.739 \| good	0.272 \| good	3.366 \| good	0.34 \| good
2025-07-29T22:00:00.000Z	33 \| good	6.002 \| good	29.33 \| good	21.303 \| good	0.551 \| good	3.015 \| good	0.34 \| good
2025-07-29T23:00:00.000Z	44 \| good	7.817 \| good	31.348 \| good	19.281 \| good	0.549 \| good	2.981 \| good	0.34 \| good
2025-07-30T00:00:00.000Z	33 \| good	6.179 \| good	20.725 \| good	19.967 \| good	0.582 \| good	2.815 \| good	0.318 \| good
2025-07-30T01:00:00.000Z	33 \| good	5.873 \| good	31.619 \| good	19.214 \| good	2.438 \| good	2.853 \| good	0.318 \| good
2025-07-30T02:00:00.000Z	28 \| good	3.469 \| good	29.784 \| good	24.273 \| good	11.201 \| good	2.88 \| good	0.302 \| good
2025-07-30T03:00:00.000Z	16 \| good	2.836 \| good	11.727 \| good	17.437 \| good	0.379 \| good	3.668 \| good	0.099 \| good
2025-07-30T04:00:00.000Z	21 \| good	3.386 \| good	13.995 \| good	22.852 \| good	2.299 \| good	2.611 \| good	0.318 \| good
2025-07-30T05:00:00.000Z	33 \| good	5.742 \| good	27.135 \| good	20.913 \| good	1.432 \| good	2.374 \| good	0.318 \| good
2025-07-30T06:00:00.000Z	27 \| good	4.93 \| good	20.249 \| good	17.837 \| good	0.757 \| good	1.478 \| good	0.34 \| good
2025-07-30T07:00:00.000Z	27 \| good	4.772 \| good	21.497 \| good	17.93 \| good	0.734 \| good	1.609 \| good	0.34 \| good
2025-07-30T08:00:00.000Z	22 \| good	4.323 \| good	16.457 \| good	18.654 \| good	0.635 \| good	1.161 \| good	0.34 \| good
2025-07-30T09:00:00.000Z	17 \| good	3.245 \| good	12.958 \| good	18.053 \| good	0.589 \| good	0.914 \| good	0.299 \| good
2025-07-30T10:00:00.000Z	18 \| good	3.254 \| good	15.86 \| good	18.767 \| good	0.66 \| good	1.041 \| good	0.282 \| good
2025-07-30T11:00:00.000Z	22 \| good	4.342 \| good	22.262 \| good	18.695 \| good	0.691 \| good	1.011 \| good	0.282 \| good
2025-07-30T12:00:00.000Z	22 \| good	3.526 \| good	15.683 \| good	18.413 \| good	0.685 \| good	1.112 \| good	0.282 \| good
2025-07-30T13:00:00.000Z	22 \| good	3.924 \| good	18.566 \| good	17.432 \| good	0.643 \| good	2.992 \| good	0.318 \| good
2025-07-30T14:00:00.000Z	16 \| good	3.255 \| good	14.169 \| good	16.591 \| good	0.388 \| good	3.045 \| good	0.318 \| good
2025-07-30T15:00:00.000Z	19 \| good	2.962 \| good	20.748 \| good	17.169 \| good	0.714 \| good	3.127 \| good	0.34 \| good
2025-07-30T16:00:00.000Z	16 \| good	3.446 \| good	16.689 \| good	17.223 \| good	0.692 \| good	4.354 \| good	0.318 \| good
2025-07-30T17:00:00.000Z	22 \| good	4.166 \| good	17.853 \| good	17.842 \| good	0.719 \| good	4.936 \| good	0.318 \| good
2025-07-30T18:00:00.000Z	22 \| good	4.372 \| good	19.136 \| good	18.871 \| good	0.671 \| good	4.535 \| good	0.318 \| good
2025-07-30T19:00:00.000Z	22 \| good	4.372 \| good	19.136 \| good	18.871 \| good	0.671 \| good	4.535 \| good	0.318 \| good
2025-07-30T19:00:00.000Z	22 \| good	4.388 \| good	19.217 \| good	21.677 \| good	0.51 \| good	1.643 \| good	0.085 \| good
2025-07-30T20:00:00.000Z	27 \| good	5.204 \| good	22.649 \| good	21.2 \| good	0.542 \| good	1.596 \| good	0.085 \| good
2025-07-30T21:00:00.000Z	33 \| good	5.758 \| good	24.905 \| good	20.727 \| good	0.575 \| good	1.549 \| good	0.084 \| good
2025-07-30T22:00:00.000Z	27 \| good	4.529 \| good	19.725 \| good	20.977 \| good	0.546 \| good	1.759 \| good	0.084 \| good
2025-07-30T23:00:00.000Z	22 \| good	4.016 \| good	17.55 \| good	20.207 \| good	0.518 \| good	1.97 \| good	0.083 \| good
2025-07-31T00:00:00.000Z	22 \| good	4.196 \| good	18.302 \| good	19.248 \| good	0.489 \| good	2.18 \| good	0.083 \| good
2025-07-31T01:00:00.000Z	22 \| good	3.548 \| good	15.413 \| good	18.509 \| good	0.467 \| good	2.812 \| good	0.082 \| good
2025-07-31T02:00:00.000Z	18 \| good	2.531 \| good	10.202 \| good	18.763 \| good	0.445 \| good	3.445 \| good	0.081 \| good
2025-07-31T03:00:00.000Z	18 \| good	2.134 \| good	8.557 \| good	18.721 \| good	0.423 \| good	4.077 \| good	0.081 \| good
2025-07-31T04:00:00.000Z	17 \| good	1.685 \| good	6.972 \| good	18.302 \| good	0.431 \| good	4.041 \| good	0.078 \| good
2025-07-31T05:00:00.000Z	17 \| good	2.285 \| good	9.168 \| good	18.307 \| good	0.438 \| good	4.005 \| good	0.076 \| good
2025-07-31T06:00:00.000Z	17 \| good	2.752 \| good	11.097 \| good	18.005 \| good	0.445 \| good	3.969 \| good	0.073 \| good
2025-07-31T07:00:00.000Z	17 \| good	2.483 \| good	10.261 \| good	18.175 \| good	0.448 \| good	3.782 \| good	0.072 \| good
2025-07-31T08:00:00.000Z	17 \| good	2.934 \| good	12.356 \| good	18.158 \| good	0.451 \| good	3.596 \| good	0.072 \| good
2025-07-31T09:00:00.000Z	22 \| good	3.59 \| good	16.036 \| good	16.646 \| good	0.454 \| good	3.41 \| good	0.071 \| good
2025-07-31T10:00:00.000Z	16 \| good	3.243 \| good	13.965 \| good	16.83 \| good	0.468 \| good	3.273 \| good	0.07 \| good
2025-07-31T11:00:00.000Z	16 \| good	3.131 \| good	12.79 \| good	16.184 \| good	0.482 \| good	3.136 \| good	0.069 \| good
2025-07-31T12:00:00.000Z	14 \| good	1.656 \| good	6.972 \| good	15.458 \| good	0.496 \| good	2.999 \| good	0.068 \| good
2025-07-31T13:00:00.000Z	16 \| good	2.763 \| good	11.343 \| good	15.089 \| good	0.515 \| good	2.786 \| good	0.068 \| good
2025-07-31T14:00:00.000Z	13 \| good	2.318 \| good	9.389 \| good	14.087 \| good	0.534 \| good	2.573 \| good	0.069 \| good
2025-07-31T15:00:00.000Z	22 \| good	3.519 \| good	15.323 \| good	16.215 \| good	0.552 \| good	2.36 \| good	0.069 \| good
2025-07-31T16:00:00.000Z	22 \| good	3.63 \| good	16.193 \| good	18.49 \| good	0.612 \| good	2.41 \| good	0.073 \| good
2025-07-31T17:00:00.000Z	22 \| good	3.839 \| good	16.614 \| good	20.745 \| good	0.671 \| good	2.459 \| good	0.077 \| good
2025-07-31T18:00:00.000Z	27 \| good	4.56 \| good	20.04 \| good	21.803 \| good	0.73 \| good	2.509 \| good	0.081 \| good
2025-07-31T19:00:00.000Z	27 \| good	5.088 \| good	21.983 \| good	21.064 \| good	0.75 \| good	2.372 \| good	0.081 \| good
2025-07-31T20:00:00.000Z	27 \| good	5.26 \| good	23.006 \| good	20.677 \| good	0.77 \| good	2.235 \| good	0.081 \| good
2025-07-31T21:00:00.000Z	27 \| good	5.393 \| good	23.528 \| good	20.186 \| good	0.79 \| good	2.098 \| good	0.08 \| good
2025-07-31T22:00:00.000Z	33 \| good	5.545 \| good	24.086 \| good	21.746 \| good	0.716 \| good	2.212 \| good	0.08 \| good
2025-07-31T23:00:00.000Z	27 \| good	5.15 \| good	22.564 \| good	20.952 \| good	0.642 \| good	2.326 \| good	0.079 \| good
2025-08-01T00:00:00.000Z	22 \| good	4.426 \| good	19.189 \| good	20.818 \| good	0.568 \| good	2.439 \| good	0.079 \| good
2025-08-01T01:00:00.000Z	22 \| good	3.944 \| good	17.051 \| good	20.011 \| good	0.536 \| good	3.405 \| good	0.081 \| good
2025-08-01T02:00:00.000Z	19 \| good	2.778 \| good	11.447 \| good	20.255 \| good	0.503 \| good	4.371 \| good	0.083 \| good
2025-08-01T03:00:00.000Z	19 \| good	2.431 \| good	10.262 \| good	19.669 \| good	0.47 \| good	5.336 \| good	0.085 \| good
2025-08-01T04:00:00.000Z	19 \| good	2.651 \| good	10.877 \| good	20.259 \| good	0.487 \| good	5.147 \| good	0.084 \| good
2025-08-01T05:00:00.000Z	19 \| good	2.956 \| good	12.174 \| good	19.898 \| good	0.505 \| good	4.957 \| good	0.083 \| good
2025-08-01T06:00:00.000Z	22 \| good	3.909 \| good	17.325 \| good	19.343 \| good	0.522 \| good	4.767 \| good	0.081 \| good
2025-08-01T07:00:00.000Z	19 \| good	3.251 \| good	14.223 \| good	19.947 \| good	0.497 \| good	4.189 \| good	0.08 \| good
2025-08-01T08:00:00.000Z	18 \| good	3.313 \| good	14.451 \| good	19.435 \| good	0.471 \| good	3.611 \| good	0.078 \| good
2025-08-01T09:00:00.000Z	22 \| good	4.026 \| good	17.583 \| good	18.203 \| good	0.445 \| good	3.034 \| good	0.076 \| good
2025-08-01T10:00:00.000Z	22 \| good	3.588 \| good	15.932 \| good	17.998 \| good	0.457 \| good	2.902 \| good	0.075 \| good
2025-08-01T11:00:00.000Z	16 \| good	3.442 \| good	15.183 \| good	16.274 \| good	0.47 \| good	2.771 \| good	0.074 \| good
2025-08-01T12:00:00.000Z	15 \| good	2.208 \| good	9.103 \| good	16.252 \| good	0.482 \| good	2.64 \| good	0.073 \| good
2025-08-01T13:00:00.000Z	16 \| good	3.173 \| good	13.377 \| good	14.014 \| good	0.488 \| good	2.393 \| good	0.074 \| good
2025-08-01T14:00:00.000Z	22 \| good	3.628 \| good	15.812 \| good	13.531 \| good	0.494 \| good	2.146 \| good	0.074 \| good
2025-08-01T15:00:00.000Z	22 \| good	3.853 \| good	16.888 \| good	14.806 \| good	0.499 \| good	1.899 \| good	0.075 \| good
2025-08-01T16:00:00.000Z	22 \| good	3.85 \| good	16.806 \| good	16.784 \| good	0.545 \| good	1.908 \| good	0.077 \| good
2025-08-01T17:00:00.000Z	27 \| good	4.655 \| good	20.188 \| good	18.069 \| good	0.59 \| good	1.918 \| good	0.08 \| good
2025-08-01T18:00:00.000Z	22 \| good	4.056 \| good	17.607 \| good	20.277 \| good	0.636 \| good	1.927 \| good	0.083 \| good

San Mateo

Get reliable air quality data to drive your business

San Mateo, California air quality map: Track AQI near you

0.24ppm

How accurate is California, USA air quality data?

Air quality data and pollutant measurements for California, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.

Source: Ambee Data Sources

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Frequently asked questions

How often is the air quality data for San Mateo, California updated?

The air quality for San Mateo, California is updated every hour.

When was the worst air quality at San Mateo, California in the last 24 hrs?

The worst air quality in San Mateo, California in the last 24 hours was observed at 11:00:00 on 2025-07-29.

When was the best air quality at San Mateo, California in the last 24 hrs?

In the last 24 hrs, the best air quality in San Mateo, California was observed at 04:00:00 on 2025-07-30.

What is the current air quality in San Mateo, California?

The current air quality in San Mateo, California is 22, categorized as Good based on real-time data.

What pollutant is the most common in San Mateo, California?

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

What should I do if the air quality in San Mateo, California is poor?

If the air quality in San Mateo, California is poor, consider staying indoors and wearing a mask to protect yourself.

What is the current concentration of PM_2.5 in San Mateo, California?

The current PM_2.5 concentration at San Mateo, California is 4.166 μg/m³.

What is the current concentration of PM₁₀ in San Mateo, California?

The current PM₁₀ concentration at San Mateo, California is 17.853 μg/m³.

What is the current concentration of carbon monoxide (CO) in San Mateo, California?

The current carbon monoxide (CO) concentration at San Mateo, California is 0.318 ppm.

What is the current concentration of sulfur dioxide (SO₂) in San Mateo, California?

The current sulfur dioxide (SO₂) concentration at San Mateo, California is 0.719 ppb.

What is the current concentration of ozone (O₃) in San Mateo, California?

The current ozone (O₃) concentration at San Mateo, California is 17.842 ppm.

What is the current concentration of nitrogen dioxide (NO₂) in San Mateo, California?

The current nitrogen dioxide (NO₂) concentration at San Mateo, California is 4.936 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-07-28T20:00:00.000Z	22 \| good	4.266 \| good	19.885 \| good	17.797 \| good	0.724 \| good	3.604 \| good	0.34 \| good
2025-07-28T21:00:00.000Z	22 \| good	4.365 \| good	19.137 \| good	19.036 \| good	0.765 \| good	3.625 \| good	0.34 \| good
2025-07-28T22:00:00.000Z	22 \| good	3.548 \| good	14.529 \| good	20.301 \| good	0.726 \| good	3.462 \| good	0.318 \| good
2025-07-28T23:00:00.000Z	38 \| good	6.963 \| good	22.085 \| good	23.01 \| good	0.496 \| good	3.151 \| good	0.318 \| good
2025-07-29T00:00:00.000Z	33 \| good	6.149 \| good	27.072 \| good	25.465 \| good	0.533 \| good	3.311 \| good	0.318 \| good
2025-07-29T01:00:00.000Z	33 \| good	5.7 \| good	28.094 \| good	24.521 \| good	0.537 \| good	3.518 \| good	0.318 \| good
2025-07-29T02:00:00.000Z	25 \| good	4.294 \| good	21.742 \| good	27.066 \| good	0.504 \| good	3.356 \| good	0.302 \| good
2025-07-29T03:00:00.000Z	33 \| good	6.394 \| good	20.192 \| good	28.12 \| good	0.478 \| good	4.287 \| good	0.302 \| good
2025-07-29T04:00:00.000Z	25 \| good	4.38 \| good	13.249 \| good	26.669 \| good	0.721 \| good	2.91 \| good	0.318 \| good
2025-07-29T05:00:00.000Z	24 \| good	2.361 \| good	19.934 \| good	26.261 \| good	0.713 \| good	3.116 \| good	0.362 \| good
2025-07-29T06:00:00.000Z	25 \| good	3.499 \| good	21.257 \| good	27.481 \| good	0.705 \| good	2.638 \| good	0.362 \| good
2025-07-29T07:00:00.000Z	23 \| good	3.836 \| good	15.76 \| good	24.51 \| good	0.72 \| good	2.01 \| good	0.318 \| good
2025-07-29T08:00:00.000Z	22 \| good	3.804 \| good	14.288 \| good	21.25 \| good	0.718 \| good	1.945 \| good	0.318 \| good
2025-07-29T09:00:00.000Z	22 \| good	3.993 \| good	17.942 \| good	18.387 \| good	0.721 \| good	1.337 \| good	0.302 \| good
2025-07-29T10:00:00.000Z	22 \| good	4.135 \| good	9.028 \| good	17.391 \| good	0.654 \| good	1.381 \| good	0.28 \| good
2025-07-29T11:00:00.000Z	16 \| good	3.196 \| good	6.5 \| good	16.578 \| good	0.648 \| good	1.378 \| good	0.28 \| good
2025-07-29T12:00:00.000Z	27 \| good	4.505 \| good	17.674 \| good	16.032 \| good	0.65 \| good	1.502 \| good	0.28 \| good
2025-07-29T13:00:00.000Z	22 \| good	4.133 \| good	14.725 \| good	16.8 \| good	0.565 \| good	4.102 \| good	0.318 \| good
2025-07-29T14:00:00.000Z	22 \| good	3.613 \| good	13.509 \| good	10.451 \| good	0.277 \| good	4.793 \| good	0.34 \| good
2025-07-29T15:00:00.000Z	27 \| good	4.987 \| good	21.418 \| good	13.375 \| good	0.529 \| good	4.975 \| good	0.378 \| good
2025-07-29T16:00:00.000Z	24 \| good	3.709 \| good	25.538 \| good	13.362 \| good	0.293 \| good	5.566 \| good	0.337 \| good
2025-07-29T17:00:00.000Z	33 \| good	6.146 \| good	33.334 \| good	13.552 \| good	0.308 \| good	5.325 \| good	0.356 \| good
2025-07-29T18:00:00.000Z	33 \| good	5.574 \| good	23.737 \| good	14.599 \| good	0.304 \| good	4.294 \| good	0.356 \| good
2025-07-29T19:00:00.000Z	33 \| good	5.786 \| good	26.521 \| good	14.887 \| good	0.608 \| good	4.036 \| good	0.356 \| good
2025-07-29T20:00:00.000Z	27 \| good	5.418 \| good	25.911 \| good	18.206 \| good	0.32 \| good	4.267 \| good	0.34 \| good
2025-07-29T21:00:00.000Z	33 \| good	5.991 \| good	29.461 \| good	18.739 \| good	0.272 \| good	3.366 \| good	0.34 \| good
2025-07-29T22:00:00.000Z	33 \| good	6.002 \| good	29.33 \| good	21.303 \| good	0.551 \| good	3.015 \| good	0.34 \| good
2025-07-29T23:00:00.000Z	44 \| good	7.817 \| good	31.348 \| good	19.281 \| good	0.549 \| good	2.981 \| good	0.34 \| good
2025-07-30T00:00:00.000Z	33 \| good	6.179 \| good	20.725 \| good	19.967 \| good	0.582 \| good	2.815 \| good	0.318 \| good
2025-07-30T01:00:00.000Z	33 \| good	5.873 \| good	31.619 \| good	19.214 \| good	2.438 \| good	2.853 \| good	0.318 \| good
2025-07-30T02:00:00.000Z	28 \| good	3.469 \| good	29.784 \| good	24.273 \| good	11.201 \| good	2.88 \| good	0.302 \| good
2025-07-30T03:00:00.000Z	16 \| good	2.836 \| good	11.727 \| good	17.437 \| good	0.379 \| good	3.668 \| good	0.099 \| good
2025-07-30T04:00:00.000Z	21 \| good	3.386 \| good	13.995 \| good	22.852 \| good	2.299 \| good	2.611 \| good	0.318 \| good
2025-07-30T05:00:00.000Z	33 \| good	5.742 \| good	27.135 \| good	20.913 \| good	1.432 \| good	2.374 \| good	0.318 \| good
2025-07-30T06:00:00.000Z	27 \| good	4.93 \| good	20.249 \| good	17.837 \| good	0.757 \| good	1.478 \| good	0.34 \| good
2025-07-30T07:00:00.000Z	27 \| good	4.772 \| good	21.497 \| good	17.93 \| good	0.734 \| good	1.609 \| good	0.34 \| good
2025-07-30T08:00:00.000Z	22 \| good	4.323 \| good	16.457 \| good	18.654 \| good	0.635 \| good	1.161 \| good	0.34 \| good
2025-07-30T09:00:00.000Z	17 \| good	3.245 \| good	12.958 \| good	18.053 \| good	0.589 \| good	0.914 \| good	0.299 \| good
2025-07-30T10:00:00.000Z	18 \| good	3.254 \| good	15.86 \| good	18.767 \| good	0.66 \| good	1.041 \| good	0.282 \| good
2025-07-30T11:00:00.000Z	22 \| good	4.342 \| good	22.262 \| good	18.695 \| good	0.691 \| good	1.011 \| good	0.282 \| good
2025-07-30T12:00:00.000Z	22 \| good	3.526 \| good	15.683 \| good	18.413 \| good	0.685 \| good	1.112 \| good	0.282 \| good
2025-07-30T13:00:00.000Z	22 \| good	3.924 \| good	18.566 \| good	17.432 \| good	0.643 \| good	2.992 \| good	0.318 \| good
2025-07-30T14:00:00.000Z	16 \| good	3.255 \| good	14.169 \| good	16.591 \| good	0.388 \| good	3.045 \| good	0.318 \| good
2025-07-30T15:00:00.000Z	19 \| good	2.962 \| good	20.748 \| good	17.169 \| good	0.714 \| good	3.127 \| good	0.34 \| good
2025-07-30T16:00:00.000Z	16 \| good	3.446 \| good	16.689 \| good	17.223 \| good	0.692 \| good	4.354 \| good	0.318 \| good
2025-07-30T17:00:00.000Z	22 \| good	4.166 \| good	17.853 \| good	17.842 \| good	0.719 \| good	4.936 \| good	0.318 \| good
2025-07-30T18:00:00.000Z	22 \| good	4.372 \| good	19.136 \| good	18.871 \| good	0.671 \| good	4.535 \| good	0.318 \| good
2025-07-30T19:00:00.000Z	22 \| good	4.372 \| good	19.136 \| good	18.871 \| good	0.671 \| good	4.535 \| good	0.318 \| good
2025-07-30T19:00:00.000Z	22 \| good	4.388 \| good	19.217 \| good	21.677 \| good	0.51 \| good	1.643 \| good	0.085 \| good
2025-07-30T20:00:00.000Z	27 \| good	5.204 \| good	22.649 \| good	21.2 \| good	0.542 \| good	1.596 \| good	0.085 \| good
2025-07-30T21:00:00.000Z	33 \| good	5.758 \| good	24.905 \| good	20.727 \| good	0.575 \| good	1.549 \| good	0.084 \| good
2025-07-30T22:00:00.000Z	27 \| good	4.529 \| good	19.725 \| good	20.977 \| good	0.546 \| good	1.759 \| good	0.084 \| good
2025-07-30T23:00:00.000Z	22 \| good	4.016 \| good	17.55 \| good	20.207 \| good	0.518 \| good	1.97 \| good	0.083 \| good
2025-07-31T00:00:00.000Z	22 \| good	4.196 \| good	18.302 \| good	19.248 \| good	0.489 \| good	2.18 \| good	0.083 \| good
2025-07-31T01:00:00.000Z	22 \| good	3.548 \| good	15.413 \| good	18.509 \| good	0.467 \| good	2.812 \| good	0.082 \| good
2025-07-31T02:00:00.000Z	18 \| good	2.531 \| good	10.202 \| good	18.763 \| good	0.445 \| good	3.445 \| good	0.081 \| good
2025-07-31T03:00:00.000Z	18 \| good	2.134 \| good	8.557 \| good	18.721 \| good	0.423 \| good	4.077 \| good	0.081 \| good
2025-07-31T04:00:00.000Z	17 \| good	1.685 \| good	6.972 \| good	18.302 \| good	0.431 \| good	4.041 \| good	0.078 \| good
2025-07-31T05:00:00.000Z	17 \| good	2.285 \| good	9.168 \| good	18.307 \| good	0.438 \| good	4.005 \| good	0.076 \| good
2025-07-31T06:00:00.000Z	17 \| good	2.752 \| good	11.097 \| good	18.005 \| good	0.445 \| good	3.969 \| good	0.073 \| good
2025-07-31T07:00:00.000Z	17 \| good	2.483 \| good	10.261 \| good	18.175 \| good	0.448 \| good	3.782 \| good	0.072 \| good
2025-07-31T08:00:00.000Z	17 \| good	2.934 \| good	12.356 \| good	18.158 \| good	0.451 \| good	3.596 \| good	0.072 \| good
2025-07-31T09:00:00.000Z	22 \| good	3.59 \| good	16.036 \| good	16.646 \| good	0.454 \| good	3.41 \| good	0.071 \| good
2025-07-31T10:00:00.000Z	16 \| good	3.243 \| good	13.965 \| good	16.83 \| good	0.468 \| good	3.273 \| good	0.07 \| good
2025-07-31T11:00:00.000Z	16 \| good	3.131 \| good	12.79 \| good	16.184 \| good	0.482 \| good	3.136 \| good	0.069 \| good
2025-07-31T12:00:00.000Z	14 \| good	1.656 \| good	6.972 \| good	15.458 \| good	0.496 \| good	2.999 \| good	0.068 \| good
2025-07-31T13:00:00.000Z	16 \| good	2.763 \| good	11.343 \| good	15.089 \| good	0.515 \| good	2.786 \| good	0.068 \| good
2025-07-31T14:00:00.000Z	13 \| good	2.318 \| good	9.389 \| good	14.087 \| good	0.534 \| good	2.573 \| good	0.069 \| good
2025-07-31T15:00:00.000Z	22 \| good	3.519 \| good	15.323 \| good	16.215 \| good	0.552 \| good	2.36 \| good	0.069 \| good
2025-07-31T16:00:00.000Z	22 \| good	3.63 \| good	16.193 \| good	18.49 \| good	0.612 \| good	2.41 \| good	0.073 \| good
2025-07-31T17:00:00.000Z	22 \| good	3.839 \| good	16.614 \| good	20.745 \| good	0.671 \| good	2.459 \| good	0.077 \| good
2025-07-31T18:00:00.000Z	27 \| good	4.56 \| good	20.04 \| good	21.803 \| good	0.73 \| good	2.509 \| good	0.081 \| good
2025-07-31T19:00:00.000Z	27 \| good	5.088 \| good	21.983 \| good	21.064 \| good	0.75 \| good	2.372 \| good	0.081 \| good
2025-07-31T20:00:00.000Z	27 \| good	5.26 \| good	23.006 \| good	20.677 \| good	0.77 \| good	2.235 \| good	0.081 \| good
2025-07-31T21:00:00.000Z	27 \| good	5.393 \| good	23.528 \| good	20.186 \| good	0.79 \| good	2.098 \| good	0.08 \| good
2025-07-31T22:00:00.000Z	33 \| good	5.545 \| good	24.086 \| good	21.746 \| good	0.716 \| good	2.212 \| good	0.08 \| good
2025-07-31T23:00:00.000Z	27 \| good	5.15 \| good	22.564 \| good	20.952 \| good	0.642 \| good	2.326 \| good	0.079 \| good
2025-08-01T00:00:00.000Z	22 \| good	4.426 \| good	19.189 \| good	20.818 \| good	0.568 \| good	2.439 \| good	0.079 \| good
2025-08-01T01:00:00.000Z	22 \| good	3.944 \| good	17.051 \| good	20.011 \| good	0.536 \| good	3.405 \| good	0.081 \| good
2025-08-01T02:00:00.000Z	19 \| good	2.778 \| good	11.447 \| good	20.255 \| good	0.503 \| good	4.371 \| good	0.083 \| good
2025-08-01T03:00:00.000Z	19 \| good	2.431 \| good	10.262 \| good	19.669 \| good	0.47 \| good	5.336 \| good	0.085 \| good
2025-08-01T04:00:00.000Z	19 \| good	2.651 \| good	10.877 \| good	20.259 \| good	0.487 \| good	5.147 \| good	0.084 \| good
2025-08-01T05:00:00.000Z	19 \| good	2.956 \| good	12.174 \| good	19.898 \| good	0.505 \| good	4.957 \| good	0.083 \| good
2025-08-01T06:00:00.000Z	22 \| good	3.909 \| good	17.325 \| good	19.343 \| good	0.522 \| good	4.767 \| good	0.081 \| good
2025-08-01T07:00:00.000Z	19 \| good	3.251 \| good	14.223 \| good	19.947 \| good	0.497 \| good	4.189 \| good	0.08 \| good
2025-08-01T08:00:00.000Z	18 \| good	3.313 \| good	14.451 \| good	19.435 \| good	0.471 \| good	3.611 \| good	0.078 \| good
2025-08-01T09:00:00.000Z	22 \| good	4.026 \| good	17.583 \| good	18.203 \| good	0.445 \| good	3.034 \| good	0.076 \| good
2025-08-01T10:00:00.000Z	22 \| good	3.588 \| good	15.932 \| good	17.998 \| good	0.457 \| good	2.902 \| good	0.075 \| good
2025-08-01T11:00:00.000Z	16 \| good	3.442 \| good	15.183 \| good	16.274 \| good	0.47 \| good	2.771 \| good	0.074 \| good
2025-08-01T12:00:00.000Z	15 \| good	2.208 \| good	9.103 \| good	16.252 \| good	0.482 \| good	2.64 \| good	0.073 \| good
2025-08-01T13:00:00.000Z	16 \| good	3.173 \| good	13.377 \| good	14.014 \| good	0.488 \| good	2.393 \| good	0.074 \| good
2025-08-01T14:00:00.000Z	22 \| good	3.628 \| good	15.812 \| good	13.531 \| good	0.494 \| good	2.146 \| good	0.074 \| good
2025-08-01T15:00:00.000Z	22 \| good	3.853 \| good	16.888 \| good	14.806 \| good	0.499 \| good	1.899 \| good	0.075 \| good
2025-08-01T16:00:00.000Z	22 \| good	3.85 \| good	16.806 \| good	16.784 \| good	0.545 \| good	1.908 \| good	0.077 \| good
2025-08-01T17:00:00.000Z	27 \| good	4.655 \| good	20.188 \| good	18.069 \| good	0.59 \| good	1.918 \| good	0.08 \| good
2025-08-01T18:00:00.000Z	22 \| good	4.056 \| good	17.607 \| good	20.277 \| good	0.636 \| good	1.927 \| good	0.083 \| good

San Mateo, California live air quality index now

Major air pollutants in San Mateo, California

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

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San Mateo, California air quality map: Track AQI near you

Air quality in nearby cities

Burlingame, California

Foster City, California

Hillsborough, California

Belmont, California

Millbrae, California

San Carlos, California

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Frequently asked questions

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What is the current concentration of PM2.5 in San Mateo, California?

What is the current concentration of PM10 in San Mateo, California?

What is the current concentration of carbon monoxide (CO) in San Mateo, California?

What is the current concentration of sulfur dioxide (SO2) in San Mateo, California?

What is the current concentration of ozone (O3) in San Mateo, California?

What is the current concentration of nitrogen dioxide (NO2) in San Mateo, California?

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What is the current concentration of PM_2.5 in San Mateo, California?

What is the current concentration of PM₁₀ in San Mateo, California?

What is the current concentration of sulfur dioxide (SO₂) in San Mateo, California?

What is the current concentration of ozone (O₃) in San Mateo, California?

What is the current concentration of nitrogen dioxide (NO₂) in San Mateo, California?