What is the current level of PM10 in Hillsborough, California?

Hillsborough, California currently has a PM10 concentration of 55.611 μg/m3.

What is the current level of sulfur dioxide (SO2) in Hillsborough, California?

The current sulfur dioxide (SO2) concentration in Hillsborough, California is 0.341 ppb.

What is the current level of ozone (O3) in Hillsborough, California?

Hillsborough, California currently has an ozone (O3) concentration of 4.819 ppm.

What is the current level of nitrogen dioxide (NO2) in Hillsborough, California?

The current level of nitrogen dioxide (NO2) in Hillsborough, California is 12.506 ppb.

Current air quality index in Hillsborough, California today

Q: What is the PM2.5 concentration in Hillsborough, California right now?

Hillsborough, California currently has a PM2.5 concentration of 12.207 μg/m3.

Stay updated with real-time air quality in Hillsborough, 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

Hillsborough, California

Last updated: ... (Local time)

Common air pollutants in Hillsborough, California

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

14.67 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

28.88 μg/m³

155

255

425

605+

Ozone (O₃)

5.12 ppb

201

201+

Sulfur Dioxide (SO₂)

0.36 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

11.78 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.37 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Hillsborough, California

Get Live Pollen Counts

Hillsborough, California

Scroll To Air Quality Map

Track live Hillsborough, California air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-12-05T19:00:00.000Z	67 \| moderate	18.365 \| fine	53.682 \| good	10.951 \| good	0.485 \| good	12.361 \| good	0.432 \| good
2025-12-05T20:00:00.000Z	67 \| moderate	17.796 \| fine	45.178 \| good	11.764 \| good	0.436 \| good	11.414 \| good	0.347 \| good
2025-12-05T21:00:00.000Z	67 \| moderate	18.029 \| fine	31.345 \| good	12.475 \| good	0.414 \| good	10.016 \| good	0.332 \| good
2025-12-05T22:00:00.000Z	69 \| moderate	18.917 \| fine	69.119 \| fine	13.31 \| good	0.525 \| good	9.971 \| good	0.279 \| good
2025-12-05T23:00:00.000Z	75 \| moderate	22.488 \| fine	79.732 \| fine	14.486 \| good	0.482 \| good	9.129 \| good	0.287 \| good
2025-12-06T00:00:00.000Z	62 \| moderate	15.087 \| fine	57.373 \| fine	14.071 \| good	0.487 \| good	11.197 \| good	0.267 \| good
2025-12-06T01:00:00.000Z	60 \| moderate	14.197 \| fine	59.524 \| fine	15.491 \| good	0.452 \| good	11.176 \| good	0.275 \| good
2025-12-06T02:00:00.000Z	71 \| moderate	20.283 \| fine	85.025 \| fine	14.752 \| good	0.367 \| good	13.59 \| good	0.328 \| good
2025-12-06T03:00:00.000Z	64 \| moderate	15.799 \| fine	54.165 \| good	14.504 \| good	0.332 \| good	16.495 \| good	0.432 \| good
2025-12-06T04:00:00.000Z	58 \| moderate	12.546 \| fine	49.805 \| good	13.761 \| good	0.349 \| good	15.697 \| good	0.471 \| good
2025-12-06T05:00:00.000Z	76 \| moderate	16.138 \| fine	104.708 \| fine	12.486 \| good	0.436 \| good	14.386 \| good	0.464 \| good
2025-12-06T06:00:00.000Z	58 \| moderate	13.397 \| fine	51.502 \| good	13.242 \| good	0.402 \| good	11.211 \| good	0.538 \| good
2025-12-06T07:00:00.000Z	56 \| moderate	11.813 \| good	40.622 \| good	12.333 \| good	0.42 \| good	13.276 \| good	0.538 \| good
2025-12-06T08:00:00.000Z	56 \| moderate	12.003 \| good	64.07 \| fine	11.895 \| good	0.39 \| good	12.118 \| good	0.432 \| good
2025-12-06T09:00:00.000Z	56 \| moderate	11.016 \| good	65.713 \| fine	15.071 \| good	0.41 \| good	11.477 \| good	0.356 \| good
2025-12-06T10:00:00.000Z	71 \| moderate	20.483 \| fine	87.237 \| fine	12.104 \| good	0.94 \| good	12.17 \| good	0.429 \| good
2025-12-06T11:00:00.000Z	73 \| moderate	20.663 \| fine	78.798 \| fine	8.162 \| good	0.866 \| good	9.584 \| good	0.382 \| good
2025-12-06T12:00:00.000Z	58 \| moderate	12.887 \| fine	69.643 \| fine	5.029 \| good	0.315 \| good	8.226 \| good	0.375 \| good
2025-12-06T13:00:00.000Z	69 \| moderate	19.297 \| fine	74.642 \| fine	7.054 \| good	0.364 \| good	12.001 \| good	0.304 \| good
2025-12-06T14:00:00.000Z	69 \| moderate	18.752 \| fine	62.468 \| fine	5.379 \| good	0.521 \| good	6.905 \| good	0.209 \| good
2025-12-06T15:00:00.000Z	60 \| moderate	13.816 \| fine	54.619 \| good	6.862 \| good	0.409 \| good	8.179 \| good	0.273 \| good
2025-12-06T16:00:00.000Z	60 \| moderate	14.353 \| fine	63.779 \| fine	5.253 \| good	0.377 \| good	6.727 \| good	0.309 \| good
2025-12-06T17:00:00.000Z	58 \| moderate	13 \| fine	54.297 \| good	7.3 \| good	0.426 \| good	7.117 \| good	0.27 \| good
2025-12-06T18:00:00.000Z	64 \| moderate	15.786 \| fine	60.657 \| fine	8.525 \| good	0.495 \| good	7.287 \| good	0.31 \| good
2025-12-06T19:00:00.000Z	66 \| moderate	17.224 \| fine	44.101 \| good	10.862 \| good	0.572 \| good	6.138 \| good	0.372 \| good
2025-12-06T20:00:00.000Z	66 \| moderate	16.95 \| fine	85.861 \| fine	11.254 \| good	0.554 \| good	5.405 \| good	0.352 \| good
2025-12-06T21:00:00.000Z	77 \| moderate	23.04 \| fine	64.457 \| fine	12.729 \| good	0.567 \| good	7.19 \| good	0.373 \| good
2025-12-06T22:00:00.000Z	66 \| moderate	17.067 \| fine	70.51 \| fine	13.326 \| good	0.566 \| good	7.31 \| good	0.352 \| good
2025-12-06T23:00:00.000Z	64 \| moderate	15.579 \| fine	47.663 \| good	12.349 \| good	0.474 \| good	6.781 \| good	0.31 \| good
2025-12-07T00:00:00.000Z	60 \| moderate	13.616 \| fine	53.801 \| good	14.41 \| good	0.514 \| good	8.017 \| good	0.31 \| good
2025-12-07T01:00:00.000Z	54 \| moderate	11.207 \| good	45.614 \| good	15.705 \| good	0.443 \| good	9.514 \| good	0.337 \| good
2025-12-07T02:00:00.000Z	52 \| moderate	9.826 \| good	45.77 \| good	12.597 \| good	0.382 \| good	9.976 \| good	0.374 \| good
2025-12-07T03:00:00.000Z	44 \| good	8.135 \| good	19.43 \| good	11.148 \| good	0.319 \| good	12.315 \| good	0.391 \| good
2025-12-07T04:00:00.000Z	52 \| moderate	9.694 \| good	24.862 \| good	11.572 \| good	0.313 \| good	12.155 \| good	0.49 \| good
2025-12-07T05:00:00.000Z	38 \| good	7.238 \| good	26.007 \| good	12.643 \| good	0.269 \| good	10.217 \| good	0.528 \| good
2025-12-07T06:00:00.000Z	60 \| moderate	13.533 \| fine	24.772 \| good	12.776 \| good	0.262 \| good	9.001 \| good	0.526 \| good
2025-12-07T07:00:00.000Z	60 \| moderate	13.774 \| fine	55.594 \| fine	8.614 \| good	0.266 \| good	9.097 \| good	0.512 \| good
2025-12-07T08:00:00.000Z	66 \| moderate	16.736 \| fine	62.945 \| fine	5.909 \| good	0.272 \| good	9.874 \| good	0.544 \| good
2025-12-07T09:00:00.000Z	71 \| moderate	20.211 \| fine	93.434 \| fine	8.245 \| good	0.327 \| good	7.768 \| good	0.466 \| good
2025-12-07T10:00:00.000Z	74 \| moderate	21.413 \| fine	100.911 \| fine	8.266 \| good	0.476 \| good	4.215 \| good	0.265 \| good
2025-12-07T11:00:00.000Z	58 \| moderate	12.539 \| fine	39.159 \| good	9.555 \| good	0.505 \| good	3.406 \| good	0.256 \| good
2025-12-07T12:00:00.000Z	64 \| moderate	16.259 \| fine	64.194 \| fine	5.14 \| good	0.335 \| good	7.336 \| good	0.215 \| good
2025-12-07T13:00:00.000Z	66 \| moderate	17.233 \| fine	66.707 \| fine	5.584 \| good	0.36 \| good	9.857 \| good	0.309 \| good
2025-12-07T14:00:00.000Z	71 \| moderate	19.86 \| fine	93.454 \| fine	9.064 \| good	0.444 \| good	11.928 \| good	0.471 \| good
2025-12-07T15:00:00.000Z	69 \| moderate	18.769 \| fine	71.145 \| fine	7.398 \| good	0.403 \| good	9.968 \| good	0.352 \| good
2025-12-07T16:00:00.000Z	62 \| moderate	15.499 \| fine	68.482 \| fine	6.115 \| good	0.345 \| good	13.299 \| good	0.332 \| good
2025-12-07T17:00:00.000Z	64 \| moderate	16.371 \| fine	35.535 \| good	5.239 \| good	0.365 \| good	11.073 \| good	0.373 \| good
2025-12-07T18:00:00.000Z	62 \| moderate	14.67 \| fine	28.875 \| good	5.119 \| good	0.36 \| good	11.775 \| good	0.368 \| good
2025-12-07T17:00:00.000Z	60 \| moderate	14.247 \| fine	63.909 \| fine	5.08 \| good	1.663 \| good	13.529 \| good	0.24 \| good
2025-12-07T18:00:00.000Z	52 \| moderate	10.101 \| good	44.903 \| good	8.035 \| good	1.821 \| good	12.446 \| good	0.245 \| good
2025-12-07T19:00:00.000Z	38 \| good	7.327 \| good	32.418 \| good	12.298 \| good	1.947 \| good	11.563 \| good	0.225 \| good
2025-12-07T20:00:00.000Z	33 \| good	6.077 \| good	26.452 \| good	16.322 \| good	2.073 \| good	10.68 \| good	0.205 \| good
2025-12-07T21:00:00.000Z	38 \| good	7.408 \| good	32.847 \| good	17.268 \| good	2.199 \| good	9.797 \| good	0.186 \| good
2025-12-07T22:00:00.000Z	38 \| good	6.588 \| good	28.866 \| good	18.375 \| good	2.041 \| good	10.572 \| good	0.179 \| good
2025-12-07T23:00:00.000Z	22 \| good	4.406 \| good	18.906 \| good	18.779 \| good	1.883 \| good	11.347 \| good	0.172 \| good
2025-12-08T00:00:00.000Z	19 \| good	2.247 \| good	9.325 \| good	20.565 \| good	1.725 \| good	12.123 \| good	0.166 \| good
2025-12-08T01:00:00.000Z	18 \| good	1.954 \| good	8.454 \| good	18.623 \| good	1.625 \| good	12.886 \| good	0.185 \| good
2025-12-08T02:00:00.000Z	17 \| good	1.288 \| good	5.208 \| good	17.547 \| good	1.525 \| good	13.65 \| good	0.205 \| good
2025-12-08T03:00:00.000Z	15 \| good	2.216 \| good	9.109 \| good	16.029 \| good	1.426 \| good	14.414 \| good	0.224 \| good
2025-12-08T04:00:00.000Z	15 \| good	1.791 \| good	7.458 \| good	16.483 \| good	1.52 \| good	14.286 \| good	0.229 \| good
2025-12-08T05:00:00.000Z	15 \| good	1.449 \| good	5.935 \| good	16.046 \| good	1.615 \| good	14.159 \| good	0.234 \| good
2025-12-08T06:00:00.000Z	13 \| good	2.134 \| good	8.775 \| good	13.241 \| good	1.709 \| good	14.031 \| good	0.239 \| good
2025-12-08T07:00:00.000Z	13 \| good	1.986 \| good	8.093 \| good	9.232 \| good	1.649 \| good	14 \| good	0.24 \| good
2025-12-08T08:00:00.000Z	27 \| good	4.524 \| good	19.54 \| good	4.464 \| good	1.589 \| good	13.968 \| good	0.24 \| good
2025-12-08T09:00:00.000Z	44 \| good	7.816 \| good	34.5 \| good	2.844 \| good	1.529 \| good	13.937 \| good	0.241 \| good
2025-12-08T10:00:00.000Z	52 \| moderate	10.097 \| good	44.624 \| good	1.795 \| good	1.484 \| good	13.483 \| good	0.239 \| good
2025-12-08T11:00:00.000Z	58 \| moderate	13.073 \| fine	58.861 \| fine	1.299 \| good	1.44 \| good	13.029 \| good	0.237 \| good
2025-12-08T12:00:00.000Z	64 \| moderate	15.723 \| fine	69.881 \| fine	1.416 \| good	1.395 \| good	12.575 \| good	0.235 \| good
2025-12-08T13:00:00.000Z	67 \| moderate	17.934 \| fine	79.71 \| fine	1.33 \| good	1.54 \| good	12.339 \| good	0.242 \| good
2025-12-08T14:00:00.000Z	71 \| moderate	19.991 \| fine	87.789 \| fine	1.005 \| good	1.685 \| good	12.103 \| good	0.249 \| good
2025-12-08T15:00:00.000Z	69 \| moderate	19.484 \| fine	85.621 \| fine	0.995 \| good	1.83 \| good	11.867 \| good	0.255 \| good
2025-12-08T16:00:00.000Z	71 \| moderate	19.548 \| fine	86.574 \| fine	3.417 \| good	2.4 \| good	12.234 \| good	0.248 \| good
2025-12-08T17:00:00.000Z	62 \| moderate	15.218 \| fine	67.86 \| fine	6.298 \| good	2.971 \| good	12.6 \| good	0.241 \| good
2025-12-08T18:00:00.000Z	56 \| moderate	12.371 \| fine	55.427 \| fine	8.252 \| good	3.542 \| good	12.967 \| good	0.233 \| good
2025-12-08T19:00:00.000Z	52 \| moderate	9.602 \| good	42.744 \| good	11.669 \| good	3.323 \| good	11.603 \| good	0.211 \| good
2025-12-08T20:00:00.000Z	49 \| good	8.825 \| good	38.633 \| good	14.451 \| good	3.104 \| good	10.24 \| good	0.188 \| good
2025-12-08T21:00:00.000Z	52 \| moderate	9.986 \| good	43.956 \| good	15.283 \| good	2.885 \| good	8.876 \| good	0.165 \| good
2025-12-08T22:00:00.000Z	54 \| moderate	11.178 \| good	49.435 \| good	16.148 \| good	2.56 \| good	9.096 \| good	0.161 \| good
2025-12-08T23:00:00.000Z	54 \| moderate	11.305 \| good	50.574 \| good	16.575 \| good	2.234 \| good	9.315 \| good	0.156 \| good
2025-12-09T00:00:00.000Z	38 \| good	6.578 \| good	28.872 \| good	18.701 \| good	1.909 \| good	9.534 \| good	0.152 \| good
2025-12-09T01:00:00.000Z	27 \| good	5.297 \| good	23.061 \| good	15.925 \| good	1.718 \| good	10.929 \| good	0.175 \| good
2025-12-09T02:00:00.000Z	22 \| good	3.949 \| good	17.091 \| good	15.31 \| good	1.526 \| good	12.324 \| good	0.197 \| good
2025-12-09T03:00:00.000Z	27 \| good	4.751 \| good	20.602 \| good	15.636 \| good	1.335 \| good	13.719 \| good	0.22 \| good
2025-12-09T04:00:00.000Z	22 \| good	3.712 \| good	16.33 \| good	16.509 \| good	1.38 \| good	12.71 \| good	0.224 \| good
2025-12-09T05:00:00.000Z	22 \| good	3.649 \| good	15.633 \| good	18.205 \| good	1.425 \| good	11.702 \| good	0.228 \| good
2025-12-09T06:00:00.000Z	18 \| good	2.279 \| good	9.402 \| good	19.143 \| good	1.47 \| good	10.693 \| good	0.232 \| good
2025-12-09T07:00:00.000Z	17 \| good	2.533 \| good	10.364 \| good	18.392 \| good	1.403 \| good	10.267 \| good	0.232 \| good
2025-12-09T08:00:00.000Z	16 \| good	2.119 \| good	8.797 \| good	16.792 \| good	1.337 \| good	9.842 \| good	0.233 \| good
2025-12-09T09:00:00.000Z	27 \| good	4.679 \| good	20.465 \| good	12.78 \| good	1.27 \| good	9.416 \| good	0.233 \| good
2025-12-09T10:00:00.000Z	33 \| good	5.919 \| good	26.03 \| good	8.681 \| good	1.175 \| good	8.872 \| good	0.226 \| good
2025-12-09T11:00:00.000Z	38 \| good	6.723 \| good	29.685 \| good	5.307 \| good	1.08 \| good	8.328 \| good	0.218 \| good
2025-12-09T12:00:00.000Z	49 \| good	9.279 \| good	41.144 \| good	3.089 \| good	0.985 \| good	7.784 \| good	0.21 \| good
2025-12-09T13:00:00.000Z	56 \| moderate	11.65 \| good	52.041 \| good	2.343 \| good	1.061 \| good	8.072 \| good	0.211 \| good
2025-12-09T14:00:00.000Z	58 \| moderate	13.319 \| fine	59.382 \| fine	2.316 \| good	1.138 \| good	8.36 \| good	0.211 \| good
2025-12-09T15:00:00.000Z	56 \| moderate	11.818 \| good	53.484 \| good	2.999 \| good	1.214 \| good	8.647 \| good	0.212 \| good
2025-12-09T16:00:00.000Z	49 \| good	8.669 \| good	38.418 \| good	5.795 \| good	1.223 \| good	8.168 \| good	0.211 \| good

Hillsborough

Empower business decisions with accurate air quality data

Real-time air quality map: Monitor AQI near Hillsborough, California

0.29ppm

How accurate is California, USA air quality data?

The air quality data for California, USA is gathered from reliable sources such as satellites and monitoring stations, adhering to US EPA guidelines. With the help of advanced algorithms and machine learning, factors like traffic and population density are analyzed to deliver accurate and dependable results.

Source: Ambee Data Sources

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Frequently asked questions

How frequently does the air quality data for Hillsborough, California get updated?

Air quality updates for Hillsborough, California are available every hour.

What time in the past 24 hours saw the poorest air quality in Hillsborough, California?

Hillsborough, California experienced its worst air quality at 01:00:00, 2025-12-07.

When was air quality in Hillsborough, California the best over the past 24 hours?

The best air quality in Hillsborough, California was observed at 06:00:00 on 2025-12-07.

What is the air quality in Hillsborough, California right now?

The air quality in Hillsborough, California right now is Moderate, with an AQI of 56.

What pollutant is most frequently found in Hillsborough, California?

In Hillsborough, California, PM2.5 is the most frequently found pollutant.

What can I do if the air quality in Hillsborough, California is poor?

When air quality in Hillsborough, California is compromised, staying indoors and wearing a mask can reduce health risks.

What is the PM_2.5 concentration in Hillsborough, California right now?

Hillsborough, California currently has a PM_2.5 concentration of 12.207 μg/m³.

What is the current level of PM₁₀ in Hillsborough, California?

Hillsborough, California currently has a PM₁₀ concentration of 55.611 μg/m³.

What is the current level of carbon monoxide (CO) in Hillsborough, California?

The current carbon monoxide (CO) level in Hillsborough, California is 0.329 ppm.

What is the current level of sulfur dioxide (SO₂) in Hillsborough, California?

The current sulfur dioxide (SO₂) concentration in Hillsborough, California is 0.341 ppb.

What is the current level of ozone (O₃) in Hillsborough, California?

Hillsborough, California currently has an ozone (O₃) concentration of 4.819 ppm.

What is the current level of nitrogen dioxide (NO₂) in Hillsborough, California?

The current level of nitrogen dioxide (NO₂) in Hillsborough, California is 12.506 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-12-05T19:00:00.000Z	67 \| moderate	18.365 \| fine	53.682 \| good	10.951 \| good	0.485 \| good	12.361 \| good	0.432 \| good
2025-12-05T20:00:00.000Z	67 \| moderate	17.796 \| fine	45.178 \| good	11.764 \| good	0.436 \| good	11.414 \| good	0.347 \| good
2025-12-05T21:00:00.000Z	67 \| moderate	18.029 \| fine	31.345 \| good	12.475 \| good	0.414 \| good	10.016 \| good	0.332 \| good
2025-12-05T22:00:00.000Z	69 \| moderate	18.917 \| fine	69.119 \| fine	13.31 \| good	0.525 \| good	9.971 \| good	0.279 \| good
2025-12-05T23:00:00.000Z	75 \| moderate	22.488 \| fine	79.732 \| fine	14.486 \| good	0.482 \| good	9.129 \| good	0.287 \| good
2025-12-06T00:00:00.000Z	62 \| moderate	15.087 \| fine	57.373 \| fine	14.071 \| good	0.487 \| good	11.197 \| good	0.267 \| good
2025-12-06T01:00:00.000Z	60 \| moderate	14.197 \| fine	59.524 \| fine	15.491 \| good	0.452 \| good	11.176 \| good	0.275 \| good
2025-12-06T02:00:00.000Z	71 \| moderate	20.283 \| fine	85.025 \| fine	14.752 \| good	0.367 \| good	13.59 \| good	0.328 \| good
2025-12-06T03:00:00.000Z	64 \| moderate	15.799 \| fine	54.165 \| good	14.504 \| good	0.332 \| good	16.495 \| good	0.432 \| good
2025-12-06T04:00:00.000Z	58 \| moderate	12.546 \| fine	49.805 \| good	13.761 \| good	0.349 \| good	15.697 \| good	0.471 \| good
2025-12-06T05:00:00.000Z	76 \| moderate	16.138 \| fine	104.708 \| fine	12.486 \| good	0.436 \| good	14.386 \| good	0.464 \| good
2025-12-06T06:00:00.000Z	58 \| moderate	13.397 \| fine	51.502 \| good	13.242 \| good	0.402 \| good	11.211 \| good	0.538 \| good
2025-12-06T07:00:00.000Z	56 \| moderate	11.813 \| good	40.622 \| good	12.333 \| good	0.42 \| good	13.276 \| good	0.538 \| good
2025-12-06T08:00:00.000Z	56 \| moderate	12.003 \| good	64.07 \| fine	11.895 \| good	0.39 \| good	12.118 \| good	0.432 \| good
2025-12-06T09:00:00.000Z	56 \| moderate	11.016 \| good	65.713 \| fine	15.071 \| good	0.41 \| good	11.477 \| good	0.356 \| good
2025-12-06T10:00:00.000Z	71 \| moderate	20.483 \| fine	87.237 \| fine	12.104 \| good	0.94 \| good	12.17 \| good	0.429 \| good
2025-12-06T11:00:00.000Z	73 \| moderate	20.663 \| fine	78.798 \| fine	8.162 \| good	0.866 \| good	9.584 \| good	0.382 \| good
2025-12-06T12:00:00.000Z	58 \| moderate	12.887 \| fine	69.643 \| fine	5.029 \| good	0.315 \| good	8.226 \| good	0.375 \| good
2025-12-06T13:00:00.000Z	69 \| moderate	19.297 \| fine	74.642 \| fine	7.054 \| good	0.364 \| good	12.001 \| good	0.304 \| good
2025-12-06T14:00:00.000Z	69 \| moderate	18.752 \| fine	62.468 \| fine	5.379 \| good	0.521 \| good	6.905 \| good	0.209 \| good
2025-12-06T15:00:00.000Z	60 \| moderate	13.816 \| fine	54.619 \| good	6.862 \| good	0.409 \| good	8.179 \| good	0.273 \| good
2025-12-06T16:00:00.000Z	60 \| moderate	14.353 \| fine	63.779 \| fine	5.253 \| good	0.377 \| good	6.727 \| good	0.309 \| good
2025-12-06T17:00:00.000Z	58 \| moderate	13 \| fine	54.297 \| good	7.3 \| good	0.426 \| good	7.117 \| good	0.27 \| good
2025-12-06T18:00:00.000Z	64 \| moderate	15.786 \| fine	60.657 \| fine	8.525 \| good	0.495 \| good	7.287 \| good	0.31 \| good
2025-12-06T19:00:00.000Z	66 \| moderate	17.224 \| fine	44.101 \| good	10.862 \| good	0.572 \| good	6.138 \| good	0.372 \| good
2025-12-06T20:00:00.000Z	66 \| moderate	16.95 \| fine	85.861 \| fine	11.254 \| good	0.554 \| good	5.405 \| good	0.352 \| good
2025-12-06T21:00:00.000Z	77 \| moderate	23.04 \| fine	64.457 \| fine	12.729 \| good	0.567 \| good	7.19 \| good	0.373 \| good
2025-12-06T22:00:00.000Z	66 \| moderate	17.067 \| fine	70.51 \| fine	13.326 \| good	0.566 \| good	7.31 \| good	0.352 \| good
2025-12-06T23:00:00.000Z	64 \| moderate	15.579 \| fine	47.663 \| good	12.349 \| good	0.474 \| good	6.781 \| good	0.31 \| good
2025-12-07T00:00:00.000Z	60 \| moderate	13.616 \| fine	53.801 \| good	14.41 \| good	0.514 \| good	8.017 \| good	0.31 \| good
2025-12-07T01:00:00.000Z	54 \| moderate	11.207 \| good	45.614 \| good	15.705 \| good	0.443 \| good	9.514 \| good	0.337 \| good
2025-12-07T02:00:00.000Z	52 \| moderate	9.826 \| good	45.77 \| good	12.597 \| good	0.382 \| good	9.976 \| good	0.374 \| good
2025-12-07T03:00:00.000Z	44 \| good	8.135 \| good	19.43 \| good	11.148 \| good	0.319 \| good	12.315 \| good	0.391 \| good
2025-12-07T04:00:00.000Z	52 \| moderate	9.694 \| good	24.862 \| good	11.572 \| good	0.313 \| good	12.155 \| good	0.49 \| good
2025-12-07T05:00:00.000Z	38 \| good	7.238 \| good	26.007 \| good	12.643 \| good	0.269 \| good	10.217 \| good	0.528 \| good
2025-12-07T06:00:00.000Z	60 \| moderate	13.533 \| fine	24.772 \| good	12.776 \| good	0.262 \| good	9.001 \| good	0.526 \| good
2025-12-07T07:00:00.000Z	60 \| moderate	13.774 \| fine	55.594 \| fine	8.614 \| good	0.266 \| good	9.097 \| good	0.512 \| good
2025-12-07T08:00:00.000Z	66 \| moderate	16.736 \| fine	62.945 \| fine	5.909 \| good	0.272 \| good	9.874 \| good	0.544 \| good
2025-12-07T09:00:00.000Z	71 \| moderate	20.211 \| fine	93.434 \| fine	8.245 \| good	0.327 \| good	7.768 \| good	0.466 \| good
2025-12-07T10:00:00.000Z	74 \| moderate	21.413 \| fine	100.911 \| fine	8.266 \| good	0.476 \| good	4.215 \| good	0.265 \| good
2025-12-07T11:00:00.000Z	58 \| moderate	12.539 \| fine	39.159 \| good	9.555 \| good	0.505 \| good	3.406 \| good	0.256 \| good
2025-12-07T12:00:00.000Z	64 \| moderate	16.259 \| fine	64.194 \| fine	5.14 \| good	0.335 \| good	7.336 \| good	0.215 \| good
2025-12-07T13:00:00.000Z	66 \| moderate	17.233 \| fine	66.707 \| fine	5.584 \| good	0.36 \| good	9.857 \| good	0.309 \| good
2025-12-07T14:00:00.000Z	71 \| moderate	19.86 \| fine	93.454 \| fine	9.064 \| good	0.444 \| good	11.928 \| good	0.471 \| good
2025-12-07T15:00:00.000Z	69 \| moderate	18.769 \| fine	71.145 \| fine	7.398 \| good	0.403 \| good	9.968 \| good	0.352 \| good
2025-12-07T16:00:00.000Z	62 \| moderate	15.499 \| fine	68.482 \| fine	6.115 \| good	0.345 \| good	13.299 \| good	0.332 \| good
2025-12-07T17:00:00.000Z	64 \| moderate	16.371 \| fine	35.535 \| good	5.239 \| good	0.365 \| good	11.073 \| good	0.373 \| good
2025-12-07T18:00:00.000Z	62 \| moderate	14.67 \| fine	28.875 \| good	5.119 \| good	0.36 \| good	11.775 \| good	0.368 \| good
2025-12-07T17:00:00.000Z	60 \| moderate	14.247 \| fine	63.909 \| fine	5.08 \| good	1.663 \| good	13.529 \| good	0.24 \| good
2025-12-07T18:00:00.000Z	52 \| moderate	10.101 \| good	44.903 \| good	8.035 \| good	1.821 \| good	12.446 \| good	0.245 \| good
2025-12-07T19:00:00.000Z	38 \| good	7.327 \| good	32.418 \| good	12.298 \| good	1.947 \| good	11.563 \| good	0.225 \| good
2025-12-07T20:00:00.000Z	33 \| good	6.077 \| good	26.452 \| good	16.322 \| good	2.073 \| good	10.68 \| good	0.205 \| good
2025-12-07T21:00:00.000Z	38 \| good	7.408 \| good	32.847 \| good	17.268 \| good	2.199 \| good	9.797 \| good	0.186 \| good
2025-12-07T22:00:00.000Z	38 \| good	6.588 \| good	28.866 \| good	18.375 \| good	2.041 \| good	10.572 \| good	0.179 \| good
2025-12-07T23:00:00.000Z	22 \| good	4.406 \| good	18.906 \| good	18.779 \| good	1.883 \| good	11.347 \| good	0.172 \| good
2025-12-08T00:00:00.000Z	19 \| good	2.247 \| good	9.325 \| good	20.565 \| good	1.725 \| good	12.123 \| good	0.166 \| good
2025-12-08T01:00:00.000Z	18 \| good	1.954 \| good	8.454 \| good	18.623 \| good	1.625 \| good	12.886 \| good	0.185 \| good
2025-12-08T02:00:00.000Z	17 \| good	1.288 \| good	5.208 \| good	17.547 \| good	1.525 \| good	13.65 \| good	0.205 \| good
2025-12-08T03:00:00.000Z	15 \| good	2.216 \| good	9.109 \| good	16.029 \| good	1.426 \| good	14.414 \| good	0.224 \| good
2025-12-08T04:00:00.000Z	15 \| good	1.791 \| good	7.458 \| good	16.483 \| good	1.52 \| good	14.286 \| good	0.229 \| good
2025-12-08T05:00:00.000Z	15 \| good	1.449 \| good	5.935 \| good	16.046 \| good	1.615 \| good	14.159 \| good	0.234 \| good
2025-12-08T06:00:00.000Z	13 \| good	2.134 \| good	8.775 \| good	13.241 \| good	1.709 \| good	14.031 \| good	0.239 \| good
2025-12-08T07:00:00.000Z	13 \| good	1.986 \| good	8.093 \| good	9.232 \| good	1.649 \| good	14 \| good	0.24 \| good
2025-12-08T08:00:00.000Z	27 \| good	4.524 \| good	19.54 \| good	4.464 \| good	1.589 \| good	13.968 \| good	0.24 \| good
2025-12-08T09:00:00.000Z	44 \| good	7.816 \| good	34.5 \| good	2.844 \| good	1.529 \| good	13.937 \| good	0.241 \| good
2025-12-08T10:00:00.000Z	52 \| moderate	10.097 \| good	44.624 \| good	1.795 \| good	1.484 \| good	13.483 \| good	0.239 \| good
2025-12-08T11:00:00.000Z	58 \| moderate	13.073 \| fine	58.861 \| fine	1.299 \| good	1.44 \| good	13.029 \| good	0.237 \| good
2025-12-08T12:00:00.000Z	64 \| moderate	15.723 \| fine	69.881 \| fine	1.416 \| good	1.395 \| good	12.575 \| good	0.235 \| good
2025-12-08T13:00:00.000Z	67 \| moderate	17.934 \| fine	79.71 \| fine	1.33 \| good	1.54 \| good	12.339 \| good	0.242 \| good
2025-12-08T14:00:00.000Z	71 \| moderate	19.991 \| fine	87.789 \| fine	1.005 \| good	1.685 \| good	12.103 \| good	0.249 \| good
2025-12-08T15:00:00.000Z	69 \| moderate	19.484 \| fine	85.621 \| fine	0.995 \| good	1.83 \| good	11.867 \| good	0.255 \| good
2025-12-08T16:00:00.000Z	71 \| moderate	19.548 \| fine	86.574 \| fine	3.417 \| good	2.4 \| good	12.234 \| good	0.248 \| good
2025-12-08T17:00:00.000Z	62 \| moderate	15.218 \| fine	67.86 \| fine	6.298 \| good	2.971 \| good	12.6 \| good	0.241 \| good
2025-12-08T18:00:00.000Z	56 \| moderate	12.371 \| fine	55.427 \| fine	8.252 \| good	3.542 \| good	12.967 \| good	0.233 \| good
2025-12-08T19:00:00.000Z	52 \| moderate	9.602 \| good	42.744 \| good	11.669 \| good	3.323 \| good	11.603 \| good	0.211 \| good
2025-12-08T20:00:00.000Z	49 \| good	8.825 \| good	38.633 \| good	14.451 \| good	3.104 \| good	10.24 \| good	0.188 \| good
2025-12-08T21:00:00.000Z	52 \| moderate	9.986 \| good	43.956 \| good	15.283 \| good	2.885 \| good	8.876 \| good	0.165 \| good
2025-12-08T22:00:00.000Z	54 \| moderate	11.178 \| good	49.435 \| good	16.148 \| good	2.56 \| good	9.096 \| good	0.161 \| good
2025-12-08T23:00:00.000Z	54 \| moderate	11.305 \| good	50.574 \| good	16.575 \| good	2.234 \| good	9.315 \| good	0.156 \| good
2025-12-09T00:00:00.000Z	38 \| good	6.578 \| good	28.872 \| good	18.701 \| good	1.909 \| good	9.534 \| good	0.152 \| good
2025-12-09T01:00:00.000Z	27 \| good	5.297 \| good	23.061 \| good	15.925 \| good	1.718 \| good	10.929 \| good	0.175 \| good
2025-12-09T02:00:00.000Z	22 \| good	3.949 \| good	17.091 \| good	15.31 \| good	1.526 \| good	12.324 \| good	0.197 \| good
2025-12-09T03:00:00.000Z	27 \| good	4.751 \| good	20.602 \| good	15.636 \| good	1.335 \| good	13.719 \| good	0.22 \| good
2025-12-09T04:00:00.000Z	22 \| good	3.712 \| good	16.33 \| good	16.509 \| good	1.38 \| good	12.71 \| good	0.224 \| good
2025-12-09T05:00:00.000Z	22 \| good	3.649 \| good	15.633 \| good	18.205 \| good	1.425 \| good	11.702 \| good	0.228 \| good
2025-12-09T06:00:00.000Z	18 \| good	2.279 \| good	9.402 \| good	19.143 \| good	1.47 \| good	10.693 \| good	0.232 \| good
2025-12-09T07:00:00.000Z	17 \| good	2.533 \| good	10.364 \| good	18.392 \| good	1.403 \| good	10.267 \| good	0.232 \| good
2025-12-09T08:00:00.000Z	16 \| good	2.119 \| good	8.797 \| good	16.792 \| good	1.337 \| good	9.842 \| good	0.233 \| good
2025-12-09T09:00:00.000Z	27 \| good	4.679 \| good	20.465 \| good	12.78 \| good	1.27 \| good	9.416 \| good	0.233 \| good
2025-12-09T10:00:00.000Z	33 \| good	5.919 \| good	26.03 \| good	8.681 \| good	1.175 \| good	8.872 \| good	0.226 \| good
2025-12-09T11:00:00.000Z	38 \| good	6.723 \| good	29.685 \| good	5.307 \| good	1.08 \| good	8.328 \| good	0.218 \| good
2025-12-09T12:00:00.000Z	49 \| good	9.279 \| good	41.144 \| good	3.089 \| good	0.985 \| good	7.784 \| good	0.21 \| good
2025-12-09T13:00:00.000Z	56 \| moderate	11.65 \| good	52.041 \| good	2.343 \| good	1.061 \| good	8.072 \| good	0.211 \| good
2025-12-09T14:00:00.000Z	58 \| moderate	13.319 \| fine	59.382 \| fine	2.316 \| good	1.138 \| good	8.36 \| good	0.211 \| good
2025-12-09T15:00:00.000Z	56 \| moderate	11.818 \| good	53.484 \| good	2.999 \| good	1.214 \| good	8.647 \| good	0.212 \| good
2025-12-09T16:00:00.000Z	49 \| good	8.669 \| good	38.418 \| good	5.795 \| good	1.223 \| good	8.168 \| good	0.211 \| good

Current air quality index in Hillsborough, California today

Common air pollutants in Hillsborough, California

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Hillsborough, California air quality forecast and history

Empower business decisions with accurate air quality data

Real-time air quality map: Monitor AQI near Hillsborough, California

Air quality in nearby cities

Burlingame, California

Millbrae, California

San Mateo, California

San Bruno, California

South San Francisco, California

Foster City, California

How accurate is California, USA air quality data?

Air quality levels in US

Frequently asked questions

How frequently does the air quality data for Hillsborough, California get updated?

What time in the past 24 hours saw the poorest air quality in Hillsborough, California?

When was air quality in Hillsborough, California the best over the past 24 hours?

What is the air quality in Hillsborough, California right now?

What pollutant is most frequently found in Hillsborough, California?

What can I do if the air quality in Hillsborough, California is poor?

What is the PM2.5 concentration in Hillsborough, California right now?

What is the current level of PM10 in Hillsborough, California?

What is the current level of carbon monoxide (CO) in Hillsborough, California?

What is the current level of sulfur dioxide (SO2) in Hillsborough, California?

What is the current level of ozone (O3) in Hillsborough, California?

What is the current level of nitrogen dioxide (NO2) in Hillsborough, California?

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What is the PM_2.5 concentration in Hillsborough, California right now?

What is the current level of PM₁₀ in Hillsborough, California?

What is the current level of sulfur dioxide (SO₂) in Hillsborough, California?

What is the current level of ozone (O₃) in Hillsborough, California?

What is the current level of nitrogen dioxide (NO₂) in Hillsborough, California?