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

The current PM10 concentration at San Mateo, California is 22.535 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 0.519 ppb.

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

The current ozone (O3) concentration at San Mateo, California is 36.686 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 5.272 ppb.

San Mateo, California live air quality index now

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

The current PM2.5 concentration at San Mateo, California is 6.947 μg/m3.

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)

8.69 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

34.25 μg/m³

155

255

425

605+

Ozone (O₃)

29.83 ppb

201

201+

Sulfur Dioxide (SO₂)

0.34 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

4.09 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.30 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Looks like we don't have this data available right now

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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
2026-03-08T06:00:00.000Z	22 \| good	4.348 \| good	13.881 \| good	19.366 \| good	0.509 \| good	12.623 \| good	0.57 \| good
2026-03-08T07:00:00.000Z	27 \| good	5.384 \| good	21.423 \| good	20.967 \| good	0.472 \| good	15.628 \| good	0.567 \| good
2026-03-08T08:00:00.000Z	38 \| good	7.043 \| good	27.197 \| good	20.473 \| good	0.459 \| good	11.791 \| good	0.636 \| good
2026-03-08T09:00:00.000Z	22 \| good	3.846 \| good	18.811 \| good	18.224 \| good	0.487 \| good	12.949 \| good	0.636 \| good
2026-03-08T10:00:00.000Z	17 \| good	2.937 \| good	11.117 \| good	17.598 \| good	0.348 \| good	7.673 \| good	0.228 \| good
2026-03-08T11:00:00.000Z	33 \| good	5.631 \| good	15.054 \| good	22.337 \| good	0.378 \| good	11.119 \| good	0.2 \| good
2026-03-08T12:00:00.000Z	44 \| good	8.192 \| good	14.856 \| good	23.068 \| good	0.166 \| good	14.764 \| good	0.588 \| good
2026-03-08T13:00:00.000Z	44 \| good	8.488 \| good	34.19 \| good	14.854 \| good	0.446 \| good	10.835 \| good	0.585 \| good
2026-03-08T14:00:00.000Z	38 \| good	7.461 \| good	23.812 \| good	11.434 \| good	0.486 \| good	11.3 \| good	0.681 \| good
2026-03-08T15:00:00.000Z	49 \| good	8.531 \| good	34.712 \| good	7.755 \| good	0.52 \| good	11.85 \| good	0.707 \| good
2026-03-08T16:00:00.000Z	49 \| good	8.643 \| good	41.329 \| good	6.659 \| good	0.548 \| good	12.492 \| good	0.662 \| good
2026-03-08T17:00:00.000Z	38 \| good	6.754 \| good	33.447 \| good	12.45 \| good	1.005 \| good	9.94 \| good	0.596 \| good
2026-03-08T18:00:00.000Z	27 \| good	5.044 \| good	21.548 \| good	13.58 \| good	1.226 \| good	12.166 \| good	0.605 \| good
2026-03-08T19:00:00.000Z	38 \| good	7.017 \| good	31.494 \| good	16.161 \| good	1.231 \| good	9.851 \| good	0.535 \| good
2026-03-08T20:00:00.000Z	44 \| good	8.054 \| good	33.424 \| good	21.562 \| good	1.178 \| good	9.077 \| good	0.502 \| good
2026-03-08T21:00:00.000Z	38 \| good	6.684 \| good	27.18 \| good	25.499 \| good	0.847 \| good	7.598 \| good	0.485 \| good
2026-03-08T22:00:00.000Z	28 \| good	4.815 \| good	24.489 \| good	29.911 \| good	0.679 \| good	7.274 \| good	0.434 \| good
2026-03-08T23:00:00.000Z	33 \| good	5.545 \| good	22.44 \| good	33.219 \| good	0.622 \| good	7.43 \| good	0.453 \| good
2026-03-09T00:00:00.000Z	35 \| good	5.966 \| good	21.158 \| good	38.293 \| good	0.442 \| good	7.099 \| good	0.452 \| good
2026-03-09T01:00:00.000Z	34 \| good	3.72 \| good	15.824 \| good	36.898 \| good	0.463 \| good	5.692 \| good	0.45 \| good
2026-03-09T02:00:00.000Z	35 \| good	3.916 \| good	17.583 \| good	37.985 \| good	0.538 \| good	4.7 \| good	0.43 \| good
2026-03-09T03:00:00.000Z	54 \| moderate	10.703 \| good	47.594 \| good	38.291 \| good	1.391 \| good	21.955 \| good	0.243 \| good
2026-03-09T04:00:00.000Z	32 \| good	4.839 \| good	25.311 \| good	35.467 \| good	0.413 \| good	8.064 \| good	0.497 \| good
2026-03-09T05:00:00.000Z	44 \| good	7.588 \| good	32.468 \| good	30.445 \| good	0.419 \| good	9.083 \| good	0.498 \| good
2026-03-09T06:00:00.000Z	39 \| good	6.005 \| good	41.522 \| good	33.509 \| good	0.338 \| good	13.191 \| good	0.5 \| good
2026-03-09T07:00:00.000Z	33 \| good	6.275 \| good	31.391 \| good	28.937 \| good	0.336 \| good	9.33 \| good	0.468 \| good
2026-03-09T08:00:00.000Z	33 \| good	6.391 \| good	18.824 \| good	26.264 \| good	0.327 \| good	5.598 \| good	0.428 \| good
2026-03-09T09:00:00.000Z	33 \| good	6.224 \| good	9.321 \| good	23.65 \| good	0.293 \| good	4.171 \| good	0.413 \| good
2026-03-09T10:00:00.000Z	20 \| good	1.938 \| good	12.166 \| good	22.307 \| good	0.257 \| good	3.664 \| good	0.446 \| good
2026-03-09T11:00:00.000Z	13 \| good	2.15 \| good	8.217 \| good	14.076 \| good	0.328 \| good	3.652 \| good	0.446 \| good
2026-03-09T12:00:00.000Z	19 \| good	2.342 \| good	5.671 \| good	21.408 \| good	0.3 \| good	3.408 \| good	0.446 \| good
2026-03-09T13:00:00.000Z	20 \| good	3.161 \| good	13.525 \| good	22.035 \| good	0.477 \| good	7.466 \| good	0.529 \| good
2026-03-09T14:00:00.000Z	19 \| good	0.9 \| good	4.03 \| good	19.592 \| good	0.444 \| good	9.54 \| good	0.578 \| good
2026-03-09T15:00:00.000Z	20 \| good	3.36 \| good	21.614 \| good	11.537 \| good	0.349 \| good	13.125 \| good	0.675 \| good
2026-03-09T16:00:00.000Z	15 \| good	2.369 \| good	16.282 \| good	7.401 \| good	0.431 \| good	12.222 \| good	0.757 \| good
2026-03-09T17:00:00.000Z	27 \| good	5.272 \| good	21.817 \| good	14.391 \| good	0.386 \| good	8.731 \| good	0.594 \| good
2026-03-09T18:00:00.000Z	49 \| good	8.749 \| good	33.699 \| good	15.514 \| good	0.36 \| good	12.008 \| good	0.547 \| good
2026-03-09T19:00:00.000Z	58 \| moderate	13.157 \| fine	59.918 \| fine	19.08 \| good	0.431 \| good	10.479 \| good	0.434 \| good
2026-03-09T20:00:00.000Z	56 \| moderate	11.839 \| good	51.113 \| good	22.009 \| good	0.922 \| good	6.785 \| good	0.346 \| good
2026-03-09T21:00:00.000Z	52 \| moderate	10.232 \| good	39.092 \| good	25.135 \| good	0.653 \| good	7.018 \| good	0.363 \| good
2026-03-09T22:00:00.000Z	44 \| good	7.591 \| good	27.237 \| good	26.515 \| good	0.425 \| good	7.926 \| good	0.383 \| good
2026-03-09T23:00:00.000Z	44 \| good	7.77 \| good	23.151 \| good	30.276 \| good	0.573 \| good	5.726 \| good	0.346 \| good
2026-03-10T00:00:00.000Z	44 \| good	7.734 \| good	25.405 \| good	33.039 \| good	0.532 \| good	5.216 \| good	0.346 \| good
2026-03-10T01:00:00.000Z	38 \| good	6.947 \| good	22.535 \| good	36.686 \| good	0.519 \| good	5.272 \| good	0.346 \| good
2026-03-10T02:00:00.000Z	38 \| good	7.458 \| good	23.292 \| good	31.68 \| good	0.364 \| good	5.693 \| good	0.347 \| good
2026-03-10T03:00:00.000Z	35 \| good	3.789 \| good	16.624 \| good	38.386 \| good	0.778 \| good	8.916 \| good	0.163 \| good
2026-03-10T04:00:00.000Z	49 \| good	8.692 \| good	34.253 \| good	29.827 \| good	0.344 \| good	4.089 \| good	0.302 \| good
2026-03-10T05:00:00.000Z	49 \| good	8.692 \| good	34.253 \| good	29.827 \| good	0.344 \| good	4.089 \| good	0.302 \| good
2026-03-10T02:00:00.000Z	33 \| good	4.536 \| good	19.708 \| good	36.413 \| good	0.769 \| good	7.121 \| good	0.153 \| good
2026-03-10T03:00:00.000Z	34 \| good	4.215 \| good	18.248 \| good	36.632 \| good	0.683 \| good	8.572 \| good	0.159 \| good
2026-03-10T04:00:00.000Z	36 \| good	3.496 \| good	15.113 \| good	38.753 \| good	0.662 \| good	9.164 \| good	0.162 \| good
2026-03-10T05:00:00.000Z	35 \| good	2.251 \| good	9.215 \| good	38.431 \| good	0.642 \| good	9.755 \| good	0.165 \| good
2026-03-10T06:00:00.000Z	33 \| good	3.443 \| good	14.946 \| good	36.131 \| good	0.622 \| good	10.347 \| good	0.168 \| good
2026-03-10T07:00:00.000Z	39 \| good	2.954 \| good	12.233 \| good	41.95 \| good	0.579 \| good	9.491 \| good	0.164 \| good
2026-03-10T08:00:00.000Z	39 \| good	1.313 \| good	5.61 \| good	41.849 \| good	0.537 \| good	8.634 \| good	0.16 \| good
2026-03-10T09:00:00.000Z	37 \| good	1.236 \| good	4.923 \| good	40.083 \| good	0.494 \| good	7.778 \| good	0.156 \| good
2026-03-10T10:00:00.000Z	37 \| good	1.573 \| good	6.063 \| good	40.13 \| good	0.486 \| good	6.899 \| good	0.152 \| good
2026-03-10T11:00:00.000Z	37 \| good	1.654 \| good	6.471 \| good	39.763 \| good	0.478 \| good	6.02 \| good	0.148 \| good
2026-03-10T12:00:00.000Z	35 \| good	1.279 \| good	5.214 \| good	37.953 \| good	0.47 \| good	5.142 \| good	0.143 \| good
2026-03-10T13:00:00.000Z	35 \| good	1.069 \| good	4.154 \| good	37.893 \| good	0.487 \| good	5.509 \| good	0.147 \| good
2026-03-10T14:00:00.000Z	32 \| good	0.628 \| good	2.606 \| good	35.346 \| good	0.504 \| good	5.877 \| good	0.15 \| good
2026-03-10T15:00:00.000Z	31 \| good	1.543 \| good	6.031 \| good	33.016 \| good	0.521 \| good	6.244 \| good	0.154 \| good
2026-03-10T16:00:00.000Z	35 \| good	1.834 \| good	7.768 \| good	37.737 \| good	0.582 \| good	5.12 \| good	0.149 \| good
2026-03-10T17:00:00.000Z	36 \| good	1.41 \| good	5.848 \| good	38.656 \| good	0.643 \| good	3.995 \| good	0.144 \| good
2026-03-10T18:00:00.000Z	31 \| good	1.94 \| good	8.033 \| good	33.367 \| good	0.704 \| good	2.87 \| good	0.139 \| good
2026-03-10T19:00:00.000Z	31 \| good	3.31 \| good	14.355 \| good	33.74 \| good	0.704 \| good	2.668 \| good	0.138 \| good
2026-03-10T20:00:00.000Z	32 \| good	3.762 \| good	16.485 \| good	34.794 \| good	0.703 \| good	2.466 \| good	0.137 \| good
2026-03-10T21:00:00.000Z	31 \| good	4.852 \| good	21.235 \| good	34.435 \| good	0.703 \| good	2.263 \| good	0.137 \| good
2026-03-10T22:00:00.000Z	31 \| good	5.454 \| good	23.795 \| good	33.265 \| good	0.667 \| good	2.371 \| good	0.136 \| good
2026-03-10T23:00:00.000Z	31 \| good	4.883 \| good	21.193 \| good	33.274 \| good	0.631 \| good	2.478 \| good	0.135 \| good
2026-03-11T00:00:00.000Z	31 \| good	3.451 \| good	14.894 \| good	34.183 \| good	0.595 \| good	2.585 \| good	0.135 \| good
2026-03-11T01:00:00.000Z	33 \| good	2.293 \| good	9.323 \| good	36.029 \| good	0.594 \| good	4.856 \| good	0.146 \| good
2026-03-11T02:00:00.000Z	31 \| good	4.565 \| good	20.048 \| good	33.696 \| good	0.594 \| good	7.128 \| good	0.157 \| good
2026-03-11T03:00:00.000Z	30 \| good	4.807 \| good	21.145 \| good	31.743 \| good	0.593 \| good	9.399 \| good	0.169 \| good
2026-03-11T04:00:00.000Z	33 \| good	5.629 \| good	24.56 \| good	32.083 \| good	0.626 \| good	9.72 \| good	0.181 \| good
2026-03-11T05:00:00.000Z	27 \| good	5.195 \| good	22.411 \| good	29.238 \| good	0.658 \| good	10.041 \| good	0.193 \| good
2026-03-11T06:00:00.000Z	49 \| good	9.21 \| good	11.49 \| good	32.999 \| good	0.683 \| good	10.215 \| good	0.204 \| good
2026-03-11T07:00:00.000Z	27 \| good	5.133 \| good	22.501 \| good	28.663 \| good	0.678 \| good	10.16 \| good	0.206 \| good
2026-03-11T08:00:00.000Z	30 \| good	2.512 \| good	10.466 \| good	31.963 \| good	0.666 \| good	9.957 \| good	0.208 \| good
2026-03-11T09:00:00.000Z	29 \| good	2.259 \| good	9.451 \| good	31.268 \| good	0.653 \| good	9.754 \| good	0.209 \| good
2026-03-11T10:00:00.000Z	26 \| good	3.135 \| good	13.295 \| good	27.783 \| good	0.64 \| good	9.492 \| good	0.204 \| good
2026-03-11T11:00:00.000Z	28 \| good	3.248 \| good	13.978 \| good	29.534 \| good	0.626 \| good	9.229 \| good	0.2 \| good
2026-03-11T12:00:00.000Z	49 \| good	9.171 \| good	11.266 \| good	29.845 \| good	0.601 \| good	8.798 \| good	0.194 \| good
2026-03-11T13:00:00.000Z	49 \| good	9.069 \| good	11.195 \| good	28.616 \| good	0.679 \| good	8.837 \| good	0.201 \| good
2026-03-11T14:00:00.000Z	49 \| good	9.264 \| good	11.348 \| good	27.387 \| good	0.756 \| good	8.877 \| good	0.207 \| good
2026-03-11T15:00:00.000Z	54 \| moderate	10.552 \| good	12.477 \| good	26.158 \| good	0.834 \| good	8.916 \| good	0.214 \| good
2026-03-11T16:00:00.000Z	54 \| moderate	10.927 \| good	12.702 \| good	26.857 \| good	1.198 \| good	8.985 \| good	0.206 \| good
2026-03-11T17:00:00.000Z	49 \| good	8.968 \| good	39.798 \| good	24.552 \| good	1.563 \| good	9.073 \| good	0.198 \| good
2026-03-11T18:00:00.000Z	52 \| moderate	10.445 \| good	12.388 \| good	28.256 \| good	1.926 \| good	9.122 \| good	0.19 \| good
2026-03-11T19:00:00.000Z	54 \| moderate	10.569 \| good	12.578 \| good	30.792 \| good	1.874 \| good	8.804 \| good	0.188 \| good
2026-03-11T20:00:00.000Z	54 \| moderate	11.291 \| good	13.46 \| good	33.329 \| good	1.822 \| good	8.486 \| good	0.186 \| good
2026-03-11T21:00:00.000Z	58 \| moderate	12.712 \| fine	15.151 \| good	35.866 \| good	1.77 \| good	8.167 \| good	0.185 \| good
2026-03-11T22:00:00.000Z	58 \| moderate	13.203 \| fine	15.91 \| good	37.121 \| good	1.585 \| good	8.096 \| good	0.182 \| good
2026-03-11T23:00:00.000Z	58 \| moderate	12.871 \| fine	15.688 \| good	38.376 \| good	1.4 \| good	8.024 \| good	0.18 \| good
2026-03-12T00:00:00.000Z	56 \| moderate	12.333 \| fine	15.123 \| good	39.631 \| good	1.215 \| good	7.952 \| good	0.178 \| good
2026-03-12T01:00:00.000Z	56 \| moderate	12.041 \| good	14.803 \| good	33.801 \| good	1.176 \| good	11.359 \| good	0.192 \| good

San Mateo

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

0.30ppm

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 07:00:00 on 2026-03-09.

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 11:00:00 on 2026-03-09.

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

The current air quality in San Mateo, California is 38, 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 6.947 μg/m³.

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

The current PM₁₀ concentration at San Mateo, California is 22.535 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 0.346 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 0.519 ppb.

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

The current ozone (O₃) concentration at San Mateo, California is 36.686 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 5.272 ppb.

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