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

Hillsborough, California currently has a PM10 concentration of 17.402 μg/m3.

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

The current sulfur dioxide (SO2) concentration in Hillsborough, California is 0.308 ppb.

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

Hillsborough, California currently has an ozone (O3) concentration of 26.861 ppm.

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

The current level of nitrogen dioxide (NO2) in Hillsborough, California is 2.509 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 4.476 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)

Good

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)

4.48 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

17.40 μg/m³

155

255

425

605+

Ozone (O₃)

26.86 ppb

201

201+

Sulfur Dioxide (SO₂)

0.31 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

2.51 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.32 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
2026-07-26T07:00:00.000Z	25 \| good	4.29 \| good	22.617 \| good	27.025 \| good	0.31 \| good	3.684 \| good	0.294 \| good
2026-07-26T08:00:00.000Z	26 \| good	4.402 \| good	27.636 \| good	26.924 \| good	0.352 \| good	3.202 \| good	0.277 \| good
2026-07-26T09:00:00.000Z	22 \| good	4.255 \| good	24.161 \| good	19.115 \| good	0.352 \| good	2.473 \| good	0.277 \| good
2026-07-26T10:00:00.000Z	27 \| good	5.055 \| good	29.164 \| good	19.781 \| good	0.527 \| good	3.349 \| good	0.133 \| good
2026-07-26T11:00:00.000Z	33 \| good	5.908 \| good	27.335 \| good	21.995 \| good	0.501 \| good	3.025 \| good	0.133 \| good
2026-07-26T12:00:00.000Z	22 \| good	4.253 \| good	18.661 \| good	24.157 \| good	0.247 \| good	1.44 \| good	0.226 \| good
2026-07-26T13:00:00.000Z	17 \| good	2.889 \| good	11.124 \| good	18.388 \| good	0.327 \| good	2.13 \| good	0.244 \| good
2026-07-26T14:00:00.000Z	18 \| good	2.995 \| good	11.007 \| good	18.817 \| good	0.323 \| good	3.354 \| good	0.268 \| good
2026-07-26T15:00:00.000Z	16 \| good	3.401 \| good	13.792 \| good	16.372 \| good	0.376 \| good	1.798 \| good	0.244 \| good
2026-07-26T16:00:00.000Z	22 \| good	3.89 \| good	17.712 \| good	16.668 \| good	0.359 \| good	1.347 \| good	0.261 \| good
2026-07-26T17:00:00.000Z	16 \| good	2.872 \| good	12.888 \| good	14.77 \| good	0.411 \| good	1.272 \| good	0.285 \| good
2026-07-26T18:00:00.000Z	16 \| good	3.49 \| good	9.472 \| good	15.432 \| good	0.397 \| good	1.056 \| good	0.3 \| good
2026-07-26T19:00:00.000Z	22 \| good	4.366 \| good	21.054 \| good	16.376 \| good	0.406 \| good	1.075 \| good	0.292 \| good
2026-07-26T20:00:00.000Z	17 \| good	1.879 \| good	8.056 \| good	17.55 \| good	0.4 \| good	1.44 \| good	0.3 \| good
2026-07-26T21:00:00.000Z	22 \| good	4.389 \| good	17.258 \| good	19.064 \| good	0.39 \| good	1.546 \| good	0.3 \| good
2026-07-26T22:00:00.000Z	22 \| good	3.651 \| good	7.805 \| good	19.033 \| good	0.328 \| good	1.341 \| good	0.3 \| good
2026-07-26T23:00:00.000Z	22 \| good	4.147 \| good	10.296 \| good	19.636 \| good	0.391 \| good	1.424 \| good	0.277 \| good
2026-07-27T00:00:00.000Z	33 \| good	6.309 \| good	27.912 \| good	20.018 \| good	0.465 \| good	1.45 \| good	0.277 \| good
2026-07-27T01:00:00.000Z	33 \| good	6.185 \| good	26.85 \| good	20.135 \| good	0.413 \| good	1.521 \| good	0.277 \| good
2026-07-27T02:00:00.000Z	22 \| good	3.665 \| good	19.795 \| good	20.406 \| good	0.443 \| good	1.476 \| good	0.317 \| good
2026-07-27T03:00:00.000Z	33 \| good	5.739 \| good	24.984 \| good	22.373 \| good	0.26 \| good	4.167 \| good	0.093 \| good
2026-07-27T04:00:00.000Z	21 \| good	2.685 \| good	14.484 \| good	22.998 \| good	0.333 \| good	1.668 \| good	0.294 \| good
2026-07-27T05:00:00.000Z	21 \| good	3.344 \| good	13.237 \| good	23.112 \| good	0.321 \| good	2.918 \| good	0.317 \| good
2026-07-27T06:00:00.000Z	27 \| good	4.086 \| good	15.925 \| good	29.163 \| good	0.343 \| good	3.325 \| good	0.277 \| good
2026-07-27T07:00:00.000Z	23 \| good	3.929 \| good	16.766 \| good	25.191 \| good	0.343 \| good	2.823 \| good	0.277 \| good
2026-07-27T08:00:00.000Z	22 \| good	3.703 \| good	15.403 \| good	24.152 \| good	0.333 \| good	1.771 \| good	0.258 \| good
2026-07-27T09:00:00.000Z	19 \| good	3.042 \| good	12.171 \| good	20.794 \| good	0.298 \| good	1.745 \| good	0.261 \| good
2026-07-27T10:00:00.000Z	19 \| good	2.64 \| good	10.563 \| good	19.683 \| good	0.327 \| good	1.907 \| good	0.261 \| good
2026-07-27T11:00:00.000Z	19 \| good	2.186 \| good	9.856 \| good	19.734 \| good	0.313 \| good	1.591 \| good	0.244 \| good
2026-07-27T12:00:00.000Z	19 \| good	1.621 \| good	3.433 \| good	20.77 \| good	0.313 \| good	1.651 \| good	0.244 \| good
2026-07-27T13:00:00.000Z	18 \| good	1.815 \| good	9.842 \| good	19.391 \| good	0.27 \| good	2.606 \| good	0.244 \| good
2026-07-27T14:00:00.000Z	17 \| good	3.131 \| good	13.981 \| good	18.37 \| good	0.351 \| good	4.608 \| good	0.311 \| good
2026-07-27T15:00:00.000Z	16 \| good	2.678 \| good	12.168 \| good	15.866 \| good	0.351 \| good	4.223 \| good	0.311 \| good
2026-07-27T16:00:00.000Z	17 \| good	3.235 \| good	11.363 \| good	18.322 \| good	0.373 \| good	2.366 \| good	0.261 \| good
2026-07-27T17:00:00.000Z	18 \| good	2.171 \| good	7.909 \| good	18.707 \| good	0.418 \| good	2.134 \| good	0.261 \| good
2026-07-27T18:00:00.000Z	18 \| good	3.311 \| good	15.563 \| good	18.9 \| good	0.401 \| good	2.037 \| good	0.317 \| good
2026-07-27T19:00:00.000Z	19 \| good	3.466 \| good	20.365 \| good	18.709 \| good	0.371 \| good	1.876 \| good	0.317 \| good
2026-07-27T20:00:00.000Z	19 \| good	3.342 \| good	16.846 \| good	19.874 \| good	0.378 \| good	2.8 \| good	0.3 \| good
2026-07-27T21:00:00.000Z	24 \| good	4.22 \| good	25.795 \| good	21.054 \| good	0.39 \| good	2.368 \| good	0.3 \| good
2026-07-27T22:00:00.000Z	27 \| good	4.517 \| good	23.041 \| good	22.045 \| good	0.435 \| good	2.204 \| good	0.3 \| good
2026-07-27T23:00:00.000Z	20 \| good	3.458 \| good	22.096 \| good	22.155 \| good	0.36 \| good	2.503 \| good	0.317 \| good
2026-07-28T00:00:00.000Z	35 \| good	4.801 \| good	37.884 \| good	23.027 \| good	0.433 \| good	2.626 \| good	0.29 \| good
2026-07-28T01:00:00.000Z	22 \| good	4.061 \| good	18.154 \| good	22.743 \| good	0.434 \| good	2.922 \| good	0.273 \| good
2026-07-28T02:00:00.000Z	27 \| good	4.744 \| good	25.832 \| good	25.354 \| good	0.398 \| good	1.946 \| good	0.29 \| good
2026-07-28T03:00:00.000Z	23 \| good	4.277 \| good	18.688 \| good	24.92 \| good	0.363 \| good	2.128 \| good	0.267 \| good
2026-07-28T04:00:00.000Z	24 \| good	4.166 \| good	15.563 \| good	25.578 \| good	0.358 \| good	2.823 \| good	0.317 \| good
2026-07-28T05:00:00.000Z	27 \| good	4.646 \| good	19.804 \| good	24.07 \| good	0.324 \| good	4.646 \| good	0.317 \| good
2026-07-28T06:00:00.000Z	25 \| good	4.476 \| good	17.402 \| good	26.861 \| good	0.308 \| good	2.509 \| good	0.317 \| good
2026-07-28T06:00:00.000Z	25 \| good	4.476 \| good	17.402 \| good	26.861 \| good	0.308 \| good	2.509 \| good	0.317 \| good
2026-07-28T07:00:00.000Z	19 \| good	2.716 \| good	11.198 \| good	20.786 \| good	0.252 \| good	4.409 \| good	0.073 \| good
2026-07-28T08:00:00.000Z	19 \| good	2.46 \| good	9.968 \| good	19.874 \| good	0.236 \| good	3.936 \| good	0.072 \| good
2026-07-28T09:00:00.000Z	19 \| good	2.342 \| good	9.839 \| good	19.521 \| good	0.228 \| good	3.599 \| good	0.072 \| good
2026-07-28T10:00:00.000Z	18 \| good	2.426 \| good	10.031 \| good	19.311 \| good	0.223 \| good	3.262 \| good	0.071 \| good
2026-07-28T11:00:00.000Z	18 \| good	2.854 \| good	11.506 \| good	18.958 \| good	0.215 \| good	3.075 \| good	0.07 \| good
2026-07-28T12:00:00.000Z	16 \| good	2.493 \| good	10.303 \| good	17.079 \| good	0.208 \| good	2.983 \| good	0.07 \| good
2026-07-28T13:00:00.000Z	16 \| good	3.068 \| good	13.185 \| good	15.622 \| good	0.202 \| good	2.966 \| good	0.07 \| good
2026-07-28T14:00:00.000Z	22 \| good	3.894 \| good	17.126 \| good	15.454 \| good	0.196 \| good	2.677 \| good	0.07 \| good
2026-07-28T15:00:00.000Z	33 \| good	5.611 \| good	24.155 \| good	16.517 \| good	0.214 \| good	2.097 \| good	0.068 \| good
2026-07-28T16:00:00.000Z	27 \| good	5.463 \| good	23.897 \| good	17.806 \| good	0.228 \| good	2.26 \| good	0.071 \| good
2026-07-28T17:00:00.000Z	33 \| good	5.612 \| good	24.285 \| good	19.12 \| good	0.248 \| good	2.398 \| good	0.073 \| good
2026-07-28T18:00:00.000Z	33 \| good	6.405 \| good	28.106 \| good	20.933 \| good	0.262 \| good	2.287 \| good	0.074 \| good
2026-07-28T19:00:00.000Z	27 \| good	5.252 \| good	22.536 \| good	21.502 \| good	0.274 \| good	1.983 \| good	0.072 \| good
2026-07-28T20:00:00.000Z	27 \| good	4.773 \| good	20.952 \| good	20.947 \| good	0.284 \| good	1.743 \| good	0.071 \| good
2026-07-28T21:00:00.000Z	27 \| good	4.72 \| good	20.371 \| good	20.42 \| good	0.276 \| good	1.68 \| good	0.07 \| good
2026-07-28T22:00:00.000Z	22 \| good	4.266 \| good	18.682 \| good	20.65 \| good	0.269 \| good	1.704 \| good	0.07 \| good
2026-07-28T23:00:00.000Z	27 \| good	4.882 \| good	21.08 \| good	20.278 \| good	0.262 \| good	1.809 \| good	0.07 \| good
2026-07-29T00:00:00.000Z	27 \| good	5.083 \| good	22.011 \| good	20.733 \| good	0.255 \| good	2.066 \| good	0.071 \| good
2026-07-29T01:00:00.000Z	27 \| good	5.168 \| good	22.134 \| good	20.484 \| good	0.242 \| good	2.677 \| good	0.075 \| good
2026-07-29T02:00:00.000Z	27 \| good	5.007 \| good	21.45 \| good	19.777 \| good	0.233 \| good	3.434 \| good	0.078 \| good
2026-07-29T03:00:00.000Z	22 \| good	4.368 \| good	19.183 \| good	19.237 \| good	0.222 \| good	4.365 \| good	0.079 \| good
2026-07-29T04:00:00.000Z	22 \| good	3.598 \| good	15.477 \| good	19.091 \| good	0.222 \| good	4.652 \| good	0.08 \| good
2026-07-29T05:00:00.000Z	18 \| good	3.108 \| good	12.971 \| good	18.611 \| good	0.222 \| good	4.342 \| good	0.079 \| good
2026-07-29T06:00:00.000Z	18 \| good	2.959 \| good	12.211 \| good	18.797 \| good	0.221 \| good	4.137 \| good	0.079 \| good
2026-07-29T07:00:00.000Z	18 \| good	3.294 \| good	14.3 \| good	19.354 \| good	0.213 \| good	4.338 \| good	0.081 \| good
2026-07-29T08:00:00.000Z	18 \| good	2.823 \| good	11.817 \| good	18.751 \| good	0.201 \| good	3.984 \| good	0.08 \| good
2026-07-29T09:00:00.000Z	17 \| good	2.707 \| good	11.292 \| good	17.904 \| good	0.197 \| good	3.738 \| good	0.08 \| good
2026-07-29T10:00:00.000Z	16 \| good	2.334 \| good	9.452 \| good	17.308 \| good	0.196 \| good	3.586 \| good	0.079 \| good
2026-07-29T11:00:00.000Z	16 \| good	2.867 \| good	11.757 \| good	17.042 \| good	0.196 \| good	3.551 \| good	0.079 \| good
2026-07-29T12:00:00.000Z	16 \| good	2.543 \| good	10.724 \| good	14.469 \| good	0.197 \| good	3.549 \| good	0.079 \| good
2026-07-29T13:00:00.000Z	14 \| good	2.338 \| good	9.455 \| good	15.301 \| good	0.201 \| good	3.566 \| good	0.079 \| good
2026-07-29T14:00:00.000Z	16 \| good	2.61 \| good	11.018 \| good	15.72 \| good	0.197 \| good	2.558 \| good	0.077 \| good
2026-07-29T15:00:00.000Z	22 \| good	3.937 \| good	16.931 \| good	15.978 \| good	0.2 \| good	2.612 \| good	0.08 \| good
2026-07-29T16:00:00.000Z	22 \| good	4.135 \| good	18.155 \| good	16.113 \| good	0.216 \| good	2.981 \| good	0.088 \| good
2026-07-29T17:00:00.000Z	27 \| good	5.447 \| good	23.411 \| good	17.078 \| good	0.234 \| good	3.047 \| good	0.093 \| good
2026-07-29T18:00:00.000Z	27 \| good	5.45 \| good	23.517 \| good	19.293 \| good	0.253 \| good	2.901 \| good	0.095 \| good
2026-07-29T19:00:00.000Z	27 \| good	5.371 \| good	23.182 \| good	20.75 \| good	0.27 \| good	2.706 \| good	0.095 \| good
2026-07-29T20:00:00.000Z	27 \| good	4.594 \| good	20.15 \| good	20.347 \| good	0.285 \| good	2.447 \| good	0.094 \| good
2026-07-29T21:00:00.000Z	33 \| good	5.52 \| good	24.09 \| good	19.502 \| good	0.291 \| good	2.156 \| good	0.092 \| good
2026-07-29T22:00:00.000Z	27 \| good	5.414 \| good	23.722 \| good	19.037 \| good	0.289 \| good	1.945 \| good	0.09 \| good
2026-07-29T23:00:00.000Z	33 \| good	5.512 \| good	23.999 \| good	18.712 \| good	0.271 \| good	1.881 \| good	0.089 \| good
2026-07-30T00:00:00.000Z	33 \| good	6.098 \| good	26.774 \| good	19.9 \| good	0.259 \| good	1.962 \| good	0.089 \| good
2026-07-30T01:00:00.000Z	33 \| good	5.801 \| good	25.364 \| good	19.967 \| good	0.246 \| good	2.492 \| good	0.091 \| good
2026-07-30T02:00:00.000Z	27 \| good	5.232 \| good	22.362 \| good	19.817 \| good	0.241 \| good	3.521 \| good	0.095 \| good
2026-07-30T03:00:00.000Z	27 \| good	4.773 \| good	20.657 \| good	19.133 \| good	0.238 \| good	5.057 \| good	0.096 \| good
2026-07-30T04:00:00.000Z	27 \| good	4.516 \| good	19.619 \| good	19.49 \| good	0.246 \| good	5.904 \| good	0.096 \| good
2026-07-30T05:00:00.000Z	27 \| good	4.823 \| good	20.727 \| good	20.068 \| good	0.259 \| good	5.766 \| good	0.094 \| good
2026-07-30T06:00:00.000Z	52 \| moderate	9.597 \| good	14.787 \| good	19.728 \| good	0.259 \| good	5.641 \| good	0.093 \| good

Hillsborough

Empower business decisions with accurate air quality data

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

0.30ppm

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 12:00:00, 2026-07-28.

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

The best air quality in Hillsborough, California was observed at 03:00:00 on 2026-07-27.

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

The air quality in Hillsborough, California right now is Good, with an AQI of 25.

What pollutant is most frequently found in Hillsborough, California?

In Hillsborough, California, O3 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 4.476 μg/m³.

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

Hillsborough, California currently has a PM₁₀ concentration of 17.402 μg/m³.

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

The current carbon monoxide (CO) level in Hillsborough, California is 0.317 ppm.

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

The current sulfur dioxide (SO₂) concentration in Hillsborough, California is 0.308 ppb.

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

Hillsborough, California currently has an ozone (O₃) concentration of 26.861 ppm.

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

The current level of nitrogen dioxide (NO₂) in Hillsborough, California is 2.509 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-07-26T07:00:00.000Z	25 \| good	4.29 \| good	22.617 \| good	27.025 \| good	0.31 \| good	3.684 \| good	0.294 \| good
2026-07-26T08:00:00.000Z	26 \| good	4.402 \| good	27.636 \| good	26.924 \| good	0.352 \| good	3.202 \| good	0.277 \| good
2026-07-26T09:00:00.000Z	22 \| good	4.255 \| good	24.161 \| good	19.115 \| good	0.352 \| good	2.473 \| good	0.277 \| good
2026-07-26T10:00:00.000Z	27 \| good	5.055 \| good	29.164 \| good	19.781 \| good	0.527 \| good	3.349 \| good	0.133 \| good
2026-07-26T11:00:00.000Z	33 \| good	5.908 \| good	27.335 \| good	21.995 \| good	0.501 \| good	3.025 \| good	0.133 \| good
2026-07-26T12:00:00.000Z	22 \| good	4.253 \| good	18.661 \| good	24.157 \| good	0.247 \| good	1.44 \| good	0.226 \| good
2026-07-26T13:00:00.000Z	17 \| good	2.889 \| good	11.124 \| good	18.388 \| good	0.327 \| good	2.13 \| good	0.244 \| good
2026-07-26T14:00:00.000Z	18 \| good	2.995 \| good	11.007 \| good	18.817 \| good	0.323 \| good	3.354 \| good	0.268 \| good
2026-07-26T15:00:00.000Z	16 \| good	3.401 \| good	13.792 \| good	16.372 \| good	0.376 \| good	1.798 \| good	0.244 \| good
2026-07-26T16:00:00.000Z	22 \| good	3.89 \| good	17.712 \| good	16.668 \| good	0.359 \| good	1.347 \| good	0.261 \| good
2026-07-26T17:00:00.000Z	16 \| good	2.872 \| good	12.888 \| good	14.77 \| good	0.411 \| good	1.272 \| good	0.285 \| good
2026-07-26T18:00:00.000Z	16 \| good	3.49 \| good	9.472 \| good	15.432 \| good	0.397 \| good	1.056 \| good	0.3 \| good
2026-07-26T19:00:00.000Z	22 \| good	4.366 \| good	21.054 \| good	16.376 \| good	0.406 \| good	1.075 \| good	0.292 \| good
2026-07-26T20:00:00.000Z	17 \| good	1.879 \| good	8.056 \| good	17.55 \| good	0.4 \| good	1.44 \| good	0.3 \| good
2026-07-26T21:00:00.000Z	22 \| good	4.389 \| good	17.258 \| good	19.064 \| good	0.39 \| good	1.546 \| good	0.3 \| good
2026-07-26T22:00:00.000Z	22 \| good	3.651 \| good	7.805 \| good	19.033 \| good	0.328 \| good	1.341 \| good	0.3 \| good
2026-07-26T23:00:00.000Z	22 \| good	4.147 \| good	10.296 \| good	19.636 \| good	0.391 \| good	1.424 \| good	0.277 \| good
2026-07-27T00:00:00.000Z	33 \| good	6.309 \| good	27.912 \| good	20.018 \| good	0.465 \| good	1.45 \| good	0.277 \| good
2026-07-27T01:00:00.000Z	33 \| good	6.185 \| good	26.85 \| good	20.135 \| good	0.413 \| good	1.521 \| good	0.277 \| good
2026-07-27T02:00:00.000Z	22 \| good	3.665 \| good	19.795 \| good	20.406 \| good	0.443 \| good	1.476 \| good	0.317 \| good
2026-07-27T03:00:00.000Z	33 \| good	5.739 \| good	24.984 \| good	22.373 \| good	0.26 \| good	4.167 \| good	0.093 \| good
2026-07-27T04:00:00.000Z	21 \| good	2.685 \| good	14.484 \| good	22.998 \| good	0.333 \| good	1.668 \| good	0.294 \| good
2026-07-27T05:00:00.000Z	21 \| good	3.344 \| good	13.237 \| good	23.112 \| good	0.321 \| good	2.918 \| good	0.317 \| good
2026-07-27T06:00:00.000Z	27 \| good	4.086 \| good	15.925 \| good	29.163 \| good	0.343 \| good	3.325 \| good	0.277 \| good
2026-07-27T07:00:00.000Z	23 \| good	3.929 \| good	16.766 \| good	25.191 \| good	0.343 \| good	2.823 \| good	0.277 \| good
2026-07-27T08:00:00.000Z	22 \| good	3.703 \| good	15.403 \| good	24.152 \| good	0.333 \| good	1.771 \| good	0.258 \| good
2026-07-27T09:00:00.000Z	19 \| good	3.042 \| good	12.171 \| good	20.794 \| good	0.298 \| good	1.745 \| good	0.261 \| good
2026-07-27T10:00:00.000Z	19 \| good	2.64 \| good	10.563 \| good	19.683 \| good	0.327 \| good	1.907 \| good	0.261 \| good
2026-07-27T11:00:00.000Z	19 \| good	2.186 \| good	9.856 \| good	19.734 \| good	0.313 \| good	1.591 \| good	0.244 \| good
2026-07-27T12:00:00.000Z	19 \| good	1.621 \| good	3.433 \| good	20.77 \| good	0.313 \| good	1.651 \| good	0.244 \| good
2026-07-27T13:00:00.000Z	18 \| good	1.815 \| good	9.842 \| good	19.391 \| good	0.27 \| good	2.606 \| good	0.244 \| good
2026-07-27T14:00:00.000Z	17 \| good	3.131 \| good	13.981 \| good	18.37 \| good	0.351 \| good	4.608 \| good	0.311 \| good
2026-07-27T15:00:00.000Z	16 \| good	2.678 \| good	12.168 \| good	15.866 \| good	0.351 \| good	4.223 \| good	0.311 \| good
2026-07-27T16:00:00.000Z	17 \| good	3.235 \| good	11.363 \| good	18.322 \| good	0.373 \| good	2.366 \| good	0.261 \| good
2026-07-27T17:00:00.000Z	18 \| good	2.171 \| good	7.909 \| good	18.707 \| good	0.418 \| good	2.134 \| good	0.261 \| good
2026-07-27T18:00:00.000Z	18 \| good	3.311 \| good	15.563 \| good	18.9 \| good	0.401 \| good	2.037 \| good	0.317 \| good
2026-07-27T19:00:00.000Z	19 \| good	3.466 \| good	20.365 \| good	18.709 \| good	0.371 \| good	1.876 \| good	0.317 \| good
2026-07-27T20:00:00.000Z	19 \| good	3.342 \| good	16.846 \| good	19.874 \| good	0.378 \| good	2.8 \| good	0.3 \| good
2026-07-27T21:00:00.000Z	24 \| good	4.22 \| good	25.795 \| good	21.054 \| good	0.39 \| good	2.368 \| good	0.3 \| good
2026-07-27T22:00:00.000Z	27 \| good	4.517 \| good	23.041 \| good	22.045 \| good	0.435 \| good	2.204 \| good	0.3 \| good
2026-07-27T23:00:00.000Z	20 \| good	3.458 \| good	22.096 \| good	22.155 \| good	0.36 \| good	2.503 \| good	0.317 \| good
2026-07-28T00:00:00.000Z	35 \| good	4.801 \| good	37.884 \| good	23.027 \| good	0.433 \| good	2.626 \| good	0.29 \| good
2026-07-28T01:00:00.000Z	22 \| good	4.061 \| good	18.154 \| good	22.743 \| good	0.434 \| good	2.922 \| good	0.273 \| good
2026-07-28T02:00:00.000Z	27 \| good	4.744 \| good	25.832 \| good	25.354 \| good	0.398 \| good	1.946 \| good	0.29 \| good
2026-07-28T03:00:00.000Z	23 \| good	4.277 \| good	18.688 \| good	24.92 \| good	0.363 \| good	2.128 \| good	0.267 \| good
2026-07-28T04:00:00.000Z	24 \| good	4.166 \| good	15.563 \| good	25.578 \| good	0.358 \| good	2.823 \| good	0.317 \| good
2026-07-28T05:00:00.000Z	27 \| good	4.646 \| good	19.804 \| good	24.07 \| good	0.324 \| good	4.646 \| good	0.317 \| good
2026-07-28T06:00:00.000Z	25 \| good	4.476 \| good	17.402 \| good	26.861 \| good	0.308 \| good	2.509 \| good	0.317 \| good
2026-07-28T06:00:00.000Z	25 \| good	4.476 \| good	17.402 \| good	26.861 \| good	0.308 \| good	2.509 \| good	0.317 \| good
2026-07-28T07:00:00.000Z	19 \| good	2.716 \| good	11.198 \| good	20.786 \| good	0.252 \| good	4.409 \| good	0.073 \| good
2026-07-28T08:00:00.000Z	19 \| good	2.46 \| good	9.968 \| good	19.874 \| good	0.236 \| good	3.936 \| good	0.072 \| good
2026-07-28T09:00:00.000Z	19 \| good	2.342 \| good	9.839 \| good	19.521 \| good	0.228 \| good	3.599 \| good	0.072 \| good
2026-07-28T10:00:00.000Z	18 \| good	2.426 \| good	10.031 \| good	19.311 \| good	0.223 \| good	3.262 \| good	0.071 \| good
2026-07-28T11:00:00.000Z	18 \| good	2.854 \| good	11.506 \| good	18.958 \| good	0.215 \| good	3.075 \| good	0.07 \| good
2026-07-28T12:00:00.000Z	16 \| good	2.493 \| good	10.303 \| good	17.079 \| good	0.208 \| good	2.983 \| good	0.07 \| good
2026-07-28T13:00:00.000Z	16 \| good	3.068 \| good	13.185 \| good	15.622 \| good	0.202 \| good	2.966 \| good	0.07 \| good
2026-07-28T14:00:00.000Z	22 \| good	3.894 \| good	17.126 \| good	15.454 \| good	0.196 \| good	2.677 \| good	0.07 \| good
2026-07-28T15:00:00.000Z	33 \| good	5.611 \| good	24.155 \| good	16.517 \| good	0.214 \| good	2.097 \| good	0.068 \| good
2026-07-28T16:00:00.000Z	27 \| good	5.463 \| good	23.897 \| good	17.806 \| good	0.228 \| good	2.26 \| good	0.071 \| good
2026-07-28T17:00:00.000Z	33 \| good	5.612 \| good	24.285 \| good	19.12 \| good	0.248 \| good	2.398 \| good	0.073 \| good
2026-07-28T18:00:00.000Z	33 \| good	6.405 \| good	28.106 \| good	20.933 \| good	0.262 \| good	2.287 \| good	0.074 \| good
2026-07-28T19:00:00.000Z	27 \| good	5.252 \| good	22.536 \| good	21.502 \| good	0.274 \| good	1.983 \| good	0.072 \| good
2026-07-28T20:00:00.000Z	27 \| good	4.773 \| good	20.952 \| good	20.947 \| good	0.284 \| good	1.743 \| good	0.071 \| good
2026-07-28T21:00:00.000Z	27 \| good	4.72 \| good	20.371 \| good	20.42 \| good	0.276 \| good	1.68 \| good	0.07 \| good
2026-07-28T22:00:00.000Z	22 \| good	4.266 \| good	18.682 \| good	20.65 \| good	0.269 \| good	1.704 \| good	0.07 \| good
2026-07-28T23:00:00.000Z	27 \| good	4.882 \| good	21.08 \| good	20.278 \| good	0.262 \| good	1.809 \| good	0.07 \| good
2026-07-29T00:00:00.000Z	27 \| good	5.083 \| good	22.011 \| good	20.733 \| good	0.255 \| good	2.066 \| good	0.071 \| good
2026-07-29T01:00:00.000Z	27 \| good	5.168 \| good	22.134 \| good	20.484 \| good	0.242 \| good	2.677 \| good	0.075 \| good
2026-07-29T02:00:00.000Z	27 \| good	5.007 \| good	21.45 \| good	19.777 \| good	0.233 \| good	3.434 \| good	0.078 \| good
2026-07-29T03:00:00.000Z	22 \| good	4.368 \| good	19.183 \| good	19.237 \| good	0.222 \| good	4.365 \| good	0.079 \| good
2026-07-29T04:00:00.000Z	22 \| good	3.598 \| good	15.477 \| good	19.091 \| good	0.222 \| good	4.652 \| good	0.08 \| good
2026-07-29T05:00:00.000Z	18 \| good	3.108 \| good	12.971 \| good	18.611 \| good	0.222 \| good	4.342 \| good	0.079 \| good
2026-07-29T06:00:00.000Z	18 \| good	2.959 \| good	12.211 \| good	18.797 \| good	0.221 \| good	4.137 \| good	0.079 \| good
2026-07-29T07:00:00.000Z	18 \| good	3.294 \| good	14.3 \| good	19.354 \| good	0.213 \| good	4.338 \| good	0.081 \| good
2026-07-29T08:00:00.000Z	18 \| good	2.823 \| good	11.817 \| good	18.751 \| good	0.201 \| good	3.984 \| good	0.08 \| good
2026-07-29T09:00:00.000Z	17 \| good	2.707 \| good	11.292 \| good	17.904 \| good	0.197 \| good	3.738 \| good	0.08 \| good
2026-07-29T10:00:00.000Z	16 \| good	2.334 \| good	9.452 \| good	17.308 \| good	0.196 \| good	3.586 \| good	0.079 \| good
2026-07-29T11:00:00.000Z	16 \| good	2.867 \| good	11.757 \| good	17.042 \| good	0.196 \| good	3.551 \| good	0.079 \| good
2026-07-29T12:00:00.000Z	16 \| good	2.543 \| good	10.724 \| good	14.469 \| good	0.197 \| good	3.549 \| good	0.079 \| good
2026-07-29T13:00:00.000Z	14 \| good	2.338 \| good	9.455 \| good	15.301 \| good	0.201 \| good	3.566 \| good	0.079 \| good
2026-07-29T14:00:00.000Z	16 \| good	2.61 \| good	11.018 \| good	15.72 \| good	0.197 \| good	2.558 \| good	0.077 \| good
2026-07-29T15:00:00.000Z	22 \| good	3.937 \| good	16.931 \| good	15.978 \| good	0.2 \| good	2.612 \| good	0.08 \| good
2026-07-29T16:00:00.000Z	22 \| good	4.135 \| good	18.155 \| good	16.113 \| good	0.216 \| good	2.981 \| good	0.088 \| good
2026-07-29T17:00:00.000Z	27 \| good	5.447 \| good	23.411 \| good	17.078 \| good	0.234 \| good	3.047 \| good	0.093 \| good
2026-07-29T18:00:00.000Z	27 \| good	5.45 \| good	23.517 \| good	19.293 \| good	0.253 \| good	2.901 \| good	0.095 \| good
2026-07-29T19:00:00.000Z	27 \| good	5.371 \| good	23.182 \| good	20.75 \| good	0.27 \| good	2.706 \| good	0.095 \| good
2026-07-29T20:00:00.000Z	27 \| good	4.594 \| good	20.15 \| good	20.347 \| good	0.285 \| good	2.447 \| good	0.094 \| good
2026-07-29T21:00:00.000Z	33 \| good	5.52 \| good	24.09 \| good	19.502 \| good	0.291 \| good	2.156 \| good	0.092 \| good
2026-07-29T22:00:00.000Z	27 \| good	5.414 \| good	23.722 \| good	19.037 \| good	0.289 \| good	1.945 \| good	0.09 \| good
2026-07-29T23:00:00.000Z	33 \| good	5.512 \| good	23.999 \| good	18.712 \| good	0.271 \| good	1.881 \| good	0.089 \| good
2026-07-30T00:00:00.000Z	33 \| good	6.098 \| good	26.774 \| good	19.9 \| good	0.259 \| good	1.962 \| good	0.089 \| good
2026-07-30T01:00:00.000Z	33 \| good	5.801 \| good	25.364 \| good	19.967 \| good	0.246 \| good	2.492 \| good	0.091 \| good
2026-07-30T02:00:00.000Z	27 \| good	5.232 \| good	22.362 \| good	19.817 \| good	0.241 \| good	3.521 \| good	0.095 \| good
2026-07-30T03:00:00.000Z	27 \| good	4.773 \| good	20.657 \| good	19.133 \| good	0.238 \| good	5.057 \| good	0.096 \| good
2026-07-30T04:00:00.000Z	27 \| good	4.516 \| good	19.619 \| good	19.49 \| good	0.246 \| good	5.904 \| good	0.096 \| good
2026-07-30T05:00:00.000Z	27 \| good	4.823 \| good	20.727 \| good	20.068 \| good	0.259 \| good	5.766 \| good	0.094 \| good
2026-07-30T06:00:00.000Z	52 \| moderate	9.597 \| good	14.787 \| good	19.728 \| good	0.259 \| good	5.641 \| good	0.093 \| 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?