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 0.361 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 19.661 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 2.123 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 4.55 μg/m3.

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

The PM10 concentration in Castro Valley, California is 19.146 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)

Good

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)

4.55 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

19.15 μg/m³

155

255

425

605+

Ozone (O₃)

19.66 ppb

201

201+

Sulfur Dioxide (SO₂)

0.36 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

2.12 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.28 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
2026-07-26T11:00:00.000Z	33 \| good	5.741 \| good	23.162 \| good	18.155 \| good	0.495 \| good	3.062 \| good	0.13 \| good
2026-07-26T12:00:00.000Z	22 \| good	4.285 \| good	18.569 \| good	23.032 \| good	0.236 \| good	0.718 \| good	0.21 \| good
2026-07-26T13:00:00.000Z	22 \| good	4.228 \| good	18.229 \| good	18.637 \| good	0.322 \| good	1.169 \| good	0.218 \| good
2026-07-26T14:00:00.000Z	22 \| good	3.679 \| good	15.404 \| good	17.832 \| good	0.313 \| good	1.681 \| good	0.208 \| good
2026-07-26T15:00:00.000Z	22 \| good	4.148 \| good	18.162 \| good	17.933 \| good	0.364 \| good	1.507 \| good	0.211 \| good
2026-07-26T16:00:00.000Z	22 \| good	3.91 \| good	17.091 \| good	18.125 \| good	0.35 \| good	1.339 \| good	0.277 \| good
2026-07-26T17:00:00.000Z	17 \| good	3.409 \| good	14.615 \| good	17.929 \| good	0.406 \| good	1.268 \| good	0.277 \| good
2026-07-26T18:00:00.000Z	22 \| good	3.512 \| good	15.16 \| good	18.52 \| good	0.384 \| good	1.245 \| good	0.281 \| good
2026-07-26T19:00:00.000Z	22 \| good	3.673 \| good	15.798 \| good	18.787 \| good	0.395 \| good	1.14 \| good	0.285 \| good
2026-07-26T20:00:00.000Z	18 \| good	2.917 \| good	13.579 \| good	18.976 \| good	0.391 \| good	1.107 \| good	0.281 \| good
2026-07-26T21:00:00.000Z	19 \| good	2.028 \| good	7.62 \| good	19.956 \| good	0.379 \| good	1.049 \| good	0.285 \| good
2026-07-26T22:00:00.000Z	19 \| good	1.902 \| good	12.092 \| good	19.976 \| good	0.313 \| good	0.998 \| good	0.285 \| good
2026-07-26T23:00:00.000Z	19 \| good	3.068 \| good	13.887 \| good	20.714 \| good	0.379 \| good	1.101 \| good	0.285 \| good
2026-07-27T00:00:00.000Z	19 \| good	3.095 \| good	13.124 \| good	20.365 \| good	0.453 \| good	1.052 \| good	0.285 \| good
2026-07-27T01:00:00.000Z	20 \| good	2.66 \| good	12.445 \| good	21.588 \| good	0.397 \| good	1.05 \| good	0.285 \| good
2026-07-27T02:00:00.000Z	20 \| good	3.177 \| good	15.19 \| good	21.651 \| good	0.436 \| good	1.176 \| good	0.291 \| good
2026-07-27T03:00:00.000Z	44 \| good	8.11 \| good	35.454 \| good	21.438 \| good	0.391 \| good	3.431 \| good	0.093 \| good
2026-07-27T04:00:00.000Z	22 \| good	4.159 \| good	18.868 \| good	22.139 \| good	0.325 \| good	1.603 \| good	0.291 \| good
2026-07-27T05:00:00.000Z	20 \| good	3.347 \| good	15.296 \| good	21.771 \| good	0.318 \| good	1.92 \| good	0.291 \| good
2026-07-27T06:00:00.000Z	22 \| good	4.218 \| good	18.513 \| good	21.623 \| good	0.336 \| good	2.33 \| good	0.285 \| good
2026-07-27T07:00:00.000Z	22 \| good	4.237 \| good	19.011 \| good	20.727 \| good	0.336 \| good	2.595 \| good	0.281 \| good
2026-07-27T08:00:00.000Z	19 \| good	3.375 \| good	14.045 \| good	20.651 \| good	0.325 \| good	2.292 \| good	0.268 \| good
2026-07-27T09:00:00.000Z	19 \| good	2.791 \| good	11.368 \| good	19.912 \| good	0.3 \| good	2.695 \| good	0.285 \| good
2026-07-27T10:00:00.000Z	19 \| good	2.372 \| good	9.696 \| good	19.743 \| good	0.321 \| good	2.083 \| good	0.285 \| good
2026-07-27T11:00:00.000Z	19 \| good	2.781 \| good	11.388 \| good	20.395 \| good	0.298 \| good	1.293 \| good	0.219 \| good
2026-07-27T12:00:00.000Z	19 \| good	2.989 \| good	12.267 \| good	20.395 \| good	0.298 \| good	1.46 \| good	0.219 \| good
2026-07-27T13:00:00.000Z	19 \| good	2.542 \| good	10.673 \| good	20.093 \| good	0.263 \| good	1.774 \| good	0.219 \| good
2026-07-27T14:00:00.000Z	19 \| good	3.086 \| good	11.569 \| good	19.855 \| good	0.355 \| good	2.523 \| good	0.289 \| good
2026-07-27T15:00:00.000Z	22 \| good	3.53 \| good	14.698 \| good	19.988 \| good	0.355 \| good	2.857 \| good	0.303 \| good
2026-07-27T16:00:00.000Z	19 \| good	3.425 \| good	14.769 \| good	20.138 \| good	0.373 \| good	2.419 \| good	0.284 \| good
2026-07-27T17:00:00.000Z	22 \| good	3.802 \| good	14.492 \| good	20.21 \| good	0.408 \| good	2.132 \| good	0.277 \| good
2026-07-27T18:00:00.000Z	22 \| good	3.645 \| good	16.268 \| good	20.926 \| good	0.389 \| good	2.153 \| good	0.287 \| good
2026-07-27T19:00:00.000Z	22 \| good	4.346 \| good	18.79 \| good	21.294 \| good	0.369 \| good	1.96 \| good	0.287 \| good
2026-07-27T20:00:00.000Z	27 \| good	5.133 \| good	22.413 \| good	21.602 \| good	0.371 \| good	1.787 \| good	0.281 \| good
2026-07-27T21:00:00.000Z	33 \| good	5.858 \| good	25.817 \| good	22.605 \| good	0.378 \| good	1.519 \| good	0.281 \| good
2026-07-27T22:00:00.000Z	33 \| good	5.775 \| good	25.219 \| good	22.646 \| good	0.427 \| good	1.465 \| good	0.285 \| good
2026-07-27T23:00:00.000Z	27 \| good	4.994 \| good	22.455 \| good	23.646 \| good	0.36 \| good	1.75 \| good	0.291 \| good
2026-07-28T00:00:00.000Z	22 \| good	4.243 \| good	19.313 \| good	23.91 \| good	0.419 \| good	1.699 \| good	0.282 \| good
2026-07-28T01:00:00.000Z	27 \| good	5.432 \| good	23.104 \| good	23.629 \| good	0.438 \| good	1.963 \| good	0.276 \| good
2026-07-28T02:00:00.000Z	27 \| good	5.376 \| good	24.265 \| good	24.523 \| good	0.4 \| good	1.723 \| good	0.282 \| good
2026-07-28T03:00:00.000Z	33 \| good	5.664 \| good	25.563 \| good	23.806 \| good	0.363 \| good	1.918 \| good	0.282 \| good
2026-07-28T04:00:00.000Z	27 \| good	5.181 \| good	23.649 \| good	22.953 \| good	0.353 \| good	2.575 \| good	0.291 \| good
2026-07-28T05:00:00.000Z	33 \| good	5.712 \| good	25.228 \| good	22.667 \| good	0.33 \| good	3.21 \| good	0.291 \| good
2026-07-28T06:00:00.000Z	33 \| good	5.913 \| good	25.397 \| good	21.752 \| good	0.315 \| good	3.291 \| good	0.294 \| good
2026-07-28T07:00:00.000Z	33 \| good	5.621 \| good	24.409 \| good	21.403 \| good	0.348 \| good	2.624 \| good	0.306 \| good
2026-07-28T08:00:00.000Z	27 \| good	5.326 \| good	23.086 \| good	19.967 \| good	0.326 \| good	2.838 \| good	0.292 \| good
2026-07-28T09:00:00.000Z	27 \| good	4.761 \| good	20.79 \| good	20.243 \| good	0.331 \| good	2.224 \| good	0.289 \| good
2026-07-28T10:00:00.000Z	27 \| good	4.55 \| good	19.146 \| good	19.661 \| good	0.361 \| good	2.123 \| good	0.279 \| good
2026-07-28T11:00:00.000Z	22 \| good	3.882 \| good	16.977 \| good	14.669 \| good	0.363 \| good	6.491 \| good	0.085 \| good
2026-07-28T12:00:00.000Z	22 \| good	3.837 \| good	16.96 \| good	12.754 \| good	0.342 \| good	6.254 \| good	0.084 \| good
2026-07-28T13:00:00.000Z	27 \| good	5.137 \| good	22.181 \| good	11.347 \| good	0.325 \| good	6.115 \| good	0.084 \| good
2026-07-28T14:00:00.000Z	33 \| good	5.65 \| good	24.294 \| good	13.015 \| good	0.312 \| good	5.283 \| good	0.085 \| good
2026-07-28T15:00:00.000Z	38 \| good	6.656 \| good	29.486 \| good	15.276 \| good	0.337 \| good	2.993 \| good	0.075 \| good
2026-07-28T16:00:00.000Z	38 \| good	6.687 \| good	29.793 \| good	16.858 \| good	0.352 \| good	2.15 \| good	0.073 \| good
2026-07-28T17:00:00.000Z	38 \| good	6.804 \| good	30.225 \| good	18.289 \| good	0.38 \| good	1.934 \| good	0.074 \| good
2026-07-28T18:00:00.000Z	44 \| good	8.192 \| good	35.982 \| good	20.59 \| good	0.409 \| good	1.706 \| good	0.075 \| good
2026-07-28T19:00:00.000Z	44 \| good	7.517 \| good	33.024 \| good	23.626 \| good	0.43 \| good	1.42 \| good	0.075 \| good
2026-07-28T20:00:00.000Z	44 \| good	8.404 \| good	36.912 \| good	26.044 \| good	0.443 \| good	1.227 \| good	0.075 \| good
2026-07-28T21:00:00.000Z	44 \| good	7.781 \| good	34.358 \| good	28.931 \| good	0.444 \| good	1.15 \| good	0.075 \| good
2026-07-28T22:00:00.000Z	33 \| good	6.486 \| good	28.647 \| good	28.491 \| good	0.44 \| good	1.164 \| good	0.075 \| good
2026-07-28T23:00:00.000Z	38 \| good	6.846 \| good	30.333 \| good	26.242 \| good	0.432 \| good	1.252 \| good	0.074 \| good
2026-07-29T00:00:00.000Z	38 \| good	7.239 \| good	31.853 \| good	23.839 \| good	0.42 \| good	1.429 \| good	0.074 \| good
2026-07-29T01:00:00.000Z	38 \| good	7.125 \| good	31.454 \| good	22.319 \| good	0.402 \| good	1.867 \| good	0.074 \| good
2026-07-29T02:00:00.000Z	38 \| good	6.609 \| good	29.516 \| good	19.415 \| good	0.388 \| good	2.595 \| good	0.076 \| good
2026-07-29T03:00:00.000Z	33 \| good	6.312 \| good	28.044 \| good	17.153 \| good	0.375 \| good	3.766 \| good	0.078 \| good
2026-07-29T04:00:00.000Z	33 \| good	5.643 \| good	24.422 \| good	16.464 \| good	0.376 \| good	4.701 \| good	0.08 \| good
2026-07-29T05:00:00.000Z	27 \| good	4.701 \| good	20.634 \| good	16.183 \| good	0.379 \| good	5.025 \| good	0.081 \| good
2026-07-29T06:00:00.000Z	22 \| good	3.77 \| good	16.389 \| good	16.442 \| good	0.382 \| good	5.246 \| good	0.082 \| good
2026-07-29T07:00:00.000Z	16 \| good	3.281 \| good	14.257 \| good	15.958 \| good	0.373 \| good	5.86 \| good	0.086 \| good
2026-07-29T08:00:00.000Z	22 \| good	3.947 \| good	17.491 \| good	15.572 \| good	0.363 \| good	5.965 \| good	0.087 \| good
2026-07-29T09:00:00.000Z	22 \| good	4.193 \| good	18.549 \| good	14.826 \| good	0.355 \| good	6.021 \| good	0.087 \| good
2026-07-29T10:00:00.000Z	22 \| good	4.004 \| good	17.61 \| good	13.422 \| good	0.348 \| good	6.16 \| good	0.088 \| good
2026-07-29T11:00:00.000Z	22 \| good	4.12 \| good	18.266 \| good	12.326 \| good	0.342 \| good	6.277 \| good	0.089 \| good
2026-07-29T12:00:00.000Z	27 \| good	4.931 \| good	21.442 \| good	8.714 \| good	0.338 \| good	6.275 \| good	0.089 \| good
2026-07-29T13:00:00.000Z	27 \| good	5.133 \| good	22.14 \| good	9.952 \| good	0.335 \| good	6.148 \| good	0.089 \| good
2026-07-29T14:00:00.000Z	27 \| good	5.041 \| good	21.608 \| good	13.198 \| good	0.331 \| good	3.94 \| good	0.084 \| good
2026-07-29T15:00:00.000Z	33 \| good	5.976 \| good	26.488 \| good	14.328 \| good	0.336 \| good	2.867 \| good	0.083 \| good
2026-07-29T16:00:00.000Z	33 \| good	6.094 \| good	26.493 \| good	14.846 \| good	0.351 \| good	2.423 \| good	0.085 \| good
2026-07-29T17:00:00.000Z	38 \| good	6.791 \| good	30.166 \| good	16.147 \| good	0.38 \| good	2.175 \| good	0.087 \| good
2026-07-29T18:00:00.000Z	38 \| good	7.11 \| good	31.537 \| good	18.384 \| good	0.423 \| good	2.006 \| good	0.089 \| good
2026-07-29T19:00:00.000Z	38 \| good	6.609 \| good	29.058 \| good	20.679 \| good	0.465 \| good	1.868 \| good	0.09 \| good
2026-07-29T20:00:00.000Z	38 \| good	6.884 \| good	30.377 \| good	23.415 \| good	0.495 \| good	1.71 \| good	0.092 \| good
2026-07-29T21:00:00.000Z	44 \| good	7.907 \| good	34.87 \| good	26.915 \| good	0.508 \| good	1.555 \| good	0.093 \| good
2026-07-29T22:00:00.000Z	38 \| good	7.459 \| good	32.965 \| good	26.731 \| good	0.505 \| good	1.433 \| good	0.093 \| good
2026-07-29T23:00:00.000Z	44 \| good	7.699 \| good	33.591 \| good	25.36 \| good	0.487 \| good	1.404 \| good	0.092 \| good
2026-07-30T00:00:00.000Z	44 \| good	8.43 \| good	37.114 \| good	24.25 \| good	0.456 \| good	1.498 \| good	0.091 \| good
2026-07-30T01:00:00.000Z	44 \| good	8.109 \| good	35.71 \| good	21.856 \| good	0.429 \| good	1.847 \| good	0.092 \| good
2026-07-30T02:00:00.000Z	38 \| good	6.873 \| good	30.276 \| good	19.135 \| good	0.414 \| good	2.668 \| good	0.093 \| good
2026-07-30T03:00:00.000Z	33 \| good	6.387 \| good	28.155 \| good	16.882 \| good	0.407 \| good	4.108 \| good	0.095 \| good
2026-07-30T04:00:00.000Z	33 \| good	6.156 \| good	27.137 \| good	15.566 \| good	0.414 \| good	5.625 \| good	0.098 \| good
2026-07-30T05:00:00.000Z	33 \| good	6.212 \| good	27.655 \| good	15.458 \| good	0.429 \| good	6.615 \| good	0.1 \| good
2026-07-30T06:00:00.000Z	52 \| moderate	9.973 \| good	13.996 \| good	14.731 \| good	0.437 \| good	7.704 \| good	0.103 \| good
2026-07-30T07:00:00.000Z	27 \| good	5.165 \| good	22.24 \| good	16.308 \| good	0.434 \| good	8.169 \| good	0.104 \| good
2026-07-30T08:00:00.000Z	27 \| good	5.386 \| good	23.024 \| good	17.557 \| good	0.42 \| good	8.163 \| good	0.104 \| good
2026-07-30T09:00:00.000Z	27 \| good	4.869 \| good	20.991 \| good	17.595 \| good	0.404 \| good	8.276 \| good	0.105 \| good
2026-07-30T10:00:00.000Z	33 \| good	5.595 \| good	24.046 \| good	18.317 \| good	0.392 \| good	8.16 \| good	0.104 \| good

Castro Valley

Get reliable air quality data to drive your business

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

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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

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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 07:00:00 on 2026-07-28.

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 04:00:00 on 2026-07-27.

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

As of now, the AQI in Castro Valley, California is 27, indicating Good 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 4.55 μg/m³.

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

The PM₁₀ concentration in Castro Valley, California is 19.146 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 0.279 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 0.361 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 19.661 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 2.123 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-07-26T11:00:00.000Z	33 \| good	5.741 \| good	23.162 \| good	18.155 \| good	0.495 \| good	3.062 \| good	0.13 \| good
2026-07-26T12:00:00.000Z	22 \| good	4.285 \| good	18.569 \| good	23.032 \| good	0.236 \| good	0.718 \| good	0.21 \| good
2026-07-26T13:00:00.000Z	22 \| good	4.228 \| good	18.229 \| good	18.637 \| good	0.322 \| good	1.169 \| good	0.218 \| good
2026-07-26T14:00:00.000Z	22 \| good	3.679 \| good	15.404 \| good	17.832 \| good	0.313 \| good	1.681 \| good	0.208 \| good
2026-07-26T15:00:00.000Z	22 \| good	4.148 \| good	18.162 \| good	17.933 \| good	0.364 \| good	1.507 \| good	0.211 \| good
2026-07-26T16:00:00.000Z	22 \| good	3.91 \| good	17.091 \| good	18.125 \| good	0.35 \| good	1.339 \| good	0.277 \| good
2026-07-26T17:00:00.000Z	17 \| good	3.409 \| good	14.615 \| good	17.929 \| good	0.406 \| good	1.268 \| good	0.277 \| good
2026-07-26T18:00:00.000Z	22 \| good	3.512 \| good	15.16 \| good	18.52 \| good	0.384 \| good	1.245 \| good	0.281 \| good
2026-07-26T19:00:00.000Z	22 \| good	3.673 \| good	15.798 \| good	18.787 \| good	0.395 \| good	1.14 \| good	0.285 \| good
2026-07-26T20:00:00.000Z	18 \| good	2.917 \| good	13.579 \| good	18.976 \| good	0.391 \| good	1.107 \| good	0.281 \| good
2026-07-26T21:00:00.000Z	19 \| good	2.028 \| good	7.62 \| good	19.956 \| good	0.379 \| good	1.049 \| good	0.285 \| good
2026-07-26T22:00:00.000Z	19 \| good	1.902 \| good	12.092 \| good	19.976 \| good	0.313 \| good	0.998 \| good	0.285 \| good
2026-07-26T23:00:00.000Z	19 \| good	3.068 \| good	13.887 \| good	20.714 \| good	0.379 \| good	1.101 \| good	0.285 \| good
2026-07-27T00:00:00.000Z	19 \| good	3.095 \| good	13.124 \| good	20.365 \| good	0.453 \| good	1.052 \| good	0.285 \| good
2026-07-27T01:00:00.000Z	20 \| good	2.66 \| good	12.445 \| good	21.588 \| good	0.397 \| good	1.05 \| good	0.285 \| good
2026-07-27T02:00:00.000Z	20 \| good	3.177 \| good	15.19 \| good	21.651 \| good	0.436 \| good	1.176 \| good	0.291 \| good
2026-07-27T03:00:00.000Z	44 \| good	8.11 \| good	35.454 \| good	21.438 \| good	0.391 \| good	3.431 \| good	0.093 \| good
2026-07-27T04:00:00.000Z	22 \| good	4.159 \| good	18.868 \| good	22.139 \| good	0.325 \| good	1.603 \| good	0.291 \| good
2026-07-27T05:00:00.000Z	20 \| good	3.347 \| good	15.296 \| good	21.771 \| good	0.318 \| good	1.92 \| good	0.291 \| good
2026-07-27T06:00:00.000Z	22 \| good	4.218 \| good	18.513 \| good	21.623 \| good	0.336 \| good	2.33 \| good	0.285 \| good
2026-07-27T07:00:00.000Z	22 \| good	4.237 \| good	19.011 \| good	20.727 \| good	0.336 \| good	2.595 \| good	0.281 \| good
2026-07-27T08:00:00.000Z	19 \| good	3.375 \| good	14.045 \| good	20.651 \| good	0.325 \| good	2.292 \| good	0.268 \| good
2026-07-27T09:00:00.000Z	19 \| good	2.791 \| good	11.368 \| good	19.912 \| good	0.3 \| good	2.695 \| good	0.285 \| good
2026-07-27T10:00:00.000Z	19 \| good	2.372 \| good	9.696 \| good	19.743 \| good	0.321 \| good	2.083 \| good	0.285 \| good
2026-07-27T11:00:00.000Z	19 \| good	2.781 \| good	11.388 \| good	20.395 \| good	0.298 \| good	1.293 \| good	0.219 \| good
2026-07-27T12:00:00.000Z	19 \| good	2.989 \| good	12.267 \| good	20.395 \| good	0.298 \| good	1.46 \| good	0.219 \| good
2026-07-27T13:00:00.000Z	19 \| good	2.542 \| good	10.673 \| good	20.093 \| good	0.263 \| good	1.774 \| good	0.219 \| good
2026-07-27T14:00:00.000Z	19 \| good	3.086 \| good	11.569 \| good	19.855 \| good	0.355 \| good	2.523 \| good	0.289 \| good
2026-07-27T15:00:00.000Z	22 \| good	3.53 \| good	14.698 \| good	19.988 \| good	0.355 \| good	2.857 \| good	0.303 \| good
2026-07-27T16:00:00.000Z	19 \| good	3.425 \| good	14.769 \| good	20.138 \| good	0.373 \| good	2.419 \| good	0.284 \| good
2026-07-27T17:00:00.000Z	22 \| good	3.802 \| good	14.492 \| good	20.21 \| good	0.408 \| good	2.132 \| good	0.277 \| good
2026-07-27T18:00:00.000Z	22 \| good	3.645 \| good	16.268 \| good	20.926 \| good	0.389 \| good	2.153 \| good	0.287 \| good
2026-07-27T19:00:00.000Z	22 \| good	4.346 \| good	18.79 \| good	21.294 \| good	0.369 \| good	1.96 \| good	0.287 \| good
2026-07-27T20:00:00.000Z	27 \| good	5.133 \| good	22.413 \| good	21.602 \| good	0.371 \| good	1.787 \| good	0.281 \| good
2026-07-27T21:00:00.000Z	33 \| good	5.858 \| good	25.817 \| good	22.605 \| good	0.378 \| good	1.519 \| good	0.281 \| good
2026-07-27T22:00:00.000Z	33 \| good	5.775 \| good	25.219 \| good	22.646 \| good	0.427 \| good	1.465 \| good	0.285 \| good
2026-07-27T23:00:00.000Z	27 \| good	4.994 \| good	22.455 \| good	23.646 \| good	0.36 \| good	1.75 \| good	0.291 \| good
2026-07-28T00:00:00.000Z	22 \| good	4.243 \| good	19.313 \| good	23.91 \| good	0.419 \| good	1.699 \| good	0.282 \| good
2026-07-28T01:00:00.000Z	27 \| good	5.432 \| good	23.104 \| good	23.629 \| good	0.438 \| good	1.963 \| good	0.276 \| good
2026-07-28T02:00:00.000Z	27 \| good	5.376 \| good	24.265 \| good	24.523 \| good	0.4 \| good	1.723 \| good	0.282 \| good
2026-07-28T03:00:00.000Z	33 \| good	5.664 \| good	25.563 \| good	23.806 \| good	0.363 \| good	1.918 \| good	0.282 \| good
2026-07-28T04:00:00.000Z	27 \| good	5.181 \| good	23.649 \| good	22.953 \| good	0.353 \| good	2.575 \| good	0.291 \| good
2026-07-28T05:00:00.000Z	33 \| good	5.712 \| good	25.228 \| good	22.667 \| good	0.33 \| good	3.21 \| good	0.291 \| good
2026-07-28T06:00:00.000Z	33 \| good	5.913 \| good	25.397 \| good	21.752 \| good	0.315 \| good	3.291 \| good	0.294 \| good
2026-07-28T07:00:00.000Z	33 \| good	5.621 \| good	24.409 \| good	21.403 \| good	0.348 \| good	2.624 \| good	0.306 \| good
2026-07-28T08:00:00.000Z	27 \| good	5.326 \| good	23.086 \| good	19.967 \| good	0.326 \| good	2.838 \| good	0.292 \| good
2026-07-28T09:00:00.000Z	27 \| good	4.761 \| good	20.79 \| good	20.243 \| good	0.331 \| good	2.224 \| good	0.289 \| good
2026-07-28T10:00:00.000Z	27 \| good	4.55 \| good	19.146 \| good	19.661 \| good	0.361 \| good	2.123 \| good	0.279 \| good
2026-07-28T11:00:00.000Z	22 \| good	3.882 \| good	16.977 \| good	14.669 \| good	0.363 \| good	6.491 \| good	0.085 \| good
2026-07-28T12:00:00.000Z	22 \| good	3.837 \| good	16.96 \| good	12.754 \| good	0.342 \| good	6.254 \| good	0.084 \| good
2026-07-28T13:00:00.000Z	27 \| good	5.137 \| good	22.181 \| good	11.347 \| good	0.325 \| good	6.115 \| good	0.084 \| good
2026-07-28T14:00:00.000Z	33 \| good	5.65 \| good	24.294 \| good	13.015 \| good	0.312 \| good	5.283 \| good	0.085 \| good
2026-07-28T15:00:00.000Z	38 \| good	6.656 \| good	29.486 \| good	15.276 \| good	0.337 \| good	2.993 \| good	0.075 \| good
2026-07-28T16:00:00.000Z	38 \| good	6.687 \| good	29.793 \| good	16.858 \| good	0.352 \| good	2.15 \| good	0.073 \| good
2026-07-28T17:00:00.000Z	38 \| good	6.804 \| good	30.225 \| good	18.289 \| good	0.38 \| good	1.934 \| good	0.074 \| good
2026-07-28T18:00:00.000Z	44 \| good	8.192 \| good	35.982 \| good	20.59 \| good	0.409 \| good	1.706 \| good	0.075 \| good
2026-07-28T19:00:00.000Z	44 \| good	7.517 \| good	33.024 \| good	23.626 \| good	0.43 \| good	1.42 \| good	0.075 \| good
2026-07-28T20:00:00.000Z	44 \| good	8.404 \| good	36.912 \| good	26.044 \| good	0.443 \| good	1.227 \| good	0.075 \| good
2026-07-28T21:00:00.000Z	44 \| good	7.781 \| good	34.358 \| good	28.931 \| good	0.444 \| good	1.15 \| good	0.075 \| good
2026-07-28T22:00:00.000Z	33 \| good	6.486 \| good	28.647 \| good	28.491 \| good	0.44 \| good	1.164 \| good	0.075 \| good
2026-07-28T23:00:00.000Z	38 \| good	6.846 \| good	30.333 \| good	26.242 \| good	0.432 \| good	1.252 \| good	0.074 \| good
2026-07-29T00:00:00.000Z	38 \| good	7.239 \| good	31.853 \| good	23.839 \| good	0.42 \| good	1.429 \| good	0.074 \| good
2026-07-29T01:00:00.000Z	38 \| good	7.125 \| good	31.454 \| good	22.319 \| good	0.402 \| good	1.867 \| good	0.074 \| good
2026-07-29T02:00:00.000Z	38 \| good	6.609 \| good	29.516 \| good	19.415 \| good	0.388 \| good	2.595 \| good	0.076 \| good
2026-07-29T03:00:00.000Z	33 \| good	6.312 \| good	28.044 \| good	17.153 \| good	0.375 \| good	3.766 \| good	0.078 \| good
2026-07-29T04:00:00.000Z	33 \| good	5.643 \| good	24.422 \| good	16.464 \| good	0.376 \| good	4.701 \| good	0.08 \| good
2026-07-29T05:00:00.000Z	27 \| good	4.701 \| good	20.634 \| good	16.183 \| good	0.379 \| good	5.025 \| good	0.081 \| good
2026-07-29T06:00:00.000Z	22 \| good	3.77 \| good	16.389 \| good	16.442 \| good	0.382 \| good	5.246 \| good	0.082 \| good
2026-07-29T07:00:00.000Z	16 \| good	3.281 \| good	14.257 \| good	15.958 \| good	0.373 \| good	5.86 \| good	0.086 \| good
2026-07-29T08:00:00.000Z	22 \| good	3.947 \| good	17.491 \| good	15.572 \| good	0.363 \| good	5.965 \| good	0.087 \| good
2026-07-29T09:00:00.000Z	22 \| good	4.193 \| good	18.549 \| good	14.826 \| good	0.355 \| good	6.021 \| good	0.087 \| good
2026-07-29T10:00:00.000Z	22 \| good	4.004 \| good	17.61 \| good	13.422 \| good	0.348 \| good	6.16 \| good	0.088 \| good
2026-07-29T11:00:00.000Z	22 \| good	4.12 \| good	18.266 \| good	12.326 \| good	0.342 \| good	6.277 \| good	0.089 \| good
2026-07-29T12:00:00.000Z	27 \| good	4.931 \| good	21.442 \| good	8.714 \| good	0.338 \| good	6.275 \| good	0.089 \| good
2026-07-29T13:00:00.000Z	27 \| good	5.133 \| good	22.14 \| good	9.952 \| good	0.335 \| good	6.148 \| good	0.089 \| good
2026-07-29T14:00:00.000Z	27 \| good	5.041 \| good	21.608 \| good	13.198 \| good	0.331 \| good	3.94 \| good	0.084 \| good
2026-07-29T15:00:00.000Z	33 \| good	5.976 \| good	26.488 \| good	14.328 \| good	0.336 \| good	2.867 \| good	0.083 \| good
2026-07-29T16:00:00.000Z	33 \| good	6.094 \| good	26.493 \| good	14.846 \| good	0.351 \| good	2.423 \| good	0.085 \| good
2026-07-29T17:00:00.000Z	38 \| good	6.791 \| good	30.166 \| good	16.147 \| good	0.38 \| good	2.175 \| good	0.087 \| good
2026-07-29T18:00:00.000Z	38 \| good	7.11 \| good	31.537 \| good	18.384 \| good	0.423 \| good	2.006 \| good	0.089 \| good
2026-07-29T19:00:00.000Z	38 \| good	6.609 \| good	29.058 \| good	20.679 \| good	0.465 \| good	1.868 \| good	0.09 \| good
2026-07-29T20:00:00.000Z	38 \| good	6.884 \| good	30.377 \| good	23.415 \| good	0.495 \| good	1.71 \| good	0.092 \| good
2026-07-29T21:00:00.000Z	44 \| good	7.907 \| good	34.87 \| good	26.915 \| good	0.508 \| good	1.555 \| good	0.093 \| good
2026-07-29T22:00:00.000Z	38 \| good	7.459 \| good	32.965 \| good	26.731 \| good	0.505 \| good	1.433 \| good	0.093 \| good
2026-07-29T23:00:00.000Z	44 \| good	7.699 \| good	33.591 \| good	25.36 \| good	0.487 \| good	1.404 \| good	0.092 \| good
2026-07-30T00:00:00.000Z	44 \| good	8.43 \| good	37.114 \| good	24.25 \| good	0.456 \| good	1.498 \| good	0.091 \| good
2026-07-30T01:00:00.000Z	44 \| good	8.109 \| good	35.71 \| good	21.856 \| good	0.429 \| good	1.847 \| good	0.092 \| good
2026-07-30T02:00:00.000Z	38 \| good	6.873 \| good	30.276 \| good	19.135 \| good	0.414 \| good	2.668 \| good	0.093 \| good
2026-07-30T03:00:00.000Z	33 \| good	6.387 \| good	28.155 \| good	16.882 \| good	0.407 \| good	4.108 \| good	0.095 \| good
2026-07-30T04:00:00.000Z	33 \| good	6.156 \| good	27.137 \| good	15.566 \| good	0.414 \| good	5.625 \| good	0.098 \| good
2026-07-30T05:00:00.000Z	33 \| good	6.212 \| good	27.655 \| good	15.458 \| good	0.429 \| good	6.615 \| good	0.1 \| good
2026-07-30T06:00:00.000Z	52 \| moderate	9.973 \| good	13.996 \| good	14.731 \| good	0.437 \| good	7.704 \| good	0.103 \| good
2026-07-30T07:00:00.000Z	27 \| good	5.165 \| good	22.24 \| good	16.308 \| good	0.434 \| good	8.169 \| good	0.104 \| good
2026-07-30T08:00:00.000Z	27 \| good	5.386 \| good	23.024 \| good	17.557 \| good	0.42 \| good	8.163 \| good	0.104 \| good
2026-07-30T09:00:00.000Z	27 \| good	4.869 \| good	20.991 \| good	17.595 \| good	0.404 \| good	8.276 \| good	0.105 \| good
2026-07-30T10:00:00.000Z	33 \| good	5.595 \| good	24.046 \| good	18.317 \| good	0.392 \| good	8.16 \| good	0.104 \| 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

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

Air quality in nearby cities

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Hayward, California

Cherryland, California

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Frequently asked questions

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

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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?

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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?