What is the sulfur dioxide (SO2) level in Castro Valley, California at the moment?

Currently, Castro Valley, California has a sulfur dioxide (SO2) concentration of 0.513 ppb.

What is the ozone (O3) level in Castro Valley, California at the moment?

The current ozone (O3) level in Castro Valley, California at the moment is 7.482 ppm.

What is the nitrogen dioxide (NO2) level in Castro Valley, California at the moment?

Nitrogen dioxide (NO2) level in Castro Valley, California at the moment is 3.39 ppb.

Live air quality index in Castro Valley, California today

Q: What is the PM2.5 level in Castro Valley, California at the moment?

PM2.5 levels in Castro Valley, California are currently 12.937 μg/m3.

Q: What is the PM10 level in Castro Valley, California at the moment?

The PM10 concentration in Castro Valley, California is 48.248 μg/m3 at the moment.

Stay updated with real-time air quality in Castro Valley, 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

Castro Valley, California

Last updated: ... (Local time)

Major air pollutants in Castro Valley, California

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

12.94 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

48.25 μg/m³

155

255

425

605+

Ozone (O₃)

7.48 ppb

201

201+

Sulfur Dioxide (SO₂)

0.51 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

3.39 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.25 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Castro Valley, California

Get Live Pollen Counts

Castro Valley, California

Scroll To Air Quality Map

Track live Castro Valley, California air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-12-05T13:00:00.000Z	64 \| moderate	15.551 \| fine	43.661 \| good	32 \| good	0.647 \| good	12.447 \| good	0.34 \| good
2025-12-05T14:00:00.000Z	67 \| moderate	18.081 \| fine	69.97 \| fine	28 \| good	0.451 \| good	13.283 \| good	0.413 \| good
2025-12-05T15:00:00.000Z	66 \| moderate	16.909 \| fine	41.344 \| good	26 \| good	0.47 \| good	13.377 \| good	0.457 \| good
2025-12-05T16:00:00.000Z	72 \| moderate	16.911 \| fine	97.316 \| fine	26 \| good	0.426 \| good	11.976 \| good	0.554 \| good
2025-12-05T17:00:00.000Z	54 \| moderate	11.385 \| good	41.171 \| good	25 \| good	0.424 \| good	11.884 \| good	0.749 \| good
2025-12-05T18:00:00.000Z	52 \| moderate	10.282 \| good	38.58 \| good	23 \| good	0.467 \| good	12.436 \| good	0.44 \| good
2025-12-05T19:00:00.000Z	58 \| moderate	13.469 \| fine	32.981 \| good	22 \| good	0.484 \| good	12.3 \| good	0.415 \| good
2025-12-05T20:00:00.000Z	58 \| moderate	12.816 \| fine	46.374 \| good	19 \| good	0.437 \| good	11.409 \| good	0.364 \| good
2025-12-05T21:00:00.000Z	56 \| moderate	11.77 \| good	50.309 \| good	18 \| good	0.415 \| good	10.05 \| good	0.349 \| good
2025-12-05T22:00:00.000Z	58 \| moderate	13.051 \| fine	59.205 \| fine	17 \| good	0.521 \| good	10.291 \| good	0.299 \| good
2025-12-05T23:00:00.000Z	58 \| moderate	12.92 \| fine	46.417 \| good	15 \| good	0.469 \| good	11.931 \| good	0.299 \| good
2025-12-06T00:00:00.000Z	66 \| moderate	17.336 \| fine	73.632 \| fine	14 \| good	0.503 \| good	10.867 \| good	0.286 \| good
2025-12-06T01:00:00.000Z	60 \| moderate	14.441 \| fine	60.979 \| fine	13 \| good	0.441 \| good	13.403 \| good	0.32 \| good
2025-12-06T02:00:00.000Z	60 \| moderate	14.242 \| fine	34.546 \| good	12 \| good	0.423 \| good	15.308 \| good	0.34 \| good
2025-12-06T03:00:00.000Z	73 \| moderate	21.23 \| fine	71.259 \| fine	9 \| good	0.368 \| good	21.775 \| good	0.452 \| good
2025-12-06T04:00:00.000Z	75 \| moderate	22.3 \| fine	82.839 \| fine	13 \| good	0.424 \| good	18 \| good	0.476 \| good
2025-12-06T05:00:00.000Z	71 \| moderate	19.693 \| fine	91.124 \| fine	13 \| good	0.432 \| good	15.449 \| good	0.525 \| good
2025-12-06T06:00:00.000Z	77 \| moderate	23.066 \| fine	96.534 \| fine	14 \| good	0.45 \| good	15.6 \| good	0.569 \| good
2025-12-06T07:00:00.000Z	82 \| moderate	24.186 \| fine	117.072 \| fine	12 \| good	0.502 \| good	14.833 \| good	0.51 \| good
2025-12-06T08:00:00.000Z	81 \| moderate	24.754 \| fine	90.597 \| fine	12 \| good	0.41 \| good	14.773 \| good	0.41 \| good
2025-12-06T09:00:00.000Z	79 \| moderate	23.98 \| fine	83.414 \| fine	12 \| good	0.416 \| good	15.094 \| good	0.41 \| good
2025-12-06T10:00:00.000Z	73 \| moderate	20.913 \| fine	83.425 \| fine	12 \| good	0.915 \| good	20.822 \| good	0.421 \| good
2025-12-06T11:00:00.000Z	60 \| moderate	13.754 \| fine	44.283 \| good	12 \| good	0.86 \| good	19.95 \| good	0.375 \| good
2025-12-06T12:00:00.000Z	64 \| moderate	16.187 \| fine	65.853 \| fine	16.892 \| good	0.38 \| good	6.826 \| good	0.349 \| good
2025-12-06T13:00:00.000Z	49 \| good	8.993 \| good	29.679 \| good	8 \| good	0.377 \| good	6.171 \| good	0.259 \| good
2025-12-06T14:00:00.000Z	62 \| moderate	14.522 \| fine	31.387 \| good	11 \| good	0.487 \| good	6.33 \| good	0.183 \| good
2025-12-06T15:00:00.000Z	62 \| moderate	15.098 \| fine	38.682 \| good	9 \| good	0.403 \| good	9.307 \| good	0.232 \| good
2025-12-06T16:00:00.000Z	58 \| moderate	12.986 \| fine	58.716 \| fine	9 \| good	0.387 \| good	6.742 \| good	0.245 \| good
2025-12-06T17:00:00.000Z	60 \| moderate	13.524 \| fine	47.816 \| good	9 \| good	0.443 \| good	7.018 \| good	0.266 \| good
2025-12-06T18:00:00.000Z	64 \| moderate	15.829 \| fine	55.352 \| fine	8 \| good	0.495 \| good	6.934 \| good	0.334 \| good
2025-12-06T19:00:00.000Z	54 \| moderate	10.935 \| good	50.048 \| good	10 \| good	0.495 \| good	6.406 \| good	0.328 \| good
2025-12-06T20:00:00.000Z	54 \| moderate	11.275 \| good	40.441 \| good	11 \| good	0.485 \| good	5.95 \| good	0.299 \| good
2025-12-06T21:00:00.000Z	54 \| moderate	10.596 \| good	31.034 \| good	11 \| good	0.544 \| good	6.402 \| good	0.347 \| good
2025-12-06T22:00:00.000Z	66 \| moderate	17.271 \| fine	76.323 \| fine	11 \| good	0.564 \| good	7.253 \| good	0.334 \| good
2025-12-06T23:00:00.000Z	67 \| moderate	18.184 \| fine	72.815 \| fine	13 \| good	0.502 \| good	7.409 \| good	0.314 \| good
2025-12-07T00:00:00.000Z	75 \| moderate	21.619 \| fine	40.532 \| good	14 \| good	0.489 \| good	8.22 \| good	0.314 \| good
2025-12-07T01:00:00.000Z	75 \| moderate	21.797 \| fine	68.814 \| fine	15 \| good	0.447 \| good	6.126 \| good	0.265 \| good
2025-12-07T02:00:00.000Z	75 \| moderate	22.199 \| fine	67.107 \| fine	14 \| good	0.401 \| good	7.314 \| good	0.295 \| good
2025-12-07T03:00:00.000Z	88 \| moderate	28.856 \| fine	88.701 \| fine	11 \| good	0.426 \| good	9.774 \| good	0.299 \| good
2025-12-07T04:00:00.000Z	81 \| moderate	24.522 \| fine	56.291 \| fine	10 \| good	0.391 \| good	12.398 \| good	0.378 \| good
2025-12-07T05:00:00.000Z	84 \| moderate	26.778 \| fine	86.099 \| fine	10 \| good	0.413 \| good	11.961 \| good	0.393 \| good
2025-12-07T06:00:00.000Z	81 \| moderate	24.524 \| fine	59.634 \| fine	8 \| good	0.413 \| good	10.423 \| good	0.413 \| good
2025-12-07T07:00:00.000Z	67 \| moderate	18.46 \| fine	75.303 \| fine	8 \| good	0.411 \| good	9.406 \| good	0.393 \| good
2025-12-07T08:00:00.000Z	69 \| moderate	19.38 \| fine	72.483 \| fine	9 \| good	0.369 \| good	8.412 \| good	0.376 \| good
2025-12-07T09:00:00.000Z	71 \| moderate	19.661 \| fine	78.875 \| fine	9 \| good	0.359 \| good	8.59 \| good	0.376 \| good
2025-12-07T10:00:00.000Z	70 \| moderate	19.247 \| fine	94.394 \| fine	9 \| good	0.495 \| good	6.233 \| good	0.262 \| good
2025-12-07T11:00:00.000Z	44 \| good	8.486 \| good	40.529 \| good	9 \| good	0.517 \| good	3.243 \| good	0.254 \| good
2025-12-07T12:00:00.000Z	54 \| moderate	10.665 \| good	44.782 \| good	9.48 \| good	0.36 \| good	6.617 \| good	0.24 \| good
2025-12-07T12:00:00.000Z	58 \| moderate	12.937 \| fine	48.248 \| good	7.482 \| good	0.513 \| good	3.39 \| good	0.253 \| good
2025-12-07T13:00:00.000Z	27 \| good	4.673 \| good	20.329 \| good	11.29 \| good	1.852 \| good	20.658 \| good	0.479 \| good
2025-12-07T14:00:00.000Z	27 \| good	5.173 \| good	22.736 \| good	12.871 \| good	1.847 \| good	20.874 \| good	0.476 \| good
2025-12-07T15:00:00.000Z	22 \| good	4.176 \| good	18.087 \| good	12.425 \| good	1.842 \| good	21.091 \| good	0.474 \| good
2025-12-07T16:00:00.000Z	27 \| good	4.618 \| good	20.084 \| good	11.697 \| good	2.206 \| good	20.928 \| good	0.465 \| good
2025-12-07T17:00:00.000Z	27 \| good	4.975 \| good	21.292 \| good	13.04 \| good	2.57 \| good	20.766 \| good	0.457 \| good
2025-12-07T18:00:00.000Z	44 \| good	7.56 \| good	33.044 \| good	14.887 \| good	2.934 \| good	20.603 \| good	0.448 \| good
2025-12-07T19:00:00.000Z	54 \| moderate	10.959 \| good	48.392 \| good	16.768 \| good	3.231 \| good	18.86 \| good	0.378 \| good
2025-12-07T20:00:00.000Z	58 \| moderate	13.436 \| fine	60.21 \| fine	17.439 \| good	3.528 \| good	17.116 \| good	0.307 \| good
2025-12-07T21:00:00.000Z	64 \| moderate	15.668 \| fine	70.024 \| fine	14.773 \| good	3.825 \| good	15.373 \| good	0.237 \| good
2025-12-07T22:00:00.000Z	67 \| moderate	18.417 \| fine	81.475 \| fine	13.844 \| good	3.674 \| good	17.205 \| good	0.237 \| good
2025-12-07T23:00:00.000Z	73 \| moderate	20.948 \| fine	92.607 \| fine	10.475 \| good	3.523 \| good	19.037 \| good	0.238 \| good
2025-12-08T00:00:00.000Z	69 \| moderate	19.142 \| fine	84.48 \| fine	6.936 \| good	3.371 \| good	20.869 \| good	0.238 \| good
2025-12-08T01:00:00.000Z	67 \| moderate	17.787 \| fine	78.391 \| fine	4.819 \| good	3.285 \| good	23.269 \| good	0.294 \| good
2025-12-08T02:00:00.000Z	67 \| moderate	18.195 \| fine	80.294 \| fine	5.427 \| good	3.199 \| good	25.669 \| good	0.351 \| good
2025-12-08T03:00:00.000Z	73 \| moderate	20.907 \| fine	91.853 \| fine	5.776 \| good	3.113 \| good	28.069 \| good	0.408 \| good
2025-12-08T04:00:00.000Z	75 \| moderate	21.829 \| fine	95.392 \| fine	5.598 \| good	3.385 \| good	27.923 \| good	0.42 \| good
2025-12-08T05:00:00.000Z	77 \| moderate	22.639 \| fine	98.986 \| fine	5.598 \| good	3.656 \| good	27.777 \| good	0.432 \| good
2025-12-08T06:00:00.000Z	77 \| moderate	23.154 \| fine	101.831 \| fine	4.847 \| good	3.928 \| good	27.631 \| good	0.443 \| good
2025-12-08T07:00:00.000Z	77 \| moderate	22.983 \| fine	100.973 \| fine	4.03 \| good	3.722 \| good	26.5 \| good	0.437 \| good
2025-12-08T08:00:00.000Z	73 \| moderate	21.289 \| fine	93.66 \| fine	3.826 \| good	3.515 \| good	25.369 \| good	0.43 \| good
2025-12-08T09:00:00.000Z	71 \| moderate	20.3 \| fine	89.729 \| fine	5.139 \| good	3.308 \| good	24.238 \| good	0.423 \| good
2025-12-08T10:00:00.000Z	69 \| moderate	18.937 \| fine	84.012 \| fine	6.167 \| good	3.154 \| good	23.457 \| good	0.398 \| good
2025-12-08T11:00:00.000Z	66 \| moderate	16.976 \| fine	75.933 \| fine	8.156 \| good	2.999 \| good	22.676 \| good	0.372 \| good
2025-12-08T12:00:00.000Z	66 \| moderate	17.106 \| fine	76.139 \| fine	10.483 \| good	2.845 \| good	21.895 \| good	0.347 \| good
2025-12-08T13:00:00.000Z	62 \| moderate	14.537 \| fine	65.15 \| fine	9.801 \| good	2.695 \| good	21.378 \| good	0.359 \| good
2025-12-08T14:00:00.000Z	62 \| moderate	14.985 \| fine	66.855 \| fine	10.278 \| good	2.546 \| good	20.861 \| good	0.37 \| good
2025-12-08T15:00:00.000Z	60 \| moderate	14.032 \| fine	62.604 \| fine	9.54 \| good	2.396 \| good	20.344 \| good	0.381 \| good
2025-12-08T16:00:00.000Z	62 \| moderate	14.63 \| fine	65.931 \| fine	11.119 \| good	2.585 \| good	19.525 \| good	0.396 \| good
2025-12-08T17:00:00.000Z	62 \| moderate	15.266 \| fine	67.932 \| fine	10.222 \| good	2.773 \| good	18.705 \| good	0.41 \| good
2025-12-08T18:00:00.000Z	66 \| moderate	16.875 \| fine	75.164 \| fine	10.824 \| good	2.961 \| good	17.886 \| good	0.425 \| good
2025-12-08T19:00:00.000Z	67 \| moderate	17.95 \| fine	79.877 \| fine	12.539 \| good	3.373 \| good	16.927 \| good	0.361 \| good
2025-12-08T20:00:00.000Z	66 \| moderate	16.854 \| fine	74.636 \| fine	15.562 \| good	3.784 \| good	15.967 \| good	0.296 \| good
2025-12-08T21:00:00.000Z	67 \| moderate	17.685 \| fine	78.018 \| fine	12.08 \| good	4.196 \| good	15.008 \| good	0.232 \| good
2025-12-08T22:00:00.000Z	69 \| moderate	18.907 \| fine	83.537 \| fine	10.421 \| good	4.044 \| good	16.745 \| good	0.237 \| good
2025-12-08T23:00:00.000Z	71 \| moderate	20.077 \| fine	87.802 \| fine	7.707 \| good	3.891 \| good	18.483 \| good	0.241 \| good
2025-12-09T00:00:00.000Z	69 \| moderate	18.609 \| fine	81.666 \| fine	2.841 \| good	3.739 \| good	20.221 \| good	0.246 \| good
2025-12-09T01:00:00.000Z	66 \| moderate	16.651 \| fine	74.131 \| fine	1.248 \| good	3.863 \| good	23.165 \| good	0.332 \| good
2025-12-09T02:00:00.000Z	64 \| moderate	15.876 \| fine	71.29 \| fine	3.258 \| good	3.987 \| good	26.109 \| good	0.419 \| good
2025-12-09T03:00:00.000Z	60 \| moderate	14.493 \| fine	64.766 \| fine	3.714 \| good	4.111 \| good	29.053 \| good	0.506 \| good
2025-12-09T04:00:00.000Z	58 \| moderate	13.436 \| fine	60.138 \| fine	5.627 \| good	4.274 \| good	28.745 \| good	0.51 \| good
2025-12-09T05:00:00.000Z	58 \| moderate	13.357 \| fine	60.09 \| fine	7.111 \| good	4.436 \| good	28.437 \| good	0.513 \| good
2025-12-09T06:00:00.000Z	107 \| sensitive	37.826 \| moderate	40.398 \| good	1.235 \| good	4.735 \| good	28.701 \| good	0.527 \| good
2025-12-09T07:00:00.000Z	58 \| moderate	12.785 \| fine	57.195 \| fine	8.089 \| good	4.282 \| good	27.148 \| good	0.492 \| good
2025-12-09T08:00:00.000Z	54 \| moderate	11.437 \| good	50.809 \| good	8.454 \| good	3.965 \| good	26.165 \| good	0.468 \| good
2025-12-09T09:00:00.000Z	56 \| moderate	12.494 \| fine	55.585 \| fine	8.365 \| good	3.649 \| good	25.183 \| good	0.444 \| good
2025-12-09T10:00:00.000Z	58 \| moderate	13.372 \| fine	60.177 \| fine	10.444 \| good	3.466 \| good	24.393 \| good	0.409 \| good
2025-12-09T11:00:00.000Z	58 \| moderate	13.423 \| fine	60.256 \| fine	13.313 \| good	3.283 \| good	23.603 \| good	0.374 \| good
2025-12-09T12:00:00.000Z	86 \| moderate	27.581 \| fine	29.796 \| good	5.375 \| good	3.186 \| good	23.283 \| good	0.343 \| good

Castro Valley

Get reliable air quality data to drive your business

Castro Valley, California air quality map: Stay updated on AQI near you

0.25ppm

How accurate is California, USA air quality data?

Air quality and pollutant data for California, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.

Source: Ambee Data Sources

Air quality levels in US

Check live rankings of places in the USA affected by air pollution.

View Polluted Cities

Check live rankings of places in the USA with the cleanest air.

View Clean Cities

Frequently asked questions

How often is air quality information updated for Castro Valley, California?

The air quality information for Castro Valley, California is updated every hour for accuracy.

What time in the last 24 hours was the air quality in Castro Valley, California at its worst?

In the past 24 hours, the air quality in Castro Valley, California was at its worst at 03:00:00 on 2025-12-07.

When did Castro Valley, California experience the best air quality in the last 24 hours?

In the last 24 hours, the best air quality in Castro Valley, California was observed at 11:00:00 on 2025-12-07.

What is the AQI in Castro Valley, California right now?

As of now, the AQI in Castro Valley, California is 58, indicating Moderate conditions.

What is the most common type of pollution in Castro Valley, California?

Castro Valley, California air has the highest levels of PM2.5.

What should I do in case of poor air quality in Castro Valley, California?

Poor air quality in Castro Valley, California means it's advisable to stay indoors and wear a mask for your protection.

What is the PM_2.5 level in Castro Valley, California at the moment?

PM_2.5 levels in Castro Valley, California are currently 12.937 μg/m³.

What is the PM₁₀ level in Castro Valley, California at the moment?

The PM₁₀ concentration in Castro Valley, California is 48.248 μg/m³ at the moment.

What is the carbon monoxide (CO) level in Castro Valley, California at the moment?

The current carbon monoxide (CO) concentration in Castro Valley, California is 0.253 ppm.

What is the sulfur dioxide (SO₂) level in Castro Valley, California at the moment?

Currently, Castro Valley, California has a sulfur dioxide (SO₂) concentration of 0.513 ppb.

What is the ozone (O₃) level in Castro Valley, California at the moment?

The current ozone (O₃) level in Castro Valley, California at the moment is 7.482 ppm.

What is the nitrogen dioxide (NO₂) level in Castro Valley, California at the moment?

Nitrogen dioxide (NO₂) level in Castro Valley, California at the moment is 3.39 ppb.

Certified

APIs

Refund Policy

Historical Climate Data

Terms & Conditions

Refund Policy

Terms & Conditions

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-12-05T13:00:00.000Z	64 \| moderate	15.551 \| fine	43.661 \| good	32 \| good	0.647 \| good	12.447 \| good	0.34 \| good
2025-12-05T14:00:00.000Z	67 \| moderate	18.081 \| fine	69.97 \| fine	28 \| good	0.451 \| good	13.283 \| good	0.413 \| good
2025-12-05T15:00:00.000Z	66 \| moderate	16.909 \| fine	41.344 \| good	26 \| good	0.47 \| good	13.377 \| good	0.457 \| good
2025-12-05T16:00:00.000Z	72 \| moderate	16.911 \| fine	97.316 \| fine	26 \| good	0.426 \| good	11.976 \| good	0.554 \| good
2025-12-05T17:00:00.000Z	54 \| moderate	11.385 \| good	41.171 \| good	25 \| good	0.424 \| good	11.884 \| good	0.749 \| good
2025-12-05T18:00:00.000Z	52 \| moderate	10.282 \| good	38.58 \| good	23 \| good	0.467 \| good	12.436 \| good	0.44 \| good
2025-12-05T19:00:00.000Z	58 \| moderate	13.469 \| fine	32.981 \| good	22 \| good	0.484 \| good	12.3 \| good	0.415 \| good
2025-12-05T20:00:00.000Z	58 \| moderate	12.816 \| fine	46.374 \| good	19 \| good	0.437 \| good	11.409 \| good	0.364 \| good
2025-12-05T21:00:00.000Z	56 \| moderate	11.77 \| good	50.309 \| good	18 \| good	0.415 \| good	10.05 \| good	0.349 \| good
2025-12-05T22:00:00.000Z	58 \| moderate	13.051 \| fine	59.205 \| fine	17 \| good	0.521 \| good	10.291 \| good	0.299 \| good
2025-12-05T23:00:00.000Z	58 \| moderate	12.92 \| fine	46.417 \| good	15 \| good	0.469 \| good	11.931 \| good	0.299 \| good
2025-12-06T00:00:00.000Z	66 \| moderate	17.336 \| fine	73.632 \| fine	14 \| good	0.503 \| good	10.867 \| good	0.286 \| good
2025-12-06T01:00:00.000Z	60 \| moderate	14.441 \| fine	60.979 \| fine	13 \| good	0.441 \| good	13.403 \| good	0.32 \| good
2025-12-06T02:00:00.000Z	60 \| moderate	14.242 \| fine	34.546 \| good	12 \| good	0.423 \| good	15.308 \| good	0.34 \| good
2025-12-06T03:00:00.000Z	73 \| moderate	21.23 \| fine	71.259 \| fine	9 \| good	0.368 \| good	21.775 \| good	0.452 \| good
2025-12-06T04:00:00.000Z	75 \| moderate	22.3 \| fine	82.839 \| fine	13 \| good	0.424 \| good	18 \| good	0.476 \| good
2025-12-06T05:00:00.000Z	71 \| moderate	19.693 \| fine	91.124 \| fine	13 \| good	0.432 \| good	15.449 \| good	0.525 \| good
2025-12-06T06:00:00.000Z	77 \| moderate	23.066 \| fine	96.534 \| fine	14 \| good	0.45 \| good	15.6 \| good	0.569 \| good
2025-12-06T07:00:00.000Z	82 \| moderate	24.186 \| fine	117.072 \| fine	12 \| good	0.502 \| good	14.833 \| good	0.51 \| good
2025-12-06T08:00:00.000Z	81 \| moderate	24.754 \| fine	90.597 \| fine	12 \| good	0.41 \| good	14.773 \| good	0.41 \| good
2025-12-06T09:00:00.000Z	79 \| moderate	23.98 \| fine	83.414 \| fine	12 \| good	0.416 \| good	15.094 \| good	0.41 \| good
2025-12-06T10:00:00.000Z	73 \| moderate	20.913 \| fine	83.425 \| fine	12 \| good	0.915 \| good	20.822 \| good	0.421 \| good
2025-12-06T11:00:00.000Z	60 \| moderate	13.754 \| fine	44.283 \| good	12 \| good	0.86 \| good	19.95 \| good	0.375 \| good
2025-12-06T12:00:00.000Z	64 \| moderate	16.187 \| fine	65.853 \| fine	16.892 \| good	0.38 \| good	6.826 \| good	0.349 \| good
2025-12-06T13:00:00.000Z	49 \| good	8.993 \| good	29.679 \| good	8 \| good	0.377 \| good	6.171 \| good	0.259 \| good
2025-12-06T14:00:00.000Z	62 \| moderate	14.522 \| fine	31.387 \| good	11 \| good	0.487 \| good	6.33 \| good	0.183 \| good
2025-12-06T15:00:00.000Z	62 \| moderate	15.098 \| fine	38.682 \| good	9 \| good	0.403 \| good	9.307 \| good	0.232 \| good
2025-12-06T16:00:00.000Z	58 \| moderate	12.986 \| fine	58.716 \| fine	9 \| good	0.387 \| good	6.742 \| good	0.245 \| good
2025-12-06T17:00:00.000Z	60 \| moderate	13.524 \| fine	47.816 \| good	9 \| good	0.443 \| good	7.018 \| good	0.266 \| good
2025-12-06T18:00:00.000Z	64 \| moderate	15.829 \| fine	55.352 \| fine	8 \| good	0.495 \| good	6.934 \| good	0.334 \| good
2025-12-06T19:00:00.000Z	54 \| moderate	10.935 \| good	50.048 \| good	10 \| good	0.495 \| good	6.406 \| good	0.328 \| good
2025-12-06T20:00:00.000Z	54 \| moderate	11.275 \| good	40.441 \| good	11 \| good	0.485 \| good	5.95 \| good	0.299 \| good
2025-12-06T21:00:00.000Z	54 \| moderate	10.596 \| good	31.034 \| good	11 \| good	0.544 \| good	6.402 \| good	0.347 \| good
2025-12-06T22:00:00.000Z	66 \| moderate	17.271 \| fine	76.323 \| fine	11 \| good	0.564 \| good	7.253 \| good	0.334 \| good
2025-12-06T23:00:00.000Z	67 \| moderate	18.184 \| fine	72.815 \| fine	13 \| good	0.502 \| good	7.409 \| good	0.314 \| good
2025-12-07T00:00:00.000Z	75 \| moderate	21.619 \| fine	40.532 \| good	14 \| good	0.489 \| good	8.22 \| good	0.314 \| good
2025-12-07T01:00:00.000Z	75 \| moderate	21.797 \| fine	68.814 \| fine	15 \| good	0.447 \| good	6.126 \| good	0.265 \| good
2025-12-07T02:00:00.000Z	75 \| moderate	22.199 \| fine	67.107 \| fine	14 \| good	0.401 \| good	7.314 \| good	0.295 \| good
2025-12-07T03:00:00.000Z	88 \| moderate	28.856 \| fine	88.701 \| fine	11 \| good	0.426 \| good	9.774 \| good	0.299 \| good
2025-12-07T04:00:00.000Z	81 \| moderate	24.522 \| fine	56.291 \| fine	10 \| good	0.391 \| good	12.398 \| good	0.378 \| good
2025-12-07T05:00:00.000Z	84 \| moderate	26.778 \| fine	86.099 \| fine	10 \| good	0.413 \| good	11.961 \| good	0.393 \| good
2025-12-07T06:00:00.000Z	81 \| moderate	24.524 \| fine	59.634 \| fine	8 \| good	0.413 \| good	10.423 \| good	0.413 \| good
2025-12-07T07:00:00.000Z	67 \| moderate	18.46 \| fine	75.303 \| fine	8 \| good	0.411 \| good	9.406 \| good	0.393 \| good
2025-12-07T08:00:00.000Z	69 \| moderate	19.38 \| fine	72.483 \| fine	9 \| good	0.369 \| good	8.412 \| good	0.376 \| good
2025-12-07T09:00:00.000Z	71 \| moderate	19.661 \| fine	78.875 \| fine	9 \| good	0.359 \| good	8.59 \| good	0.376 \| good
2025-12-07T10:00:00.000Z	70 \| moderate	19.247 \| fine	94.394 \| fine	9 \| good	0.495 \| good	6.233 \| good	0.262 \| good
2025-12-07T11:00:00.000Z	44 \| good	8.486 \| good	40.529 \| good	9 \| good	0.517 \| good	3.243 \| good	0.254 \| good
2025-12-07T12:00:00.000Z	54 \| moderate	10.665 \| good	44.782 \| good	9.48 \| good	0.36 \| good	6.617 \| good	0.24 \| good
2025-12-07T12:00:00.000Z	58 \| moderate	12.937 \| fine	48.248 \| good	7.482 \| good	0.513 \| good	3.39 \| good	0.253 \| good
2025-12-07T13:00:00.000Z	27 \| good	4.673 \| good	20.329 \| good	11.29 \| good	1.852 \| good	20.658 \| good	0.479 \| good
2025-12-07T14:00:00.000Z	27 \| good	5.173 \| good	22.736 \| good	12.871 \| good	1.847 \| good	20.874 \| good	0.476 \| good
2025-12-07T15:00:00.000Z	22 \| good	4.176 \| good	18.087 \| good	12.425 \| good	1.842 \| good	21.091 \| good	0.474 \| good
2025-12-07T16:00:00.000Z	27 \| good	4.618 \| good	20.084 \| good	11.697 \| good	2.206 \| good	20.928 \| good	0.465 \| good
2025-12-07T17:00:00.000Z	27 \| good	4.975 \| good	21.292 \| good	13.04 \| good	2.57 \| good	20.766 \| good	0.457 \| good
2025-12-07T18:00:00.000Z	44 \| good	7.56 \| good	33.044 \| good	14.887 \| good	2.934 \| good	20.603 \| good	0.448 \| good
2025-12-07T19:00:00.000Z	54 \| moderate	10.959 \| good	48.392 \| good	16.768 \| good	3.231 \| good	18.86 \| good	0.378 \| good
2025-12-07T20:00:00.000Z	58 \| moderate	13.436 \| fine	60.21 \| fine	17.439 \| good	3.528 \| good	17.116 \| good	0.307 \| good
2025-12-07T21:00:00.000Z	64 \| moderate	15.668 \| fine	70.024 \| fine	14.773 \| good	3.825 \| good	15.373 \| good	0.237 \| good
2025-12-07T22:00:00.000Z	67 \| moderate	18.417 \| fine	81.475 \| fine	13.844 \| good	3.674 \| good	17.205 \| good	0.237 \| good
2025-12-07T23:00:00.000Z	73 \| moderate	20.948 \| fine	92.607 \| fine	10.475 \| good	3.523 \| good	19.037 \| good	0.238 \| good
2025-12-08T00:00:00.000Z	69 \| moderate	19.142 \| fine	84.48 \| fine	6.936 \| good	3.371 \| good	20.869 \| good	0.238 \| good
2025-12-08T01:00:00.000Z	67 \| moderate	17.787 \| fine	78.391 \| fine	4.819 \| good	3.285 \| good	23.269 \| good	0.294 \| good
2025-12-08T02:00:00.000Z	67 \| moderate	18.195 \| fine	80.294 \| fine	5.427 \| good	3.199 \| good	25.669 \| good	0.351 \| good
2025-12-08T03:00:00.000Z	73 \| moderate	20.907 \| fine	91.853 \| fine	5.776 \| good	3.113 \| good	28.069 \| good	0.408 \| good
2025-12-08T04:00:00.000Z	75 \| moderate	21.829 \| fine	95.392 \| fine	5.598 \| good	3.385 \| good	27.923 \| good	0.42 \| good
2025-12-08T05:00:00.000Z	77 \| moderate	22.639 \| fine	98.986 \| fine	5.598 \| good	3.656 \| good	27.777 \| good	0.432 \| good
2025-12-08T06:00:00.000Z	77 \| moderate	23.154 \| fine	101.831 \| fine	4.847 \| good	3.928 \| good	27.631 \| good	0.443 \| good
2025-12-08T07:00:00.000Z	77 \| moderate	22.983 \| fine	100.973 \| fine	4.03 \| good	3.722 \| good	26.5 \| good	0.437 \| good
2025-12-08T08:00:00.000Z	73 \| moderate	21.289 \| fine	93.66 \| fine	3.826 \| good	3.515 \| good	25.369 \| good	0.43 \| good
2025-12-08T09:00:00.000Z	71 \| moderate	20.3 \| fine	89.729 \| fine	5.139 \| good	3.308 \| good	24.238 \| good	0.423 \| good
2025-12-08T10:00:00.000Z	69 \| moderate	18.937 \| fine	84.012 \| fine	6.167 \| good	3.154 \| good	23.457 \| good	0.398 \| good
2025-12-08T11:00:00.000Z	66 \| moderate	16.976 \| fine	75.933 \| fine	8.156 \| good	2.999 \| good	22.676 \| good	0.372 \| good
2025-12-08T12:00:00.000Z	66 \| moderate	17.106 \| fine	76.139 \| fine	10.483 \| good	2.845 \| good	21.895 \| good	0.347 \| good
2025-12-08T13:00:00.000Z	62 \| moderate	14.537 \| fine	65.15 \| fine	9.801 \| good	2.695 \| good	21.378 \| good	0.359 \| good
2025-12-08T14:00:00.000Z	62 \| moderate	14.985 \| fine	66.855 \| fine	10.278 \| good	2.546 \| good	20.861 \| good	0.37 \| good
2025-12-08T15:00:00.000Z	60 \| moderate	14.032 \| fine	62.604 \| fine	9.54 \| good	2.396 \| good	20.344 \| good	0.381 \| good
2025-12-08T16:00:00.000Z	62 \| moderate	14.63 \| fine	65.931 \| fine	11.119 \| good	2.585 \| good	19.525 \| good	0.396 \| good
2025-12-08T17:00:00.000Z	62 \| moderate	15.266 \| fine	67.932 \| fine	10.222 \| good	2.773 \| good	18.705 \| good	0.41 \| good
2025-12-08T18:00:00.000Z	66 \| moderate	16.875 \| fine	75.164 \| fine	10.824 \| good	2.961 \| good	17.886 \| good	0.425 \| good
2025-12-08T19:00:00.000Z	67 \| moderate	17.95 \| fine	79.877 \| fine	12.539 \| good	3.373 \| good	16.927 \| good	0.361 \| good
2025-12-08T20:00:00.000Z	66 \| moderate	16.854 \| fine	74.636 \| fine	15.562 \| good	3.784 \| good	15.967 \| good	0.296 \| good
2025-12-08T21:00:00.000Z	67 \| moderate	17.685 \| fine	78.018 \| fine	12.08 \| good	4.196 \| good	15.008 \| good	0.232 \| good
2025-12-08T22:00:00.000Z	69 \| moderate	18.907 \| fine	83.537 \| fine	10.421 \| good	4.044 \| good	16.745 \| good	0.237 \| good
2025-12-08T23:00:00.000Z	71 \| moderate	20.077 \| fine	87.802 \| fine	7.707 \| good	3.891 \| good	18.483 \| good	0.241 \| good
2025-12-09T00:00:00.000Z	69 \| moderate	18.609 \| fine	81.666 \| fine	2.841 \| good	3.739 \| good	20.221 \| good	0.246 \| good
2025-12-09T01:00:00.000Z	66 \| moderate	16.651 \| fine	74.131 \| fine	1.248 \| good	3.863 \| good	23.165 \| good	0.332 \| good
2025-12-09T02:00:00.000Z	64 \| moderate	15.876 \| fine	71.29 \| fine	3.258 \| good	3.987 \| good	26.109 \| good	0.419 \| good
2025-12-09T03:00:00.000Z	60 \| moderate	14.493 \| fine	64.766 \| fine	3.714 \| good	4.111 \| good	29.053 \| good	0.506 \| good
2025-12-09T04:00:00.000Z	58 \| moderate	13.436 \| fine	60.138 \| fine	5.627 \| good	4.274 \| good	28.745 \| good	0.51 \| good
2025-12-09T05:00:00.000Z	58 \| moderate	13.357 \| fine	60.09 \| fine	7.111 \| good	4.436 \| good	28.437 \| good	0.513 \| good
2025-12-09T06:00:00.000Z	107 \| sensitive	37.826 \| moderate	40.398 \| good	1.235 \| good	4.735 \| good	28.701 \| good	0.527 \| good
2025-12-09T07:00:00.000Z	58 \| moderate	12.785 \| fine	57.195 \| fine	8.089 \| good	4.282 \| good	27.148 \| good	0.492 \| good
2025-12-09T08:00:00.000Z	54 \| moderate	11.437 \| good	50.809 \| good	8.454 \| good	3.965 \| good	26.165 \| good	0.468 \| good
2025-12-09T09:00:00.000Z	56 \| moderate	12.494 \| fine	55.585 \| fine	8.365 \| good	3.649 \| good	25.183 \| good	0.444 \| good
2025-12-09T10:00:00.000Z	58 \| moderate	13.372 \| fine	60.177 \| fine	10.444 \| good	3.466 \| good	24.393 \| good	0.409 \| good
2025-12-09T11:00:00.000Z	58 \| moderate	13.423 \| fine	60.256 \| fine	13.313 \| good	3.283 \| good	23.603 \| good	0.374 \| good
2025-12-09T12:00:00.000Z	86 \| moderate	27.581 \| fine	29.796 \| good	5.375 \| good	3.186 \| good	23.283 \| good	0.343 \| good

Live air quality index in Castro Valley, California today

Major air pollutants in Castro Valley, California

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Castro Valley, California air quality forecast and history

Get reliable air quality data to drive your business

Castro Valley, California air quality map: Stay updated on AQI near you

Air quality in nearby cities

Fairview, California

Hayward, California

Cherryland, California

Ashland, California

San Lorenzo, California

San Leandro, California

How accurate is California, USA air quality data?

Air quality levels in US

Frequently asked questions

How often is air quality information updated for Castro Valley, California?

What time in the last 24 hours was the air quality in Castro Valley, California at its worst?

When did Castro Valley, California experience the best air quality in the last 24 hours?

What is the AQI in Castro Valley, California right now?

What is the most common type of pollution in Castro Valley, California?

What should I do in case of poor air quality in Castro Valley, California?

What is the PM2.5 level in Castro Valley, California at the moment?

What is the PM10 level in Castro Valley, California at the moment?

What is the carbon monoxide (CO) level in Castro Valley, California at the moment?

What is the sulfur dioxide (SO2) level in Castro Valley, California at the moment?

What is the ozone (O3) level in Castro Valley, California at the moment?

What is the nitrogen dioxide (NO2) level in Castro Valley, California at the moment?

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What is the PM_2.5 level in Castro Valley, California at the moment?

What is the PM₁₀ level in Castro Valley, California at the moment?

What is the sulfur dioxide (SO₂) level in Castro Valley, California at the moment?

What is the ozone (O₃) level in Castro Valley, California at the moment?

What is the nitrogen dioxide (NO₂) level in Castro Valley, California at the moment?