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

The current PM10 concentration at San Mateo, California is 55.249 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 0.724 ppb.

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

The current ozone (O3) concentration at San Mateo, California is 14.515 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 10.044 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 13.917 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)

Moderate

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)

13.92 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

55.25 μg/m³

155

255

425

605+

Ozone (O₃)

14.52 ppb

201

201+

Sulfur Dioxide (SO₂)

0.72 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

10.04 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.40 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
2026-01-22T00:00:00.000Z	58 \| moderate	12.851 \| fine	56.947 \| fine	8.849 \| good	0.869 \| good	16.913 \| good	0.543 \| good
2026-01-22T01:00:00.000Z	60 \| moderate	13.61 \| fine	60.707 \| fine	8.868 \| good	0.835 \| good	19.045 \| good	0.595 \| good
2026-01-22T02:00:00.000Z	60 \| moderate	14.05 \| fine	62.896 \| fine	6.675 \| good	0.773 \| good	19.285 \| good	0.637 \| good
2026-01-22T03:00:00.000Z	60 \| moderate	13.996 \| fine	62.359 \| fine	5.108 \| good	0.813 \| good	20.263 \| good	0.608 \| good
2026-01-22T04:00:00.000Z	58 \| moderate	12.9 \| fine	57.224 \| fine	5.496 \| good	0.78 \| good	20.815 \| good	0.542 \| good
2026-01-22T05:00:00.000Z	58 \| moderate	13.445 \| fine	59.171 \| fine	5.455 \| good	0.78 \| good	21.33 \| good	0.597 \| good
2026-01-22T06:00:00.000Z	62 \| moderate	14.504 \| fine	63.603 \| fine	3.422 \| good	0.845 \| good	19.883 \| good	0.793 \| good
2026-01-22T07:00:00.000Z	62 \| moderate	14.623 \| fine	65.088 \| fine	5.993 \| good	0.829 \| good	20.963 \| good	0.809 \| good
2026-01-22T08:00:00.000Z	62 \| moderate	14.528 \| fine	62.273 \| fine	5.675 \| good	0.903 \| good	19.032 \| good	0.778 \| good
2026-01-22T09:00:00.000Z	60 \| moderate	13.577 \| fine	61.479 \| fine	4.56 \| good	0.831 \| good	18.374 \| good	0.68 \| good
2026-01-22T10:00:00.000Z	60 \| moderate	14.191 \| fine	60.933 \| fine	5.692 \| good	0.84 \| good	16.615 \| good	0.593 \| good
2026-01-22T11:00:00.000Z	58 \| moderate	12.745 \| fine	56.488 \| fine	4.729 \| good	0.807 \| good	16.012 \| good	0.599 \| good
2026-01-22T12:00:00.000Z	58 \| moderate	12.676 \| fine	55.536 \| fine	4.32 \| good	0.783 \| good	15.71 \| good	0.599 \| good
2026-01-22T13:00:00.000Z	56 \| moderate	12.449 \| fine	55.666 \| fine	3.576 \| good	0.792 \| good	16.136 \| good	0.614 \| good
2026-01-22T14:00:00.000Z	56 \| moderate	12.437 \| fine	53.718 \| good	3.796 \| good	0.755 \| good	14.452 \| good	0.596 \| good
2026-01-22T15:00:00.000Z	54 \| moderate	11.077 \| good	50.057 \| good	3.208 \| good	0.787 \| good	13.633 \| good	0.75 \| good
2026-01-22T16:00:00.000Z	54 \| moderate	11.369 \| good	50.523 \| good	2.605 \| good	0.76 \| good	17.049 \| good	0.984 \| good
2026-01-22T17:00:00.000Z	52 \| moderate	10.216 \| good	45.486 \| good	3.237 \| good	0.82 \| good	16.873 \| good	0.859 \| good
2026-01-22T18:00:00.000Z	64 \| moderate	15.777 \| fine	68.05 \| fine	4.322 \| good	0.955 \| good	13.086 \| good	0.592 \| good
2026-01-22T19:00:00.000Z	64 \| moderate	16.35 \| fine	72.966 \| fine	5.613 \| good	0.924 \| good	13.027 \| good	0.577 \| good
2026-01-22T20:00:00.000Z	64 \| moderate	16.163 \| fine	69.887 \| fine	5.94 \| good	1.065 \| good	13.576 \| good	0.562 \| good
2026-01-22T21:00:00.000Z	64 \| moderate	16.079 \| fine	68.858 \| fine	6.924 \| good	0.977 \| good	13.108 \| good	0.557 \| good
2026-01-22T22:00:00.000Z	62 \| moderate	14.956 \| fine	63.939 \| fine	9.356 \| good	0.79 \| good	12.253 \| good	0.455 \| good
2026-01-22T23:00:00.000Z	60 \| moderate	13.677 \| fine	61.457 \| fine	13.333 \| good	0.951 \| good	12.771 \| good	0.463 \| good
2026-01-23T00:00:00.000Z	60 \| moderate	13.78 \| fine	59.605 \| fine	16.068 \| good	0.896 \| good	11.828 \| good	0.463 \| good
2026-01-23T01:00:00.000Z	56 \| moderate	12.432 \| fine	55.033 \| fine	17.931 \| good	0.816 \| good	14.647 \| good	0.428 \| good
2026-01-23T02:00:00.000Z	58 \| moderate	12.585 \| fine	56.892 \| fine	17.88 \| good	1.324 \| good	16.213 \| good	0.508 \| good
2026-01-23T03:00:00.000Z	54 \| moderate	11.375 \| good	49.631 \| good	15.098 \| good	0.839 \| good	18.798 \| good	0.493 \| good
2026-01-23T04:00:00.000Z	54 \| moderate	10.935 \| good	48.019 \| good	14.202 \| good	0.685 \| good	17.863 \| good	0.551 \| good
2026-01-23T05:00:00.000Z	54 \| moderate	10.842 \| good	46.997 \| good	13.106 \| good	0.59 \| good	17.519 \| good	0.632 \| good
2026-01-23T06:00:00.000Z	56 \| moderate	11.66 \| good	50.374 \| good	9.813 \| good	0.502 \| good	16.847 \| good	0.614 \| good
2026-01-23T07:00:00.000Z	54 \| moderate	11.201 \| good	50.689 \| good	6.561 \| good	0.437 \| good	18.505 \| good	0.645 \| good
2026-01-23T08:00:00.000Z	58 \| moderate	12.787 \| fine	56.28 \| fine	5.833 \| good	0.453 \| good	15.202 \| good	0.568 \| good
2026-01-23T09:00:00.000Z	58 \| moderate	13.439 \| fine	56.621 \| fine	5.133 \| good	0.495 \| good	14.141 \| good	0.504 \| good
2026-01-23T10:00:00.000Z	56 \| moderate	12.5 \| fine	53.841 \| good	4.474 \| good	0.571 \| good	12.058 \| good	0.517 \| good
2026-01-23T11:00:00.000Z	58 \| moderate	12.801 \| fine	58.636 \| fine	4.291 \| good	0.55 \| good	11.492 \| good	0.459 \| good
2026-01-23T12:00:00.000Z	54 \| moderate	11.146 \| good	48.814 \| good	9.674 \| good	0.384 \| good	11.196 \| good	0.458 \| good
2026-01-23T13:00:00.000Z	54 \| moderate	10.972 \| good	48.621 \| good	5.903 \| good	0.926 \| good	10.899 \| good	0.411 \| good
2026-01-23T14:00:00.000Z	52 \| moderate	9.72 \| good	42.696 \| good	5.2 \| good	0.931 \| good	11.821 \| good	0.411 \| good
2026-01-23T15:00:00.000Z	52 \| moderate	9.752 \| good	42.668 \| good	6.302 \| good	0.896 \| good	14.016 \| good	0.476 \| good
2026-01-23T16:00:00.000Z	49 \| good	8.949 \| good	38.215 \| good	7.652 \| good	0.749 \| good	14.166 \| good	0.476 \| good
2026-01-23T17:00:00.000Z	49 \| good	8.96 \| good	41.843 \| good	8.492 \| good	0.659 \| good	11.214 \| good	0.407 \| good
2026-01-23T18:00:00.000Z	49 \| good	9.171 \| good	40.142 \| good	10.483 \| good	0.65 \| good	10.988 \| good	0.401 \| good
2026-01-23T19:00:00.000Z	54 \| moderate	11.32 \| good	51.301 \| good	11.82 \| good	0.813 \| good	7.545 \| good	0.415 \| good
2026-01-23T20:00:00.000Z	58 \| moderate	12.525 \| fine	55.401 \| fine	13.965 \| good	1.007 \| good	8.673 \| good	0.411 \| good
2026-01-23T21:00:00.000Z	56 \| moderate	11.967 \| good	54.39 \| good	15.569 \| good	0.822 \| good	8.388 \| good	0.418 \| good
2026-01-23T22:00:00.000Z	58 \| moderate	12.841 \| fine	56.852 \| fine	17.706 \| good	0.732 \| good	8.38 \| good	0.437 \| good
2026-01-23T23:00:00.000Z	58 \| moderate	12.688 \| fine	55.83 \| fine	17.829 \| good	0.847 \| good	8.013 \| good	0.413 \| good
2026-01-23T23:00:00.000Z	60 \| moderate	13.917 \| fine	55.249 \| fine	14.515 \| good	0.724 \| good	10.044 \| good	0.397 \| good
2026-01-24T00:00:00.000Z	88 \| moderate	28.586 \| fine	124.535 \| fine	16.866 \| good	2.537 \| good	9.078 \| good	0.217 \| good
2026-01-24T01:00:00.000Z	73 \| moderate	20.928 \| fine	91.826 \| fine	12.672 \| good	2.479 \| good	12.381 \| good	0.244 \| good
2026-01-24T02:00:00.000Z	67 \| moderate	17.844 \| fine	79.17 \| fine	17.174 \| good	2.42 \| good	15.683 \| good	0.27 \| good
2026-01-24T03:00:00.000Z	60 \| moderate	14.025 \| fine	63.167 \| fine	20.814 \| good	2.362 \| good	18.986 \| good	0.297 \| good
2026-01-24T04:00:00.000Z	60 \| moderate	13.949 \| fine	63.121 \| fine	21.83 \| good	2.447 \| good	19.915 \| good	0.31 \| good
2026-01-24T05:00:00.000Z	58 \| moderate	13.225 \| fine	59.469 \| fine	20.293 \| good	2.533 \| good	20.843 \| good	0.324 \| good
2026-01-24T06:00:00.000Z	58 \| moderate	13.243 \| fine	59.512 \| fine	17.299 \| good	2.618 \| good	21.772 \| good	0.337 \| good
2026-01-24T07:00:00.000Z	56 \| moderate	12.307 \| fine	55.455 \| fine	15.873 \| good	2.459 \| good	20.937 \| good	0.333 \| good
2026-01-24T08:00:00.000Z	52 \| moderate	10.04 \| good	44.804 \| good	15.889 \| good	2.299 \| good	20.101 \| good	0.33 \| good
2026-01-24T09:00:00.000Z	52 \| moderate	9.853 \| good	43.778 \| good	13.316 \| good	2.14 \| good	19.266 \| good	0.326 \| good
2026-01-24T10:00:00.000Z	44 \| good	8.347 \| good	36.388 \| good	11.807 \| good	2.129 \| good	19.377 \| good	0.325 \| good
2026-01-24T11:00:00.000Z	52 \| moderate	9.511 \| good	42.038 \| good	10.793 \| good	2.118 \| good	19.488 \| good	0.324 \| good
2026-01-24T12:00:00.000Z	54 \| moderate	10.815 \| good	47.769 \| good	7.671 \| good	2.108 \| good	19.599 \| good	0.323 \| good
2026-01-24T13:00:00.000Z	58 \| moderate	12.52 \| fine	55.619 \| fine	6.445 \| good	2.277 \| good	20.338 \| good	0.312 \| good
2026-01-24T14:00:00.000Z	58 \| moderate	13.086 \| fine	58.663 \| fine	3.919 \| good	2.446 \| good	21.076 \| good	0.302 \| good
2026-01-24T15:00:00.000Z	66 \| moderate	17.009 \| fine	75.019 \| fine	3.059 \| good	2.615 \| good	21.815 \| good	0.292 \| good
2026-01-24T16:00:00.000Z	64 \| moderate	16.13 \| fine	71.18 \| fine	7.452 \| good	2.41 \| good	19.643 \| good	0.28 \| good
2026-01-24T17:00:00.000Z	66 \| moderate	16.617 \| fine	73.382 \| fine	14.416 \| good	2.206 \| good	17.471 \| good	0.268 \| good
2026-01-24T18:00:00.000Z	58 \| moderate	13.369 \| fine	60.427 \| fine	20.248 \| good	2.002 \| good	15.299 \| good	0.255 \| good
2026-01-24T19:00:00.000Z	56 \| moderate	12.405 \| fine	55.06 \| fine	21.322 \| good	1.708 \| good	11.956 \| good	0.221 \| good
2026-01-24T20:00:00.000Z	49 \| good	8.716 \| good	38.021 \| good	24.037 \| good	1.415 \| good	8.613 \| good	0.186 \| good
2026-01-24T21:00:00.000Z	33 \| good	5.844 \| good	26.323 \| good	26.552 \| good	1.121 \| good	5.27 \| good	0.151 \| good
2026-01-24T22:00:00.000Z	27 \| good	2.757 \| good	11.664 \| good	28.691 \| good	1.125 \| good	5.958 \| good	0.151 \| good
2026-01-24T23:00:00.000Z	26 \| good	2.093 \| good	8.543 \| good	28.219 \| good	1.13 \| good	6.647 \| good	0.152 \| good
2026-01-25T00:00:00.000Z	25 \| good	2.259 \| good	9.47 \| good	27.077 \| good	1.134 \| good	7.335 \| good	0.153 \| good
2026-01-25T01:00:00.000Z	19 \| good	1.655 \| good	6.71 \| good	19.668 \| good	1.28 \| good	13.876 \| good	0.188 \| good
2026-01-25T02:00:00.000Z	22 \| good	3.836 \| good	16.927 \| good	13.793 \| good	1.426 \| good	20.416 \| good	0.222 \| good
2026-01-25T03:00:00.000Z	27 \| good	5.016 \| good	21.755 \| good	10.124 \| good	1.572 \| good	26.956 \| good	0.257 \| good
2026-01-25T04:00:00.000Z	33 \| good	5.687 \| good	24.519 \| good	7.835 \| good	1.65 \| good	28.248 \| good	0.268 \| good
2026-01-25T05:00:00.000Z	38 \| good	6.632 \| good	29.142 \| good	8.041 \| good	1.729 \| good	29.539 \| good	0.278 \| good
2026-01-25T06:00:00.000Z	33 \| good	5.598 \| good	24.324 \| good	8.623 \| good	1.808 \| good	30.831 \| good	0.289 \| good
2026-01-25T07:00:00.000Z	33 \| good	5.664 \| good	24.394 \| good	7.389 \| good	1.615 \| good	29.9 \| good	0.286 \| good
2026-01-25T08:00:00.000Z	38 \| good	6.514 \| good	28.989 \| good	7.14 \| good	1.423 \| good	28.968 \| good	0.283 \| good
2026-01-25T09:00:00.000Z	44 \| good	7.999 \| good	35.111 \| good	6.062 \| good	1.231 \| good	28.037 \| good	0.28 \| good
2026-01-25T10:00:00.000Z	44 \| good	7.765 \| good	34.059 \| good	5.075 \| good	1.124 \| good	26.629 \| good	0.27 \| good
2026-01-25T11:00:00.000Z	52 \| moderate	9.528 \| good	42.451 \| good	6.027 \| good	1.017 \| good	25.221 \| good	0.26 \| good
2026-01-25T12:00:00.000Z	44 \| good	8.358 \| good	36.82 \| good	5.776 \| good	0.91 \| good	23.812 \| good	0.25 \| good
2026-01-25T13:00:00.000Z	38 \| good	7.46 \| good	32.605 \| good	5.961 \| good	0.984 \| good	23.354 \| good	0.245 \| good
2026-01-25T14:00:00.000Z	27 \| good	5.137 \| good	22.317 \| good	5.984 \| good	1.058 \| good	22.896 \| good	0.24 \| good
2026-01-25T15:00:00.000Z	27 \| good	5.389 \| good	23.388 \| good	5.847 \| good	1.133 \| good	22.437 \| good	0.235 \| good
2026-01-25T16:00:00.000Z	33 \| good	5.943 \| good	26.055 \| good	6.683 \| good	1.248 \| good	20.821 \| good	0.249 \| good
2026-01-25T17:00:00.000Z	54 \| moderate	10.774 \| good	47.797 \| good	10.084 \| good	1.363 \| good	19.205 \| good	0.263 \| good
2026-01-25T18:00:00.000Z	52 \| moderate	10.092 \| good	44.495 \| good	13.904 \| good	1.478 \| good	17.589 \| good	0.278 \| good
2026-01-25T19:00:00.000Z	52 \| moderate	10.352 \| good	46.128 \| good	16.312 \| good	1.584 \| good	15.951 \| good	0.259 \| good
2026-01-25T20:00:00.000Z	52 \| moderate	10.191 \| good	45.004 \| good	18.23 \| good	1.69 \| good	14.313 \| good	0.241 \| good
2026-01-25T21:00:00.000Z	52 \| moderate	9.76 \| good	43.516 \| good	19.207 \| good	1.796 \| good	12.675 \| good	0.223 \| good
2026-01-25T22:00:00.000Z	49 \| good	9.135 \| good	40.455 \| good	21.526 \| good	1.825 \| good	13.619 \| good	0.227 \| good
2026-01-25T23:00:00.000Z	54 \| moderate	10.961 \| good	48.78 \| good	21.781 \| good	1.855 \| good	14.564 \| good	0.231 \| good

San Mateo

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

0.48ppm

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 12:00:00 on 2026-01-23.

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 06:00:00 on 2026-01-23.

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

The current air quality in San Mateo, California is 60, categorized as Moderate 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 13.917 μg/m³.

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

The current PM₁₀ concentration at San Mateo, California is 55.249 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 0.397 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 0.724 ppb.

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

The current ozone (O₃) concentration at San Mateo, California is 14.515 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 10.044 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-01-22T00:00:00.000Z	58 \| moderate	12.851 \| fine	56.947 \| fine	8.849 \| good	0.869 \| good	16.913 \| good	0.543 \| good
2026-01-22T01:00:00.000Z	60 \| moderate	13.61 \| fine	60.707 \| fine	8.868 \| good	0.835 \| good	19.045 \| good	0.595 \| good
2026-01-22T02:00:00.000Z	60 \| moderate	14.05 \| fine	62.896 \| fine	6.675 \| good	0.773 \| good	19.285 \| good	0.637 \| good
2026-01-22T03:00:00.000Z	60 \| moderate	13.996 \| fine	62.359 \| fine	5.108 \| good	0.813 \| good	20.263 \| good	0.608 \| good
2026-01-22T04:00:00.000Z	58 \| moderate	12.9 \| fine	57.224 \| fine	5.496 \| good	0.78 \| good	20.815 \| good	0.542 \| good
2026-01-22T05:00:00.000Z	58 \| moderate	13.445 \| fine	59.171 \| fine	5.455 \| good	0.78 \| good	21.33 \| good	0.597 \| good
2026-01-22T06:00:00.000Z	62 \| moderate	14.504 \| fine	63.603 \| fine	3.422 \| good	0.845 \| good	19.883 \| good	0.793 \| good
2026-01-22T07:00:00.000Z	62 \| moderate	14.623 \| fine	65.088 \| fine	5.993 \| good	0.829 \| good	20.963 \| good	0.809 \| good
2026-01-22T08:00:00.000Z	62 \| moderate	14.528 \| fine	62.273 \| fine	5.675 \| good	0.903 \| good	19.032 \| good	0.778 \| good
2026-01-22T09:00:00.000Z	60 \| moderate	13.577 \| fine	61.479 \| fine	4.56 \| good	0.831 \| good	18.374 \| good	0.68 \| good
2026-01-22T10:00:00.000Z	60 \| moderate	14.191 \| fine	60.933 \| fine	5.692 \| good	0.84 \| good	16.615 \| good	0.593 \| good
2026-01-22T11:00:00.000Z	58 \| moderate	12.745 \| fine	56.488 \| fine	4.729 \| good	0.807 \| good	16.012 \| good	0.599 \| good
2026-01-22T12:00:00.000Z	58 \| moderate	12.676 \| fine	55.536 \| fine	4.32 \| good	0.783 \| good	15.71 \| good	0.599 \| good
2026-01-22T13:00:00.000Z	56 \| moderate	12.449 \| fine	55.666 \| fine	3.576 \| good	0.792 \| good	16.136 \| good	0.614 \| good
2026-01-22T14:00:00.000Z	56 \| moderate	12.437 \| fine	53.718 \| good	3.796 \| good	0.755 \| good	14.452 \| good	0.596 \| good
2026-01-22T15:00:00.000Z	54 \| moderate	11.077 \| good	50.057 \| good	3.208 \| good	0.787 \| good	13.633 \| good	0.75 \| good
2026-01-22T16:00:00.000Z	54 \| moderate	11.369 \| good	50.523 \| good	2.605 \| good	0.76 \| good	17.049 \| good	0.984 \| good
2026-01-22T17:00:00.000Z	52 \| moderate	10.216 \| good	45.486 \| good	3.237 \| good	0.82 \| good	16.873 \| good	0.859 \| good
2026-01-22T18:00:00.000Z	64 \| moderate	15.777 \| fine	68.05 \| fine	4.322 \| good	0.955 \| good	13.086 \| good	0.592 \| good
2026-01-22T19:00:00.000Z	64 \| moderate	16.35 \| fine	72.966 \| fine	5.613 \| good	0.924 \| good	13.027 \| good	0.577 \| good
2026-01-22T20:00:00.000Z	64 \| moderate	16.163 \| fine	69.887 \| fine	5.94 \| good	1.065 \| good	13.576 \| good	0.562 \| good
2026-01-22T21:00:00.000Z	64 \| moderate	16.079 \| fine	68.858 \| fine	6.924 \| good	0.977 \| good	13.108 \| good	0.557 \| good
2026-01-22T22:00:00.000Z	62 \| moderate	14.956 \| fine	63.939 \| fine	9.356 \| good	0.79 \| good	12.253 \| good	0.455 \| good
2026-01-22T23:00:00.000Z	60 \| moderate	13.677 \| fine	61.457 \| fine	13.333 \| good	0.951 \| good	12.771 \| good	0.463 \| good
2026-01-23T00:00:00.000Z	60 \| moderate	13.78 \| fine	59.605 \| fine	16.068 \| good	0.896 \| good	11.828 \| good	0.463 \| good
2026-01-23T01:00:00.000Z	56 \| moderate	12.432 \| fine	55.033 \| fine	17.931 \| good	0.816 \| good	14.647 \| good	0.428 \| good
2026-01-23T02:00:00.000Z	58 \| moderate	12.585 \| fine	56.892 \| fine	17.88 \| good	1.324 \| good	16.213 \| good	0.508 \| good
2026-01-23T03:00:00.000Z	54 \| moderate	11.375 \| good	49.631 \| good	15.098 \| good	0.839 \| good	18.798 \| good	0.493 \| good
2026-01-23T04:00:00.000Z	54 \| moderate	10.935 \| good	48.019 \| good	14.202 \| good	0.685 \| good	17.863 \| good	0.551 \| good
2026-01-23T05:00:00.000Z	54 \| moderate	10.842 \| good	46.997 \| good	13.106 \| good	0.59 \| good	17.519 \| good	0.632 \| good
2026-01-23T06:00:00.000Z	56 \| moderate	11.66 \| good	50.374 \| good	9.813 \| good	0.502 \| good	16.847 \| good	0.614 \| good
2026-01-23T07:00:00.000Z	54 \| moderate	11.201 \| good	50.689 \| good	6.561 \| good	0.437 \| good	18.505 \| good	0.645 \| good
2026-01-23T08:00:00.000Z	58 \| moderate	12.787 \| fine	56.28 \| fine	5.833 \| good	0.453 \| good	15.202 \| good	0.568 \| good
2026-01-23T09:00:00.000Z	58 \| moderate	13.439 \| fine	56.621 \| fine	5.133 \| good	0.495 \| good	14.141 \| good	0.504 \| good
2026-01-23T10:00:00.000Z	56 \| moderate	12.5 \| fine	53.841 \| good	4.474 \| good	0.571 \| good	12.058 \| good	0.517 \| good
2026-01-23T11:00:00.000Z	58 \| moderate	12.801 \| fine	58.636 \| fine	4.291 \| good	0.55 \| good	11.492 \| good	0.459 \| good
2026-01-23T12:00:00.000Z	54 \| moderate	11.146 \| good	48.814 \| good	9.674 \| good	0.384 \| good	11.196 \| good	0.458 \| good
2026-01-23T13:00:00.000Z	54 \| moderate	10.972 \| good	48.621 \| good	5.903 \| good	0.926 \| good	10.899 \| good	0.411 \| good
2026-01-23T14:00:00.000Z	52 \| moderate	9.72 \| good	42.696 \| good	5.2 \| good	0.931 \| good	11.821 \| good	0.411 \| good
2026-01-23T15:00:00.000Z	52 \| moderate	9.752 \| good	42.668 \| good	6.302 \| good	0.896 \| good	14.016 \| good	0.476 \| good
2026-01-23T16:00:00.000Z	49 \| good	8.949 \| good	38.215 \| good	7.652 \| good	0.749 \| good	14.166 \| good	0.476 \| good
2026-01-23T17:00:00.000Z	49 \| good	8.96 \| good	41.843 \| good	8.492 \| good	0.659 \| good	11.214 \| good	0.407 \| good
2026-01-23T18:00:00.000Z	49 \| good	9.171 \| good	40.142 \| good	10.483 \| good	0.65 \| good	10.988 \| good	0.401 \| good
2026-01-23T19:00:00.000Z	54 \| moderate	11.32 \| good	51.301 \| good	11.82 \| good	0.813 \| good	7.545 \| good	0.415 \| good
2026-01-23T20:00:00.000Z	58 \| moderate	12.525 \| fine	55.401 \| fine	13.965 \| good	1.007 \| good	8.673 \| good	0.411 \| good
2026-01-23T21:00:00.000Z	56 \| moderate	11.967 \| good	54.39 \| good	15.569 \| good	0.822 \| good	8.388 \| good	0.418 \| good
2026-01-23T22:00:00.000Z	58 \| moderate	12.841 \| fine	56.852 \| fine	17.706 \| good	0.732 \| good	8.38 \| good	0.437 \| good
2026-01-23T23:00:00.000Z	58 \| moderate	12.688 \| fine	55.83 \| fine	17.829 \| good	0.847 \| good	8.013 \| good	0.413 \| good
2026-01-23T23:00:00.000Z	60 \| moderate	13.917 \| fine	55.249 \| fine	14.515 \| good	0.724 \| good	10.044 \| good	0.397 \| good
2026-01-24T00:00:00.000Z	88 \| moderate	28.586 \| fine	124.535 \| fine	16.866 \| good	2.537 \| good	9.078 \| good	0.217 \| good
2026-01-24T01:00:00.000Z	73 \| moderate	20.928 \| fine	91.826 \| fine	12.672 \| good	2.479 \| good	12.381 \| good	0.244 \| good
2026-01-24T02:00:00.000Z	67 \| moderate	17.844 \| fine	79.17 \| fine	17.174 \| good	2.42 \| good	15.683 \| good	0.27 \| good
2026-01-24T03:00:00.000Z	60 \| moderate	14.025 \| fine	63.167 \| fine	20.814 \| good	2.362 \| good	18.986 \| good	0.297 \| good
2026-01-24T04:00:00.000Z	60 \| moderate	13.949 \| fine	63.121 \| fine	21.83 \| good	2.447 \| good	19.915 \| good	0.31 \| good
2026-01-24T05:00:00.000Z	58 \| moderate	13.225 \| fine	59.469 \| fine	20.293 \| good	2.533 \| good	20.843 \| good	0.324 \| good
2026-01-24T06:00:00.000Z	58 \| moderate	13.243 \| fine	59.512 \| fine	17.299 \| good	2.618 \| good	21.772 \| good	0.337 \| good
2026-01-24T07:00:00.000Z	56 \| moderate	12.307 \| fine	55.455 \| fine	15.873 \| good	2.459 \| good	20.937 \| good	0.333 \| good
2026-01-24T08:00:00.000Z	52 \| moderate	10.04 \| good	44.804 \| good	15.889 \| good	2.299 \| good	20.101 \| good	0.33 \| good
2026-01-24T09:00:00.000Z	52 \| moderate	9.853 \| good	43.778 \| good	13.316 \| good	2.14 \| good	19.266 \| good	0.326 \| good
2026-01-24T10:00:00.000Z	44 \| good	8.347 \| good	36.388 \| good	11.807 \| good	2.129 \| good	19.377 \| good	0.325 \| good
2026-01-24T11:00:00.000Z	52 \| moderate	9.511 \| good	42.038 \| good	10.793 \| good	2.118 \| good	19.488 \| good	0.324 \| good
2026-01-24T12:00:00.000Z	54 \| moderate	10.815 \| good	47.769 \| good	7.671 \| good	2.108 \| good	19.599 \| good	0.323 \| good
2026-01-24T13:00:00.000Z	58 \| moderate	12.52 \| fine	55.619 \| fine	6.445 \| good	2.277 \| good	20.338 \| good	0.312 \| good
2026-01-24T14:00:00.000Z	58 \| moderate	13.086 \| fine	58.663 \| fine	3.919 \| good	2.446 \| good	21.076 \| good	0.302 \| good
2026-01-24T15:00:00.000Z	66 \| moderate	17.009 \| fine	75.019 \| fine	3.059 \| good	2.615 \| good	21.815 \| good	0.292 \| good
2026-01-24T16:00:00.000Z	64 \| moderate	16.13 \| fine	71.18 \| fine	7.452 \| good	2.41 \| good	19.643 \| good	0.28 \| good
2026-01-24T17:00:00.000Z	66 \| moderate	16.617 \| fine	73.382 \| fine	14.416 \| good	2.206 \| good	17.471 \| good	0.268 \| good
2026-01-24T18:00:00.000Z	58 \| moderate	13.369 \| fine	60.427 \| fine	20.248 \| good	2.002 \| good	15.299 \| good	0.255 \| good
2026-01-24T19:00:00.000Z	56 \| moderate	12.405 \| fine	55.06 \| fine	21.322 \| good	1.708 \| good	11.956 \| good	0.221 \| good
2026-01-24T20:00:00.000Z	49 \| good	8.716 \| good	38.021 \| good	24.037 \| good	1.415 \| good	8.613 \| good	0.186 \| good
2026-01-24T21:00:00.000Z	33 \| good	5.844 \| good	26.323 \| good	26.552 \| good	1.121 \| good	5.27 \| good	0.151 \| good
2026-01-24T22:00:00.000Z	27 \| good	2.757 \| good	11.664 \| good	28.691 \| good	1.125 \| good	5.958 \| good	0.151 \| good
2026-01-24T23:00:00.000Z	26 \| good	2.093 \| good	8.543 \| good	28.219 \| good	1.13 \| good	6.647 \| good	0.152 \| good
2026-01-25T00:00:00.000Z	25 \| good	2.259 \| good	9.47 \| good	27.077 \| good	1.134 \| good	7.335 \| good	0.153 \| good
2026-01-25T01:00:00.000Z	19 \| good	1.655 \| good	6.71 \| good	19.668 \| good	1.28 \| good	13.876 \| good	0.188 \| good
2026-01-25T02:00:00.000Z	22 \| good	3.836 \| good	16.927 \| good	13.793 \| good	1.426 \| good	20.416 \| good	0.222 \| good
2026-01-25T03:00:00.000Z	27 \| good	5.016 \| good	21.755 \| good	10.124 \| good	1.572 \| good	26.956 \| good	0.257 \| good
2026-01-25T04:00:00.000Z	33 \| good	5.687 \| good	24.519 \| good	7.835 \| good	1.65 \| good	28.248 \| good	0.268 \| good
2026-01-25T05:00:00.000Z	38 \| good	6.632 \| good	29.142 \| good	8.041 \| good	1.729 \| good	29.539 \| good	0.278 \| good
2026-01-25T06:00:00.000Z	33 \| good	5.598 \| good	24.324 \| good	8.623 \| good	1.808 \| good	30.831 \| good	0.289 \| good
2026-01-25T07:00:00.000Z	33 \| good	5.664 \| good	24.394 \| good	7.389 \| good	1.615 \| good	29.9 \| good	0.286 \| good
2026-01-25T08:00:00.000Z	38 \| good	6.514 \| good	28.989 \| good	7.14 \| good	1.423 \| good	28.968 \| good	0.283 \| good
2026-01-25T09:00:00.000Z	44 \| good	7.999 \| good	35.111 \| good	6.062 \| good	1.231 \| good	28.037 \| good	0.28 \| good
2026-01-25T10:00:00.000Z	44 \| good	7.765 \| good	34.059 \| good	5.075 \| good	1.124 \| good	26.629 \| good	0.27 \| good
2026-01-25T11:00:00.000Z	52 \| moderate	9.528 \| good	42.451 \| good	6.027 \| good	1.017 \| good	25.221 \| good	0.26 \| good
2026-01-25T12:00:00.000Z	44 \| good	8.358 \| good	36.82 \| good	5.776 \| good	0.91 \| good	23.812 \| good	0.25 \| good
2026-01-25T13:00:00.000Z	38 \| good	7.46 \| good	32.605 \| good	5.961 \| good	0.984 \| good	23.354 \| good	0.245 \| good
2026-01-25T14:00:00.000Z	27 \| good	5.137 \| good	22.317 \| good	5.984 \| good	1.058 \| good	22.896 \| good	0.24 \| good
2026-01-25T15:00:00.000Z	27 \| good	5.389 \| good	23.388 \| good	5.847 \| good	1.133 \| good	22.437 \| good	0.235 \| good
2026-01-25T16:00:00.000Z	33 \| good	5.943 \| good	26.055 \| good	6.683 \| good	1.248 \| good	20.821 \| good	0.249 \| good
2026-01-25T17:00:00.000Z	54 \| moderate	10.774 \| good	47.797 \| good	10.084 \| good	1.363 \| good	19.205 \| good	0.263 \| good
2026-01-25T18:00:00.000Z	52 \| moderate	10.092 \| good	44.495 \| good	13.904 \| good	1.478 \| good	17.589 \| good	0.278 \| good
2026-01-25T19:00:00.000Z	52 \| moderate	10.352 \| good	46.128 \| good	16.312 \| good	1.584 \| good	15.951 \| good	0.259 \| good
2026-01-25T20:00:00.000Z	52 \| moderate	10.191 \| good	45.004 \| good	18.23 \| good	1.69 \| good	14.313 \| good	0.241 \| good
2026-01-25T21:00:00.000Z	52 \| moderate	9.76 \| good	43.516 \| good	19.207 \| good	1.796 \| good	12.675 \| good	0.223 \| good
2026-01-25T22:00:00.000Z	49 \| good	9.135 \| good	40.455 \| good	21.526 \| good	1.825 \| good	13.619 \| good	0.227 \| good
2026-01-25T23:00:00.000Z	54 \| moderate	10.961 \| good	48.78 \| good	21.781 \| good	1.855 \| good	14.564 \| good	0.231 \| 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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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?

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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?

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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?

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