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

The current PM10 concentration at San Mateo, California is 24.111 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 0.454 ppb.

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

The current ozone (O3) concentration at San Mateo, California is 30.905 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 5.85 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 6.359 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)

4.36 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

19.07 μg/m³

155

255

425

605+

Ozone (O₃)

23.55 ppb

201

201+

Sulfur Dioxide (SO₂)

0.50 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

4.62 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.30 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

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
2025-10-21T10:00:00.000Z	52 \| moderate	10.383 \| good	33.191 \| good	35.071 \| good	0.859 \| good	25.918 \| good	0.588 \| good
2025-10-21T11:00:00.000Z	52 \| moderate	9.608 \| good	32.137 \| good	34.425 \| good	0.833 \| good	25.481 \| good	0.565 \| good
2025-10-21T12:00:00.000Z	58 \| moderate	12.934 \| fine	67.805 \| fine	12.179 \| good	0.836 \| good	25.767 \| good	0.548 \| good
2025-10-21T13:00:00.000Z	62 \| moderate	15.102 \| fine	68.52 \| fine	9.646 \| good	0.896 \| good	25.903 \| good	0.487 \| good
2025-10-21T14:00:00.000Z	58 \| moderate	13.32 \| fine	57.83 \| fine	6.573 \| good	0.662 \| good	26.582 \| good	0.597 \| good
2025-10-21T15:00:00.000Z	58 \| moderate	13.165 \| fine	67.066 \| fine	6.883 \| good	0.763 \| good	24.362 \| good	0.708 \| good
2025-10-21T16:00:00.000Z	60 \| moderate	14.329 \| fine	66.651 \| fine	6.931 \| good	0.781 \| good	33.505 \| good	0.859 \| good
2025-10-21T17:00:00.000Z	66 \| moderate	16.73 \| fine	75.756 \| fine	8.997 \| good	0.902 \| good	29.024 \| good	0.832 \| good
2025-10-21T18:00:00.000Z	81 \| moderate	25.381 \| fine	90.228 \| fine	10.39 \| good	1.562 \| good	28.71 \| good	0.485 \| good
2025-10-21T19:00:00.000Z	79 \| moderate	23.665 \| fine	98.653 \| fine	20.188 \| good	1.524 \| good	27.68 \| good	0.334 \| good
2025-10-21T20:00:00.000Z	60 \| moderate	13.717 \| fine	73.17 \| fine	30.954 \| good	1.194 \| good	25.444 \| good	0.244 \| good
2025-10-21T21:00:00.000Z	56 \| moderate	11.719 \| good	54.145 \| good	35.849 \| good	1.114 \| good	20.372 \| good	0.206 \| good
2025-10-21T22:00:00.000Z	69 \| moderate	14.275 \| fine	92.341 \| fine	37.131 \| good	0.924 \| good	8.287 \| good	0.219 \| good
2025-10-21T23:00:00.000Z	44 \| good	7.797 \| good	28.229 \| good	40.537 \| good	0.809 \| good	5.608 \| good	0.154 \| good
2025-10-22T00:00:00.000Z	38 \| good	7.082 \| good	20.996 \| good	40.477 \| good	0.703 \| good	6.423 \| good	0.205 \| good
2025-10-22T01:00:00.000Z	44 \| good	8.224 \| good	28.695 \| good	34.994 \| good	0.773 \| good	4.992 \| good	0.219 \| good
2025-10-22T02:00:00.000Z	49 \| good	8.627 \| good	21.791 \| good	38.609 \| good	0.679 \| good	5.991 \| good	0.306 \| good
2025-10-22T03:00:00.000Z	33 \| good	5.917 \| good	25.539 \| good	27.691 \| good	1.146 \| good	17.981 \| good	0.222 \| good
2025-10-22T04:00:00.000Z	33 \| good	6.028 \| good	23.535 \| good	33.774 \| good	0.642 \| good	11.101 \| good	0.272 \| good
2025-10-22T05:00:00.000Z	38 \| good	7.188 \| good	23.325 \| good	34.325 \| good	0.681 \| good	10.483 \| good	0.241 \| good
2025-10-22T06:00:00.000Z	34 \| good	6.444 \| good	18.375 \| good	36.544 \| good	0.619 \| good	10.844 \| good	0.241 \| good
2025-10-22T07:00:00.000Z	33 \| good	5.815 \| good	16.784 \| good	36.056 \| good	0.603 \| good	10.522 \| good	0.241 \| good
2025-10-22T08:00:00.000Z	33 \| good	6.346 \| good	26.581 \| good	34.6 \| good	0.558 \| good	8.881 \| good	0.241 \| good
2025-10-22T09:00:00.000Z	33 \| good	5.5 \| good	28.078 \| good	35.893 \| good	0.556 \| good	7.946 \| good	0.221 \| good
2025-10-22T10:00:00.000Z	27 \| good	4.657 \| good	26.141 \| good	27.249 \| good	0.587 \| good	3.521 \| good	0.25 \| good
2025-10-22T11:00:00.000Z	29 \| good	4.417 \| good	20.43 \| good	30.523 \| good	0.62 \| good	2.31 \| good	0.25 \| good
2025-10-22T12:00:00.000Z	29 \| good	3.925 \| good	16.578 \| good	31.066 \| good	0.66 \| good	3.297 \| good	0.221 \| good
2025-10-22T13:00:00.000Z	28 \| good	4.467 \| good	24.152 \| good	30.423 \| good	0.518 \| good	3.127 \| good	0.148 \| good
2025-10-22T14:00:00.000Z	29 \| good	5.49 \| good	21.542 \| good	31.167 \| good	0.962 \| good	4.852 \| good	0.238 \| good
2025-10-22T15:00:00.000Z	38 \| good	6.65 \| good	18.96 \| good	30.144 \| good	0.923 \| good	4.825 \| good	0.238 \| good
2025-10-22T16:00:00.000Z	33 \| good	6.315 \| good	20.683 \| good	27.49 \| good	0.943 \| good	5.927 \| good	0.246 \| good
2025-10-22T17:00:00.000Z	38 \| good	7.497 \| good	28.484 \| good	31.304 \| good	1.266 \| good	7.55 \| good	0.307 \| good
2025-10-22T18:00:00.000Z	38 \| good	7.376 \| good	30.417 \| good	28.718 \| good	1.311 \| good	7.952 \| good	0.299 \| good
2025-10-22T19:00:00.000Z	38 \| good	7.029 \| good	29.044 \| good	32.752 \| good	0.639 \| good	7.493 \| good	0.313 \| good
2025-10-22T20:00:00.000Z	38 \| good	6.686 \| good	28.237 \| good	28.501 \| good	0.435 \| good	5.636 \| good	0.287 \| good
2025-10-22T21:00:00.000Z	38 \| good	7.394 \| good	32.18 \| good	34.546 \| good	0.416 \| good	4.824 \| good	0.263 \| good
2025-10-22T22:00:00.000Z	38 \| good	6.673 \| good	24.421 \| good	33.724 \| good	0.513 \| good	5.023 \| good	0.281 \| good
2025-10-22T23:00:00.000Z	38 \| good	7.279 \| good	27.502 \| good	33.454 \| good	0.655 \| good	4.575 \| good	0.263 \| good
2025-10-23T00:00:00.000Z	38 \| good	7.327 \| good	24.432 \| good	36.602 \| good	1.936 \| good	5.867 \| good	0.287 \| good
2025-10-23T01:00:00.000Z	44 \| good	8.139 \| good	30.096 \| good	35.157 \| good	1.475 \| good	6.586 \| good	0.263 \| good
2025-10-23T02:00:00.000Z	38 \| good	6.802 \| good	29.993 \| good	33.572 \| good	0.527 \| good	5.336 \| good	0.287 \| good
2025-10-23T03:00:00.000Z	33 \| good	6.359 \| good	24.111 \| good	30.905 \| good	0.454 \| good	5.85 \| good	0.287 \| good
2025-10-23T04:00:00.000Z	33 \| good	6.164 \| good	27.165 \| good	32.472 \| good	0.498 \| good	5.953 \| good	0.342 \| good
2025-10-23T05:00:00.000Z	33 \| good	5.511 \| good	20.198 \| good	30.894 \| good	0.541 \| good	6.417 \| good	0.342 \| good
2025-10-23T06:00:00.000Z	27 \| good	4.987 \| good	16.802 \| good	29.495 \| good	0.519 \| good	4.254 \| good	0.284 \| good
2025-10-23T07:00:00.000Z	27 \| good	4.947 \| good	19.897 \| good	28.131 \| good	0.498 \| good	4.632 \| good	0.284 \| good
2025-10-23T08:00:00.000Z	22 \| good	4.359 \| good	19.066 \| good	23.545 \| good	0.501 \| good	4.616 \| good	0.304 \| good
2025-10-23T09:00:00.000Z	38 \| good	6.592 \| good	17.256 \| good	22.871 \| good	0.519 \| good	5.097 \| good	0.259 \| good
2025-10-23T09:00:00.000Z	22 \| good	4.359 \| good	19.066 \| good	23.545 \| good	0.501 \| good	4.616 \| good	0.304 \| good
2025-10-23T05:00:00.000Z	21 \| good	2.354 \| good	9.877 \| good	22.614 \| good	0.845 \| good	8.11 \| good	0.157 \| good
2025-10-23T06:00:00.000Z	22 \| good	1.643 \| good	6.638 \| good	23.531 \| good	0.791 \| good	8.52 \| good	0.159 \| good
2025-10-23T07:00:00.000Z	22 \| good	1.415 \| good	5.359 \| good	24.367 \| good	0.701 \| good	7.302 \| good	0.155 \| good
2025-10-23T08:00:00.000Z	22 \| good	1.627 \| good	6.581 \| good	23.946 \| good	0.61 \| good	6.084 \| good	0.15 \| good
2025-10-23T09:00:00.000Z	21 \| good	1.458 \| good	6.105 \| good	23.033 \| good	0.519 \| good	4.865 \| good	0.145 \| good
2025-10-23T10:00:00.000Z	19 \| good	1.863 \| good	7.621 \| good	20.826 \| good	0.52 \| good	4.269 \| good	0.142 \| good
2025-10-23T11:00:00.000Z	19 \| good	1.898 \| good	7.642 \| good	20.054 \| good	0.522 \| good	3.673 \| good	0.139 \| good
2025-10-23T12:00:00.000Z	19 \| good	2.153 \| good	8.922 \| good	20.292 \| good	0.523 \| good	3.076 \| good	0.135 \| good
2025-10-23T13:00:00.000Z	22 \| good	1.933 \| good	8.193 \| good	23.636 \| good	0.556 \| good	3.985 \| good	0.142 \| good
2025-10-23T14:00:00.000Z	21 \| good	1.431 \| good	5.649 \| good	23.017 \| good	0.589 \| good	4.893 \| good	0.149 \| good
2025-10-23T15:00:00.000Z	24 \| good	1.576 \| good	6.58 \| good	25.864 \| good	0.622 \| good	5.801 \| good	0.156 \| good
2025-10-23T16:00:00.000Z	25 \| good	1.68 \| good	6.864 \| good	27.066 \| good	0.698 \| good	4.832 \| good	0.152 \| good
2025-10-23T17:00:00.000Z	27 \| good	2.975 \| good	11.892 \| good	29.07 \| good	0.774 \| good	3.863 \| good	0.147 \| good
2025-10-23T18:00:00.000Z	31 \| good	3.16 \| good	13.874 \| good	33.038 \| good	0.849 \| good	2.893 \| good	0.142 \| good
2025-10-23T19:00:00.000Z	31 \| good	3.258 \| good	14.44 \| good	33.967 \| good	0.897 \| good	2.709 \| good	0.141 \| good
2025-10-23T20:00:00.000Z	31 \| good	3.739 \| good	16.223 \| good	34.163 \| good	0.944 \| good	2.524 \| good	0.14 \| good
2025-10-23T21:00:00.000Z	32 \| good	3.875 \| good	16.756 \| good	34.97 \| good	0.992 \| good	2.34 \| good	0.139 \| good
2025-10-23T22:00:00.000Z	34 \| good	4.303 \| good	18.549 \| good	37.291 \| good	0.982 \| good	2.573 \| good	0.137 \| good
2025-10-23T23:00:00.000Z	34 \| good	4.879 \| good	21.216 \| good	37.49 \| good	0.972 \| good	2.805 \| good	0.135 \| good
2025-10-24T00:00:00.000Z	34 \| good	3.614 \| good	15.768 \| good	36.633 \| good	0.962 \| good	3.038 \| good	0.134 \| good
2025-10-24T01:00:00.000Z	29 \| good	3.713 \| good	16.416 \| good	30.782 \| good	0.939 \| good	5.24 \| good	0.144 \| good
2025-10-24T02:00:00.000Z	25 \| good	4.477 \| good	19.559 \| good	27.373 \| good	0.916 \| good	7.441 \| good	0.154 \| good
2025-10-24T03:00:00.000Z	25 \| good	3.624 \| good	15.977 \| good	27.429 \| good	0.893 \| good	9.643 \| good	0.164 \| good
2025-10-24T04:00:00.000Z	22 \| good	3.587 \| good	15.817 \| good	24.076 \| good	0.89 \| good	9.917 \| good	0.166 \| good
2025-10-24T05:00:00.000Z	19 \| good	3.096 \| good	12.964 \| good	21.482 \| good	0.888 \| good	10.191 \| good	0.168 \| good
2025-10-24T06:00:00.000Z	19 \| good	2.369 \| good	10.155 \| good	21.361 \| good	0.885 \| good	10.465 \| good	0.17 \| good
2025-10-24T07:00:00.000Z	20 \| good	1.961 \| good	8.268 \| good	21.963 \| good	0.813 \| good	10.012 \| good	0.163 \| good
2025-10-24T08:00:00.000Z	20 \| good	2.028 \| good	8.392 \| good	22.427 \| good	0.741 \| good	9.559 \| good	0.157 \| good
2025-10-24T09:00:00.000Z	20 \| good	2.097 \| good	9.016 \| good	21.937 \| good	0.669 \| good	9.106 \| good	0.151 \| good
2025-10-24T10:00:00.000Z	20 \| good	1.627 \| good	6.486 \| good	21.838 \| good	0.665 \| good	8.427 \| good	0.146 \| good
2025-10-24T11:00:00.000Z	21 \| good	1.684 \| good	6.517 \| good	23.113 \| good	0.662 \| good	7.748 \| good	0.14 \| good
2025-10-24T12:00:00.000Z	20 \| good	1.863 \| good	7.498 \| good	22.186 \| good	0.658 \| good	7.068 \| good	0.135 \| good
2025-10-24T13:00:00.000Z	19 \| good	1.021 \| good	4.005 \| good	20.621 \| good	0.703 \| good	7.109 \| good	0.137 \| good
2025-10-24T14:00:00.000Z	16 \| good	1.448 \| good	6.076 \| good	16.53 \| good	0.747 \| good	7.149 \| good	0.139 \| good
2025-10-24T15:00:00.000Z	17 \| good	1.818 \| good	7.61 \| good	17.778 \| good	0.792 \| good	7.189 \| good	0.142 \| good
2025-10-24T16:00:00.000Z	19 \| good	2.304 \| good	9.782 \| good	20.245 \| good	0.791 \| good	5.717 \| good	0.131 \| good
2025-10-24T17:00:00.000Z	22 \| good	3.539 \| good	15.314 \| good	24.315 \| good	0.789 \| good	4.245 \| good	0.12 \| good
2025-10-24T18:00:00.000Z	24 \| good	2.835 \| good	11.585 \| good	25.764 \| good	0.788 \| good	2.773 \| good	0.11 \| good
2025-10-24T19:00:00.000Z	23 \| good	2.708 \| good	11.441 \| good	25.332 \| good	0.769 \| good	2.462 \| good	0.107 \| good
2025-10-24T20:00:00.000Z	26 \| good	2.493 \| good	10.217 \| good	28.428 \| good	0.749 \| good	2.152 \| good	0.105 \| good
2025-10-24T21:00:00.000Z	28 \| good	1.812 \| good	7.322 \| good	29.505 \| good	0.73 \| good	1.841 \| good	0.102 \| good
2025-10-24T22:00:00.000Z	28 \| good	1.441 \| good	5.804 \| good	29.846 \| good	0.714 \| good	2.012 \| good	0.101 \| good
2025-10-24T23:00:00.000Z	28 \| good	1.42 \| good	5.898 \| good	29.551 \| good	0.699 \| good	2.182 \| good	0.1 \| good
2025-10-25T00:00:00.000Z	38 \| good	6.891 \| good	9.926 \| good	35.933 \| good	0.683 \| good	2.345 \| good	0.099 \| good
2025-10-25T01:00:00.000Z	23 \| good	0.835 \| good	2.921 \| good	25.243 \| good	0.774 \| good	4.649 \| good	0.11 \| good
2025-10-25T02:00:00.000Z	19 \| good	1.183 \| good	5.059 \| good	19.953 \| good	0.866 \| good	6.945 \| good	0.12 \| good
2025-10-25T03:00:00.000Z	19 \| good	1.65 \| good	6.474 \| good	20.324 \| good	0.957 \| good	9.242 \| good	0.131 \| good
2025-10-25T04:00:00.000Z	17 \| good	2.28 \| good	9.215 \| good	17.937 \| good	0.961 \| good	10.172 \| good	0.138 \| good

San Mateo

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

0.26ppm

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 01:00:00 on 2025-10-23.

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 10:00:00 on 2025-10-22.

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

The current air quality in San Mateo, California is 33, 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 6.359 μg/m³.

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

The current PM₁₀ concentration at San Mateo, California is 24.111 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 0.287 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 0.454 ppb.

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

The current ozone (O₃) concentration at San Mateo, California is 30.905 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 5.85 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-10-21T10:00:00.000Z	52 \| moderate	10.383 \| good	33.191 \| good	35.071 \| good	0.859 \| good	25.918 \| good	0.588 \| good
2025-10-21T11:00:00.000Z	52 \| moderate	9.608 \| good	32.137 \| good	34.425 \| good	0.833 \| good	25.481 \| good	0.565 \| good
2025-10-21T12:00:00.000Z	58 \| moderate	12.934 \| fine	67.805 \| fine	12.179 \| good	0.836 \| good	25.767 \| good	0.548 \| good
2025-10-21T13:00:00.000Z	62 \| moderate	15.102 \| fine	68.52 \| fine	9.646 \| good	0.896 \| good	25.903 \| good	0.487 \| good
2025-10-21T14:00:00.000Z	58 \| moderate	13.32 \| fine	57.83 \| fine	6.573 \| good	0.662 \| good	26.582 \| good	0.597 \| good
2025-10-21T15:00:00.000Z	58 \| moderate	13.165 \| fine	67.066 \| fine	6.883 \| good	0.763 \| good	24.362 \| good	0.708 \| good
2025-10-21T16:00:00.000Z	60 \| moderate	14.329 \| fine	66.651 \| fine	6.931 \| good	0.781 \| good	33.505 \| good	0.859 \| good
2025-10-21T17:00:00.000Z	66 \| moderate	16.73 \| fine	75.756 \| fine	8.997 \| good	0.902 \| good	29.024 \| good	0.832 \| good
2025-10-21T18:00:00.000Z	81 \| moderate	25.381 \| fine	90.228 \| fine	10.39 \| good	1.562 \| good	28.71 \| good	0.485 \| good
2025-10-21T19:00:00.000Z	79 \| moderate	23.665 \| fine	98.653 \| fine	20.188 \| good	1.524 \| good	27.68 \| good	0.334 \| good
2025-10-21T20:00:00.000Z	60 \| moderate	13.717 \| fine	73.17 \| fine	30.954 \| good	1.194 \| good	25.444 \| good	0.244 \| good
2025-10-21T21:00:00.000Z	56 \| moderate	11.719 \| good	54.145 \| good	35.849 \| good	1.114 \| good	20.372 \| good	0.206 \| good
2025-10-21T22:00:00.000Z	69 \| moderate	14.275 \| fine	92.341 \| fine	37.131 \| good	0.924 \| good	8.287 \| good	0.219 \| good
2025-10-21T23:00:00.000Z	44 \| good	7.797 \| good	28.229 \| good	40.537 \| good	0.809 \| good	5.608 \| good	0.154 \| good
2025-10-22T00:00:00.000Z	38 \| good	7.082 \| good	20.996 \| good	40.477 \| good	0.703 \| good	6.423 \| good	0.205 \| good
2025-10-22T01:00:00.000Z	44 \| good	8.224 \| good	28.695 \| good	34.994 \| good	0.773 \| good	4.992 \| good	0.219 \| good
2025-10-22T02:00:00.000Z	49 \| good	8.627 \| good	21.791 \| good	38.609 \| good	0.679 \| good	5.991 \| good	0.306 \| good
2025-10-22T03:00:00.000Z	33 \| good	5.917 \| good	25.539 \| good	27.691 \| good	1.146 \| good	17.981 \| good	0.222 \| good
2025-10-22T04:00:00.000Z	33 \| good	6.028 \| good	23.535 \| good	33.774 \| good	0.642 \| good	11.101 \| good	0.272 \| good
2025-10-22T05:00:00.000Z	38 \| good	7.188 \| good	23.325 \| good	34.325 \| good	0.681 \| good	10.483 \| good	0.241 \| good
2025-10-22T06:00:00.000Z	34 \| good	6.444 \| good	18.375 \| good	36.544 \| good	0.619 \| good	10.844 \| good	0.241 \| good
2025-10-22T07:00:00.000Z	33 \| good	5.815 \| good	16.784 \| good	36.056 \| good	0.603 \| good	10.522 \| good	0.241 \| good
2025-10-22T08:00:00.000Z	33 \| good	6.346 \| good	26.581 \| good	34.6 \| good	0.558 \| good	8.881 \| good	0.241 \| good
2025-10-22T09:00:00.000Z	33 \| good	5.5 \| good	28.078 \| good	35.893 \| good	0.556 \| good	7.946 \| good	0.221 \| good
2025-10-22T10:00:00.000Z	27 \| good	4.657 \| good	26.141 \| good	27.249 \| good	0.587 \| good	3.521 \| good	0.25 \| good
2025-10-22T11:00:00.000Z	29 \| good	4.417 \| good	20.43 \| good	30.523 \| good	0.62 \| good	2.31 \| good	0.25 \| good
2025-10-22T12:00:00.000Z	29 \| good	3.925 \| good	16.578 \| good	31.066 \| good	0.66 \| good	3.297 \| good	0.221 \| good
2025-10-22T13:00:00.000Z	28 \| good	4.467 \| good	24.152 \| good	30.423 \| good	0.518 \| good	3.127 \| good	0.148 \| good
2025-10-22T14:00:00.000Z	29 \| good	5.49 \| good	21.542 \| good	31.167 \| good	0.962 \| good	4.852 \| good	0.238 \| good
2025-10-22T15:00:00.000Z	38 \| good	6.65 \| good	18.96 \| good	30.144 \| good	0.923 \| good	4.825 \| good	0.238 \| good
2025-10-22T16:00:00.000Z	33 \| good	6.315 \| good	20.683 \| good	27.49 \| good	0.943 \| good	5.927 \| good	0.246 \| good
2025-10-22T17:00:00.000Z	38 \| good	7.497 \| good	28.484 \| good	31.304 \| good	1.266 \| good	7.55 \| good	0.307 \| good
2025-10-22T18:00:00.000Z	38 \| good	7.376 \| good	30.417 \| good	28.718 \| good	1.311 \| good	7.952 \| good	0.299 \| good
2025-10-22T19:00:00.000Z	38 \| good	7.029 \| good	29.044 \| good	32.752 \| good	0.639 \| good	7.493 \| good	0.313 \| good
2025-10-22T20:00:00.000Z	38 \| good	6.686 \| good	28.237 \| good	28.501 \| good	0.435 \| good	5.636 \| good	0.287 \| good
2025-10-22T21:00:00.000Z	38 \| good	7.394 \| good	32.18 \| good	34.546 \| good	0.416 \| good	4.824 \| good	0.263 \| good
2025-10-22T22:00:00.000Z	38 \| good	6.673 \| good	24.421 \| good	33.724 \| good	0.513 \| good	5.023 \| good	0.281 \| good
2025-10-22T23:00:00.000Z	38 \| good	7.279 \| good	27.502 \| good	33.454 \| good	0.655 \| good	4.575 \| good	0.263 \| good
2025-10-23T00:00:00.000Z	38 \| good	7.327 \| good	24.432 \| good	36.602 \| good	1.936 \| good	5.867 \| good	0.287 \| good
2025-10-23T01:00:00.000Z	44 \| good	8.139 \| good	30.096 \| good	35.157 \| good	1.475 \| good	6.586 \| good	0.263 \| good
2025-10-23T02:00:00.000Z	38 \| good	6.802 \| good	29.993 \| good	33.572 \| good	0.527 \| good	5.336 \| good	0.287 \| good
2025-10-23T03:00:00.000Z	33 \| good	6.359 \| good	24.111 \| good	30.905 \| good	0.454 \| good	5.85 \| good	0.287 \| good
2025-10-23T04:00:00.000Z	33 \| good	6.164 \| good	27.165 \| good	32.472 \| good	0.498 \| good	5.953 \| good	0.342 \| good
2025-10-23T05:00:00.000Z	33 \| good	5.511 \| good	20.198 \| good	30.894 \| good	0.541 \| good	6.417 \| good	0.342 \| good
2025-10-23T06:00:00.000Z	27 \| good	4.987 \| good	16.802 \| good	29.495 \| good	0.519 \| good	4.254 \| good	0.284 \| good
2025-10-23T07:00:00.000Z	27 \| good	4.947 \| good	19.897 \| good	28.131 \| good	0.498 \| good	4.632 \| good	0.284 \| good
2025-10-23T08:00:00.000Z	22 \| good	4.359 \| good	19.066 \| good	23.545 \| good	0.501 \| good	4.616 \| good	0.304 \| good
2025-10-23T09:00:00.000Z	38 \| good	6.592 \| good	17.256 \| good	22.871 \| good	0.519 \| good	5.097 \| good	0.259 \| good
2025-10-23T09:00:00.000Z	22 \| good	4.359 \| good	19.066 \| good	23.545 \| good	0.501 \| good	4.616 \| good	0.304 \| good
2025-10-23T05:00:00.000Z	21 \| good	2.354 \| good	9.877 \| good	22.614 \| good	0.845 \| good	8.11 \| good	0.157 \| good
2025-10-23T06:00:00.000Z	22 \| good	1.643 \| good	6.638 \| good	23.531 \| good	0.791 \| good	8.52 \| good	0.159 \| good
2025-10-23T07:00:00.000Z	22 \| good	1.415 \| good	5.359 \| good	24.367 \| good	0.701 \| good	7.302 \| good	0.155 \| good
2025-10-23T08:00:00.000Z	22 \| good	1.627 \| good	6.581 \| good	23.946 \| good	0.61 \| good	6.084 \| good	0.15 \| good
2025-10-23T09:00:00.000Z	21 \| good	1.458 \| good	6.105 \| good	23.033 \| good	0.519 \| good	4.865 \| good	0.145 \| good
2025-10-23T10:00:00.000Z	19 \| good	1.863 \| good	7.621 \| good	20.826 \| good	0.52 \| good	4.269 \| good	0.142 \| good
2025-10-23T11:00:00.000Z	19 \| good	1.898 \| good	7.642 \| good	20.054 \| good	0.522 \| good	3.673 \| good	0.139 \| good
2025-10-23T12:00:00.000Z	19 \| good	2.153 \| good	8.922 \| good	20.292 \| good	0.523 \| good	3.076 \| good	0.135 \| good
2025-10-23T13:00:00.000Z	22 \| good	1.933 \| good	8.193 \| good	23.636 \| good	0.556 \| good	3.985 \| good	0.142 \| good
2025-10-23T14:00:00.000Z	21 \| good	1.431 \| good	5.649 \| good	23.017 \| good	0.589 \| good	4.893 \| good	0.149 \| good
2025-10-23T15:00:00.000Z	24 \| good	1.576 \| good	6.58 \| good	25.864 \| good	0.622 \| good	5.801 \| good	0.156 \| good
2025-10-23T16:00:00.000Z	25 \| good	1.68 \| good	6.864 \| good	27.066 \| good	0.698 \| good	4.832 \| good	0.152 \| good
2025-10-23T17:00:00.000Z	27 \| good	2.975 \| good	11.892 \| good	29.07 \| good	0.774 \| good	3.863 \| good	0.147 \| good
2025-10-23T18:00:00.000Z	31 \| good	3.16 \| good	13.874 \| good	33.038 \| good	0.849 \| good	2.893 \| good	0.142 \| good
2025-10-23T19:00:00.000Z	31 \| good	3.258 \| good	14.44 \| good	33.967 \| good	0.897 \| good	2.709 \| good	0.141 \| good
2025-10-23T20:00:00.000Z	31 \| good	3.739 \| good	16.223 \| good	34.163 \| good	0.944 \| good	2.524 \| good	0.14 \| good
2025-10-23T21:00:00.000Z	32 \| good	3.875 \| good	16.756 \| good	34.97 \| good	0.992 \| good	2.34 \| good	0.139 \| good
2025-10-23T22:00:00.000Z	34 \| good	4.303 \| good	18.549 \| good	37.291 \| good	0.982 \| good	2.573 \| good	0.137 \| good
2025-10-23T23:00:00.000Z	34 \| good	4.879 \| good	21.216 \| good	37.49 \| good	0.972 \| good	2.805 \| good	0.135 \| good
2025-10-24T00:00:00.000Z	34 \| good	3.614 \| good	15.768 \| good	36.633 \| good	0.962 \| good	3.038 \| good	0.134 \| good
2025-10-24T01:00:00.000Z	29 \| good	3.713 \| good	16.416 \| good	30.782 \| good	0.939 \| good	5.24 \| good	0.144 \| good
2025-10-24T02:00:00.000Z	25 \| good	4.477 \| good	19.559 \| good	27.373 \| good	0.916 \| good	7.441 \| good	0.154 \| good
2025-10-24T03:00:00.000Z	25 \| good	3.624 \| good	15.977 \| good	27.429 \| good	0.893 \| good	9.643 \| good	0.164 \| good
2025-10-24T04:00:00.000Z	22 \| good	3.587 \| good	15.817 \| good	24.076 \| good	0.89 \| good	9.917 \| good	0.166 \| good
2025-10-24T05:00:00.000Z	19 \| good	3.096 \| good	12.964 \| good	21.482 \| good	0.888 \| good	10.191 \| good	0.168 \| good
2025-10-24T06:00:00.000Z	19 \| good	2.369 \| good	10.155 \| good	21.361 \| good	0.885 \| good	10.465 \| good	0.17 \| good
2025-10-24T07:00:00.000Z	20 \| good	1.961 \| good	8.268 \| good	21.963 \| good	0.813 \| good	10.012 \| good	0.163 \| good
2025-10-24T08:00:00.000Z	20 \| good	2.028 \| good	8.392 \| good	22.427 \| good	0.741 \| good	9.559 \| good	0.157 \| good
2025-10-24T09:00:00.000Z	20 \| good	2.097 \| good	9.016 \| good	21.937 \| good	0.669 \| good	9.106 \| good	0.151 \| good
2025-10-24T10:00:00.000Z	20 \| good	1.627 \| good	6.486 \| good	21.838 \| good	0.665 \| good	8.427 \| good	0.146 \| good
2025-10-24T11:00:00.000Z	21 \| good	1.684 \| good	6.517 \| good	23.113 \| good	0.662 \| good	7.748 \| good	0.14 \| good
2025-10-24T12:00:00.000Z	20 \| good	1.863 \| good	7.498 \| good	22.186 \| good	0.658 \| good	7.068 \| good	0.135 \| good
2025-10-24T13:00:00.000Z	19 \| good	1.021 \| good	4.005 \| good	20.621 \| good	0.703 \| good	7.109 \| good	0.137 \| good
2025-10-24T14:00:00.000Z	16 \| good	1.448 \| good	6.076 \| good	16.53 \| good	0.747 \| good	7.149 \| good	0.139 \| good
2025-10-24T15:00:00.000Z	17 \| good	1.818 \| good	7.61 \| good	17.778 \| good	0.792 \| good	7.189 \| good	0.142 \| good
2025-10-24T16:00:00.000Z	19 \| good	2.304 \| good	9.782 \| good	20.245 \| good	0.791 \| good	5.717 \| good	0.131 \| good
2025-10-24T17:00:00.000Z	22 \| good	3.539 \| good	15.314 \| good	24.315 \| good	0.789 \| good	4.245 \| good	0.12 \| good
2025-10-24T18:00:00.000Z	24 \| good	2.835 \| good	11.585 \| good	25.764 \| good	0.788 \| good	2.773 \| good	0.11 \| good
2025-10-24T19:00:00.000Z	23 \| good	2.708 \| good	11.441 \| good	25.332 \| good	0.769 \| good	2.462 \| good	0.107 \| good
2025-10-24T20:00:00.000Z	26 \| good	2.493 \| good	10.217 \| good	28.428 \| good	0.749 \| good	2.152 \| good	0.105 \| good
2025-10-24T21:00:00.000Z	28 \| good	1.812 \| good	7.322 \| good	29.505 \| good	0.73 \| good	1.841 \| good	0.102 \| good
2025-10-24T22:00:00.000Z	28 \| good	1.441 \| good	5.804 \| good	29.846 \| good	0.714 \| good	2.012 \| good	0.101 \| good
2025-10-24T23:00:00.000Z	28 \| good	1.42 \| good	5.898 \| good	29.551 \| good	0.699 \| good	2.182 \| good	0.1 \| good
2025-10-25T00:00:00.000Z	38 \| good	6.891 \| good	9.926 \| good	35.933 \| good	0.683 \| good	2.345 \| good	0.099 \| good
2025-10-25T01:00:00.000Z	23 \| good	0.835 \| good	2.921 \| good	25.243 \| good	0.774 \| good	4.649 \| good	0.11 \| good
2025-10-25T02:00:00.000Z	19 \| good	1.183 \| good	5.059 \| good	19.953 \| good	0.866 \| good	6.945 \| good	0.12 \| good
2025-10-25T03:00:00.000Z	19 \| good	1.65 \| good	6.474 \| good	20.324 \| good	0.957 \| good	9.242 \| good	0.131 \| good
2025-10-25T04:00:00.000Z	17 \| good	2.28 \| good	9.215 \| good	17.937 \| good	0.961 \| good	10.172 \| good	0.138 \| 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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Air quality levels in US

Frequently asked questions

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

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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?