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

Hillsborough, California currently has a PM10 concentration of 17.316 μg/m3.

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

The current sulfur dioxide (SO2) concentration in Hillsborough, California is 0.347 ppb.

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

Hillsborough, California currently has an ozone (O3) concentration of 24.245 ppm.

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

The current level of nitrogen dioxide (NO2) in Hillsborough, California is 1.823 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 4.234 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)

4.23 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

17.32 μg/m³

155

255

425

605+

Ozone (O₃)

24.25 ppb

201

201+

Sulfur Dioxide (SO₂)

0.35 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

1.82 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.25 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

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
2026-09-19T10:00:00.000Z	33 \| good	6.225 \| good	23.277 \| good	26.184 \| good	0.478 \| good	3.096 \| good	0.127 \| good
2026-09-19T11:00:00.000Z	25 \| good	3.513 \| good	23.328 \| good	26.921 \| good	0.462 \| good	2.981 \| good	0.127 \| good
2026-09-19T12:00:00.000Z	33 \| good	5.58 \| good	24.021 \| good	26.178 \| good	0.252 \| good	3.036 \| good	0.146 \| good
2026-09-19T13:00:00.000Z	38 \| good	7.308 \| good	27.248 \| good	29.157 \| good	0.303 \| good	1.636 \| good	0.235 \| good
2026-09-19T14:00:00.000Z	44 \| good	7.535 \| good	31.645 \| good	29.496 \| good	0.375 \| good	1.789 \| good	0.235 \| good
2026-09-19T15:00:00.000Z	33 \| good	6.291 \| good	26.148 \| good	27.108 \| good	0.263 \| good	2.068 \| good	0.251 \| good
2026-09-19T16:00:00.000Z	33 \| good	5.52 \| good	17.994 \| good	23.211 \| good	0.29 \| good	2.533 \| good	0.267 \| good
2026-09-19T17:00:00.000Z	38 \| good	7.227 \| good	31.723 \| good	21.328 \| good	0.333 \| good	4.235 \| good	0.267 \| good
2026-09-19T18:00:00.000Z	27 \| good	5.03 \| good	20.95 \| good	25.815 \| good	0.364 \| good	3.722 \| good	0.251 \| good
2026-09-19T19:00:00.000Z	27 \| good	5.292 \| good	25.145 \| good	26.771 \| good	0.338 \| good	3.199 \| good	0.251 \| good
2026-09-19T20:00:00.000Z	38 \| good	6.835 \| good	30.409 \| good	25.657 \| good	0.462 \| good	3.406 \| good	0.273 \| good
2026-09-19T21:00:00.000Z	33 \| good	6.264 \| good	25.955 \| good	25.989 \| good	0.405 \| good	2.918 \| good	0.289 \| good
2026-09-19T22:00:00.000Z	27 \| good	4.508 \| good	24.225 \| good	25.847 \| good	0.347 \| good	3.799 \| good	0.294 \| good
2026-09-19T23:00:00.000Z	33 \| good	5.593 \| good	21.536 \| good	27.345 \| good	0.307 \| good	3.372 \| good	0.284 \| good
2026-09-20T00:00:00.000Z	27 \| good	5.255 \| good	22.607 \| good	27.314 \| good	0.273 \| good	4.666 \| good	0.267 \| good
2026-09-20T01:00:00.000Z	27 \| good	5.335 \| good	28.779 \| good	26.439 \| good	0.29 \| good	3.184 \| good	0.267 \| good
2026-09-20T02:00:00.000Z	33 \| good	6.34 \| good	26.633 \| good	33.497 \| good	0.267 \| good	2.29 \| good	0.267 \| good
2026-09-20T03:00:00.000Z	33 \| good	6.419 \| good	28.978 \| good	29.517 \| good	0.277 \| good	4.538 \| good	0.13 \| good
2026-09-20T04:00:00.000Z	33 \| good	6.029 \| good	22.959 \| good	34.467 \| good	0.353 \| good	5.237 \| good	0.306 \| good
2026-09-20T05:00:00.000Z	38 \| good	6.996 \| good	27.377 \| good	32.328 \| good	0.364 \| good	3.322 \| good	0.251 \| good
2026-09-20T06:00:00.000Z	44 \| good	7.654 \| good	30.621 \| good	32.857 \| good	0.395 \| good	2.949 \| good	0.251 \| good
2026-09-20T07:00:00.000Z	44 \| good	7.758 \| good	24.79 \| good	28.217 \| good	0.301 \| good	2.991 \| good	0.267 \| good
2026-09-20T08:00:00.000Z	27 \| good	5.131 \| good	12.551 \| good	26.108 \| good	0.397 \| good	3.166 \| good	0.251 \| good
2026-09-20T09:00:00.000Z	33 \| good	6.353 \| good	29.669 \| good	26.599 \| good	0.42 \| good	2.247 \| good	0.251 \| good
2026-09-20T10:00:00.000Z	38 \| good	7.221 \| good	22.131 \| good	26.249 \| good	0.65 \| good	3.484 \| good	0.14 \| good
2026-09-20T11:00:00.000Z	44 \| good	7.515 \| good	30.555 \| good	27.463 \| good	0.56 \| good	3.339 \| good	0.14 \| good
2026-09-20T12:00:00.000Z	27 \| good	4.996 \| good	21.159 \| good	27.847 \| good	0.247 \| good	3.063 \| good	0.14 \| good
2026-09-20T13:00:00.000Z	28 \| good	4.162 \| good	13.773 \| good	29.852 \| good	0.325 \| good	1.153 \| good	0.235 \| good
2026-09-20T14:00:00.000Z	23 \| good	4.088 \| good	17.085 \| good	25.417 \| good	0.349 \| good	1.285 \| good	0.235 \| good
2026-09-20T15:00:00.000Z	27 \| good	4.545 \| good	21.476 \| good	25.624 \| good	0.323 \| good	1.457 \| good	0.251 \| good
2026-09-20T16:00:00.000Z	25 \| good	3.99 \| good	13.67 \| good	26.998 \| good	0.305 \| good	2.544 \| good	0.251 \| good
2026-09-20T17:00:00.000Z	27 \| good	5.094 \| good	24.139 \| good	25.884 \| good	0.351 \| good	2.651 \| good	0.251 \| good
2026-09-20T18:00:00.000Z	27 \| good	5.367 \| good	27.566 \| good	25.567 \| good	0.298 \| good	2.514 \| good	0.251 \| good
2026-09-20T19:00:00.000Z	33 \| good	5.738 \| good	28.871 \| good	24.978 \| good	0.449 \| good	2.42 \| good	0.251 \| good
2026-09-20T20:00:00.000Z	38 \| good	6.755 \| good	30.06 \| good	23.941 \| good	0.31 \| good	1.547 \| good	0.251 \| good
2026-09-20T21:00:00.000Z	27 \| good	5.37 \| good	22.887 \| good	24.889 \| good	0.425 \| good	1.73 \| good	0.251 \| good
2026-09-20T22:00:00.000Z	23 \| good	4.19 \| good	25.069 \| good	25.5 \| good	0.447 \| good	2.093 \| good	0.251 \| good
2026-09-20T23:00:00.000Z	24 \| good	4.05 \| good	25.018 \| good	26.04 \| good	0.459 \| good	1.861 \| good	0.251 \| good
2026-09-21T00:00:00.000Z	25 \| good	3.037 \| good	24.156 \| good	26.703 \| good	0.326 \| good	2.289 \| good	0.251 \| good
2026-09-21T01:00:00.000Z	25 \| good	3.058 \| good	17.216 \| good	26.97 \| good	0.403 \| good	2.097 \| good	0.251 \| good
2026-09-21T02:00:00.000Z	25 \| good	2.178 \| good	16.146 \| good	26.811 \| good	0.438 \| good	2.71 \| good	0.251 \| good
2026-09-21T03:00:00.000Z	28 \| good	4.995 \| good	21.109 \| good	29.699 \| good	0.27 \| good	3.756 \| good	0.144 \| good
2026-09-21T04:00:00.000Z	28 \| good	4.059 \| good	16.235 \| good	29.697 \| good	0.376 \| good	2.562 \| good	0.267 \| good
2026-09-21T05:00:00.000Z	26 \| good	4.488 \| good	19.392 \| good	27.728 \| good	0.306 \| good	2.586 \| good	0.251 \| good
2026-09-21T06:00:00.000Z	23 \| good	4.07 \| good	18.158 \| good	24.779 \| good	0.394 \| good	1.803 \| good	0.251 \| good
2026-09-21T07:00:00.000Z	23 \| good	4.152 \| good	18.217 \| good	25.382 \| good	0.347 \| good	1.968 \| good	0.251 \| good
2026-09-21T08:00:00.000Z	23 \| good	4.293 \| good	18.295 \| good	24.875 \| good	0.34 \| good	1.828 \| good	0.251 \| good
2026-09-21T09:00:00.000Z	27 \| good	5.342 \| good	21.941 \| good	25.159 \| good	0.331 \| good	1.309 \| good	0.235 \| good
2026-09-21T09:00:00.000Z	22 \| good	4.234 \| good	17.316 \| good	24.245 \| good	0.347 \| good	1.823 \| good	0.248 \| good
2026-09-21T10:00:00.000Z	29 \| good	4.139 \| good	18.116 \| good	31.126 \| good	0.306 \| good	2.316 \| good	0.138 \| good
2026-09-21T11:00:00.000Z	30 \| good	4.589 \| good	20.086 \| good	31.519 \| good	0.302 \| good	2.256 \| good	0.138 \| good
2026-09-21T12:00:00.000Z	28 \| good	5.251 \| good	22.893 \| good	29.619 \| good	0.302 \| good	2.253 \| good	0.138 \| good
2026-09-21T13:00:00.000Z	29 \| good	5.096 \| good	22.073 \| good	31.26 \| good	0.305 \| good	2.202 \| good	0.138 \| good
2026-09-21T14:00:00.000Z	28 \| good	4.775 \| good	20.917 \| good	30.426 \| good	0.309 \| good	2.222 \| good	0.137 \| good
2026-09-21T15:00:00.000Z	27 \| good	5.43 \| good	23.101 \| good	29.288 \| good	0.317 \| good	2.19 \| good	0.136 \| good
2026-09-21T16:00:00.000Z	38 \| good	6.815 \| good	30.044 \| good	30.573 \| good	0.311 \| good	1.943 \| good	0.135 \| good
2026-09-21T17:00:00.000Z	38 \| good	6.607 \| good	29.773 \| good	30.913 \| good	0.31 \| good	1.746 \| good	0.134 \| good
2026-09-21T18:00:00.000Z	33 \| good	5.968 \| good	26.631 \| good	30.972 \| good	0.315 \| good	1.831 \| good	0.133 \| good
2026-09-21T19:00:00.000Z	33 \| good	5.77 \| good	24.97 \| good	29.832 \| good	0.314 \| good	1.596 \| good	0.131 \| good
2026-09-21T20:00:00.000Z	33 \| good	5.983 \| good	26.83 \| good	27.907 \| good	0.305 \| good	1.544 \| good	0.129 \| good
2026-09-21T21:00:00.000Z	38 \| good	6.834 \| good	30 \| good	27.953 \| good	0.297 \| good	1.559 \| good	0.127 \| good
2026-09-21T22:00:00.000Z	38 \| good	6.536 \| good	29.034 \| good	28.946 \| good	0.294 \| good	1.526 \| good	0.125 \| good
2026-09-21T23:00:00.000Z	33 \| good	6.118 \| good	26.994 \| good	29.438 \| good	0.294 \| good	1.549 \| good	0.123 \| good
2026-09-22T00:00:00.000Z	33 \| good	6.345 \| good	28.043 \| good	30.39 \| good	0.289 \| good	1.777 \| good	0.121 \| good
2026-09-22T01:00:00.000Z	33 \| good	5.758 \| good	24.929 \| good	30.705 \| good	0.296 \| good	2.316 \| good	0.122 \| good
2026-09-22T02:00:00.000Z	27 \| good	5.402 \| good	23.036 \| good	28.594 \| good	0.31 \| good	2.8 \| good	0.122 \| good
2026-09-22T03:00:00.000Z	27 \| good	4.693 \| good	20.813 \| good	29.364 \| good	0.332 \| good	2.968 \| good	0.123 \| good
2026-09-22T04:00:00.000Z	27 \| good	4.375 \| good	19.036 \| good	29.23 \| good	0.341 \| good	2.913 \| good	0.122 \| good
2026-09-22T05:00:00.000Z	28 \| good	4.215 \| good	18.877 \| good	29.971 \| good	0.338 \| good	2.557 \| good	0.12 \| good
2026-09-22T06:00:00.000Z	28 \| good	4.861 \| good	21.072 \| good	29.901 \| good	0.34 \| good	2.483 \| good	0.119 \| good
2026-09-22T07:00:00.000Z	27 \| good	3.969 \| good	17.131 \| good	29.249 \| good	0.338 \| good	2.53 \| good	0.119 \| good
2026-09-22T08:00:00.000Z	27 \| good	4.61 \| good	20.127 \| good	28.22 \| good	0.336 \| good	2.6 \| good	0.119 \| good
2026-09-22T09:00:00.000Z	27 \| good	5.426 \| good	23.392 \| good	27.502 \| good	0.325 \| good	2.78 \| good	0.119 \| good
2026-09-22T10:00:00.000Z	27 \| good	4.912 \| good	21.17 \| good	27.22 \| good	0.315 \| good	2.7 \| good	0.118 \| good
2026-09-22T11:00:00.000Z	27 \| good	4.723 \| good	20.245 \| good	26.949 \| good	0.301 \| good	2.811 \| good	0.117 \| good
2026-09-22T12:00:00.000Z	24 \| good	3.285 \| good	14.214 \| good	26.347 \| good	0.296 \| good	2.967 \| good	0.116 \| good
2026-09-22T13:00:00.000Z	27 \| good	4.897 \| good	21.175 \| good	26.751 \| good	0.297 \| good	3.31 \| good	0.116 \| good
2026-09-22T14:00:00.000Z	23 \| good	4.194 \| good	18.175 \| good	24.837 \| good	0.303 \| good	3.842 \| good	0.119 \| good
2026-09-22T15:00:00.000Z	27 \| good	4.523 \| good	20.051 \| good	23.357 \| good	0.322 \| good	4.299 \| good	0.124 \| good
2026-09-22T16:00:00.000Z	27 \| good	5.259 \| good	22.92 \| good	24.825 \| good	0.363 \| good	3.047 \| good	0.117 \| good
2026-09-22T17:00:00.000Z	33 \| good	5.834 \| good	25.075 \| good	26.894 \| good	0.368 \| good	2.49 \| good	0.117 \| good
2026-09-22T18:00:00.000Z	27 \| good	4.963 \| good	21.045 \| good	28.81 \| good	0.382 \| good	2.221 \| good	0.116 \| good
2026-09-22T19:00:00.000Z	33 \| good	5.691 \| good	24.927 \| good	29.125 \| good	0.397 \| good	1.918 \| good	0.116 \| good
2026-09-22T20:00:00.000Z	27 \| good	4.919 \| good	21.087 \| good	27.465 \| good	0.392 \| good	1.842 \| good	0.116 \| good
2026-09-22T21:00:00.000Z	33 \| good	5.829 \| good	25.185 \| good	27.197 \| good	0.379 \| good	1.877 \| good	0.116 \| good
2026-09-22T22:00:00.000Z	33 \| good	5.754 \| good	24.948 \| good	27.876 \| good	0.366 \| good	2.12 \| good	0.116 \| good
2026-09-22T23:00:00.000Z	33 \| good	6.171 \| good	27.045 \| good	29.11 \| good	0.373 \| good	2.024 \| good	0.115 \| good
2026-09-23T00:00:00.000Z	33 \| good	5.87 \| good	25.041 \| good	30.883 \| good	0.345 \| good	2.233 \| good	0.115 \| good
2026-09-23T01:00:00.000Z	29 \| good	4.99 \| good	21.818 \| good	30.878 \| good	0.32 \| good	2.735 \| good	0.116 \| good
2026-09-23T02:00:00.000Z	27 \| good	4.653 \| good	20.072 \| good	28.081 \| good	0.308 \| good	4.585 \| good	0.123 \| good
2026-09-23T03:00:00.000Z	33 \| good	5.806 \| good	25.294 \| good	29.887 \| good	0.332 \| good	6.716 \| good	0.13 \| good
2026-09-23T04:00:00.000Z	38 \| good	6.778 \| good	30.15 \| good	28.423 \| good	0.356 \| good	6.983 \| good	0.13 \| good
2026-09-23T05:00:00.000Z	38 \| good	6.612 \| good	29.211 \| good	27.785 \| good	0.355 \| good	7.942 \| good	0.133 \| good
2026-09-23T06:00:00.000Z	33 \| good	5.939 \| good	26.892 \| good	27.633 \| good	0.356 \| good	8.997 \| good	0.138 \| good
2026-09-23T07:00:00.000Z	27 \| good	5.3 \| good	23.092 \| good	28.141 \| good	0.35 \| good	9.186 \| good	0.141 \| good
2026-09-23T08:00:00.000Z	27 \| good	5.23 \| good	22.339 \| good	26.933 \| good	0.343 \| good	8.053 \| good	0.14 \| good
2026-09-23T09:00:00.000Z	33 \| good	5.563 \| good	24.197 \| good	24.98 \| good	0.334 \| good	7.17 \| good	0.14 \| good

Hillsborough

Empower business decisions with accurate air quality data

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

0.21ppm

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

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 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 11:00:00, 2026-09-20.

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

The best air quality in Hillsborough, California was observed at 08:00:00 on 2026-09-21.

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

The air quality in Hillsborough, California right now is Good, with an AQI of 22.

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 4.234 μg/m³.

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

Hillsborough, California currently has a PM₁₀ concentration of 17.316 μg/m³.

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

The current carbon monoxide (CO) level in Hillsborough, California is 0.248 ppm.

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

The current sulfur dioxide (SO₂) concentration in Hillsborough, California is 0.347 ppb.

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

Hillsborough, California currently has an ozone (O₃) concentration of 24.245 ppm.

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

The current level of nitrogen dioxide (NO₂) in Hillsborough, California is 1.823 ppb.

Certified

APIs

Refund Policy

Historical Climate Data

Terms & Conditions

Refund Policy

Terms & Conditions

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-09-19T10:00:00.000Z	33 \| good	6.225 \| good	23.277 \| good	26.184 \| good	0.478 \| good	3.096 \| good	0.127 \| good
2026-09-19T11:00:00.000Z	25 \| good	3.513 \| good	23.328 \| good	26.921 \| good	0.462 \| good	2.981 \| good	0.127 \| good
2026-09-19T12:00:00.000Z	33 \| good	5.58 \| good	24.021 \| good	26.178 \| good	0.252 \| good	3.036 \| good	0.146 \| good
2026-09-19T13:00:00.000Z	38 \| good	7.308 \| good	27.248 \| good	29.157 \| good	0.303 \| good	1.636 \| good	0.235 \| good
2026-09-19T14:00:00.000Z	44 \| good	7.535 \| good	31.645 \| good	29.496 \| good	0.375 \| good	1.789 \| good	0.235 \| good
2026-09-19T15:00:00.000Z	33 \| good	6.291 \| good	26.148 \| good	27.108 \| good	0.263 \| good	2.068 \| good	0.251 \| good
2026-09-19T16:00:00.000Z	33 \| good	5.52 \| good	17.994 \| good	23.211 \| good	0.29 \| good	2.533 \| good	0.267 \| good
2026-09-19T17:00:00.000Z	38 \| good	7.227 \| good	31.723 \| good	21.328 \| good	0.333 \| good	4.235 \| good	0.267 \| good
2026-09-19T18:00:00.000Z	27 \| good	5.03 \| good	20.95 \| good	25.815 \| good	0.364 \| good	3.722 \| good	0.251 \| good
2026-09-19T19:00:00.000Z	27 \| good	5.292 \| good	25.145 \| good	26.771 \| good	0.338 \| good	3.199 \| good	0.251 \| good
2026-09-19T20:00:00.000Z	38 \| good	6.835 \| good	30.409 \| good	25.657 \| good	0.462 \| good	3.406 \| good	0.273 \| good
2026-09-19T21:00:00.000Z	33 \| good	6.264 \| good	25.955 \| good	25.989 \| good	0.405 \| good	2.918 \| good	0.289 \| good
2026-09-19T22:00:00.000Z	27 \| good	4.508 \| good	24.225 \| good	25.847 \| good	0.347 \| good	3.799 \| good	0.294 \| good
2026-09-19T23:00:00.000Z	33 \| good	5.593 \| good	21.536 \| good	27.345 \| good	0.307 \| good	3.372 \| good	0.284 \| good
2026-09-20T00:00:00.000Z	27 \| good	5.255 \| good	22.607 \| good	27.314 \| good	0.273 \| good	4.666 \| good	0.267 \| good
2026-09-20T01:00:00.000Z	27 \| good	5.335 \| good	28.779 \| good	26.439 \| good	0.29 \| good	3.184 \| good	0.267 \| good
2026-09-20T02:00:00.000Z	33 \| good	6.34 \| good	26.633 \| good	33.497 \| good	0.267 \| good	2.29 \| good	0.267 \| good
2026-09-20T03:00:00.000Z	33 \| good	6.419 \| good	28.978 \| good	29.517 \| good	0.277 \| good	4.538 \| good	0.13 \| good
2026-09-20T04:00:00.000Z	33 \| good	6.029 \| good	22.959 \| good	34.467 \| good	0.353 \| good	5.237 \| good	0.306 \| good
2026-09-20T05:00:00.000Z	38 \| good	6.996 \| good	27.377 \| good	32.328 \| good	0.364 \| good	3.322 \| good	0.251 \| good
2026-09-20T06:00:00.000Z	44 \| good	7.654 \| good	30.621 \| good	32.857 \| good	0.395 \| good	2.949 \| good	0.251 \| good
2026-09-20T07:00:00.000Z	44 \| good	7.758 \| good	24.79 \| good	28.217 \| good	0.301 \| good	2.991 \| good	0.267 \| good
2026-09-20T08:00:00.000Z	27 \| good	5.131 \| good	12.551 \| good	26.108 \| good	0.397 \| good	3.166 \| good	0.251 \| good
2026-09-20T09:00:00.000Z	33 \| good	6.353 \| good	29.669 \| good	26.599 \| good	0.42 \| good	2.247 \| good	0.251 \| good
2026-09-20T10:00:00.000Z	38 \| good	7.221 \| good	22.131 \| good	26.249 \| good	0.65 \| good	3.484 \| good	0.14 \| good
2026-09-20T11:00:00.000Z	44 \| good	7.515 \| good	30.555 \| good	27.463 \| good	0.56 \| good	3.339 \| good	0.14 \| good
2026-09-20T12:00:00.000Z	27 \| good	4.996 \| good	21.159 \| good	27.847 \| good	0.247 \| good	3.063 \| good	0.14 \| good
2026-09-20T13:00:00.000Z	28 \| good	4.162 \| good	13.773 \| good	29.852 \| good	0.325 \| good	1.153 \| good	0.235 \| good
2026-09-20T14:00:00.000Z	23 \| good	4.088 \| good	17.085 \| good	25.417 \| good	0.349 \| good	1.285 \| good	0.235 \| good
2026-09-20T15:00:00.000Z	27 \| good	4.545 \| good	21.476 \| good	25.624 \| good	0.323 \| good	1.457 \| good	0.251 \| good
2026-09-20T16:00:00.000Z	25 \| good	3.99 \| good	13.67 \| good	26.998 \| good	0.305 \| good	2.544 \| good	0.251 \| good
2026-09-20T17:00:00.000Z	27 \| good	5.094 \| good	24.139 \| good	25.884 \| good	0.351 \| good	2.651 \| good	0.251 \| good
2026-09-20T18:00:00.000Z	27 \| good	5.367 \| good	27.566 \| good	25.567 \| good	0.298 \| good	2.514 \| good	0.251 \| good
2026-09-20T19:00:00.000Z	33 \| good	5.738 \| good	28.871 \| good	24.978 \| good	0.449 \| good	2.42 \| good	0.251 \| good
2026-09-20T20:00:00.000Z	38 \| good	6.755 \| good	30.06 \| good	23.941 \| good	0.31 \| good	1.547 \| good	0.251 \| good
2026-09-20T21:00:00.000Z	27 \| good	5.37 \| good	22.887 \| good	24.889 \| good	0.425 \| good	1.73 \| good	0.251 \| good
2026-09-20T22:00:00.000Z	23 \| good	4.19 \| good	25.069 \| good	25.5 \| good	0.447 \| good	2.093 \| good	0.251 \| good
2026-09-20T23:00:00.000Z	24 \| good	4.05 \| good	25.018 \| good	26.04 \| good	0.459 \| good	1.861 \| good	0.251 \| good
2026-09-21T00:00:00.000Z	25 \| good	3.037 \| good	24.156 \| good	26.703 \| good	0.326 \| good	2.289 \| good	0.251 \| good
2026-09-21T01:00:00.000Z	25 \| good	3.058 \| good	17.216 \| good	26.97 \| good	0.403 \| good	2.097 \| good	0.251 \| good
2026-09-21T02:00:00.000Z	25 \| good	2.178 \| good	16.146 \| good	26.811 \| good	0.438 \| good	2.71 \| good	0.251 \| good
2026-09-21T03:00:00.000Z	28 \| good	4.995 \| good	21.109 \| good	29.699 \| good	0.27 \| good	3.756 \| good	0.144 \| good
2026-09-21T04:00:00.000Z	28 \| good	4.059 \| good	16.235 \| good	29.697 \| good	0.376 \| good	2.562 \| good	0.267 \| good
2026-09-21T05:00:00.000Z	26 \| good	4.488 \| good	19.392 \| good	27.728 \| good	0.306 \| good	2.586 \| good	0.251 \| good
2026-09-21T06:00:00.000Z	23 \| good	4.07 \| good	18.158 \| good	24.779 \| good	0.394 \| good	1.803 \| good	0.251 \| good
2026-09-21T07:00:00.000Z	23 \| good	4.152 \| good	18.217 \| good	25.382 \| good	0.347 \| good	1.968 \| good	0.251 \| good
2026-09-21T08:00:00.000Z	23 \| good	4.293 \| good	18.295 \| good	24.875 \| good	0.34 \| good	1.828 \| good	0.251 \| good
2026-09-21T09:00:00.000Z	27 \| good	5.342 \| good	21.941 \| good	25.159 \| good	0.331 \| good	1.309 \| good	0.235 \| good
2026-09-21T09:00:00.000Z	22 \| good	4.234 \| good	17.316 \| good	24.245 \| good	0.347 \| good	1.823 \| good	0.248 \| good
2026-09-21T10:00:00.000Z	29 \| good	4.139 \| good	18.116 \| good	31.126 \| good	0.306 \| good	2.316 \| good	0.138 \| good
2026-09-21T11:00:00.000Z	30 \| good	4.589 \| good	20.086 \| good	31.519 \| good	0.302 \| good	2.256 \| good	0.138 \| good
2026-09-21T12:00:00.000Z	28 \| good	5.251 \| good	22.893 \| good	29.619 \| good	0.302 \| good	2.253 \| good	0.138 \| good
2026-09-21T13:00:00.000Z	29 \| good	5.096 \| good	22.073 \| good	31.26 \| good	0.305 \| good	2.202 \| good	0.138 \| good
2026-09-21T14:00:00.000Z	28 \| good	4.775 \| good	20.917 \| good	30.426 \| good	0.309 \| good	2.222 \| good	0.137 \| good
2026-09-21T15:00:00.000Z	27 \| good	5.43 \| good	23.101 \| good	29.288 \| good	0.317 \| good	2.19 \| good	0.136 \| good
2026-09-21T16:00:00.000Z	38 \| good	6.815 \| good	30.044 \| good	30.573 \| good	0.311 \| good	1.943 \| good	0.135 \| good
2026-09-21T17:00:00.000Z	38 \| good	6.607 \| good	29.773 \| good	30.913 \| good	0.31 \| good	1.746 \| good	0.134 \| good
2026-09-21T18:00:00.000Z	33 \| good	5.968 \| good	26.631 \| good	30.972 \| good	0.315 \| good	1.831 \| good	0.133 \| good
2026-09-21T19:00:00.000Z	33 \| good	5.77 \| good	24.97 \| good	29.832 \| good	0.314 \| good	1.596 \| good	0.131 \| good
2026-09-21T20:00:00.000Z	33 \| good	5.983 \| good	26.83 \| good	27.907 \| good	0.305 \| good	1.544 \| good	0.129 \| good
2026-09-21T21:00:00.000Z	38 \| good	6.834 \| good	30 \| good	27.953 \| good	0.297 \| good	1.559 \| good	0.127 \| good
2026-09-21T22:00:00.000Z	38 \| good	6.536 \| good	29.034 \| good	28.946 \| good	0.294 \| good	1.526 \| good	0.125 \| good
2026-09-21T23:00:00.000Z	33 \| good	6.118 \| good	26.994 \| good	29.438 \| good	0.294 \| good	1.549 \| good	0.123 \| good
2026-09-22T00:00:00.000Z	33 \| good	6.345 \| good	28.043 \| good	30.39 \| good	0.289 \| good	1.777 \| good	0.121 \| good
2026-09-22T01:00:00.000Z	33 \| good	5.758 \| good	24.929 \| good	30.705 \| good	0.296 \| good	2.316 \| good	0.122 \| good
2026-09-22T02:00:00.000Z	27 \| good	5.402 \| good	23.036 \| good	28.594 \| good	0.31 \| good	2.8 \| good	0.122 \| good
2026-09-22T03:00:00.000Z	27 \| good	4.693 \| good	20.813 \| good	29.364 \| good	0.332 \| good	2.968 \| good	0.123 \| good
2026-09-22T04:00:00.000Z	27 \| good	4.375 \| good	19.036 \| good	29.23 \| good	0.341 \| good	2.913 \| good	0.122 \| good
2026-09-22T05:00:00.000Z	28 \| good	4.215 \| good	18.877 \| good	29.971 \| good	0.338 \| good	2.557 \| good	0.12 \| good
2026-09-22T06:00:00.000Z	28 \| good	4.861 \| good	21.072 \| good	29.901 \| good	0.34 \| good	2.483 \| good	0.119 \| good
2026-09-22T07:00:00.000Z	27 \| good	3.969 \| good	17.131 \| good	29.249 \| good	0.338 \| good	2.53 \| good	0.119 \| good
2026-09-22T08:00:00.000Z	27 \| good	4.61 \| good	20.127 \| good	28.22 \| good	0.336 \| good	2.6 \| good	0.119 \| good
2026-09-22T09:00:00.000Z	27 \| good	5.426 \| good	23.392 \| good	27.502 \| good	0.325 \| good	2.78 \| good	0.119 \| good
2026-09-22T10:00:00.000Z	27 \| good	4.912 \| good	21.17 \| good	27.22 \| good	0.315 \| good	2.7 \| good	0.118 \| good
2026-09-22T11:00:00.000Z	27 \| good	4.723 \| good	20.245 \| good	26.949 \| good	0.301 \| good	2.811 \| good	0.117 \| good
2026-09-22T12:00:00.000Z	24 \| good	3.285 \| good	14.214 \| good	26.347 \| good	0.296 \| good	2.967 \| good	0.116 \| good
2026-09-22T13:00:00.000Z	27 \| good	4.897 \| good	21.175 \| good	26.751 \| good	0.297 \| good	3.31 \| good	0.116 \| good
2026-09-22T14:00:00.000Z	23 \| good	4.194 \| good	18.175 \| good	24.837 \| good	0.303 \| good	3.842 \| good	0.119 \| good
2026-09-22T15:00:00.000Z	27 \| good	4.523 \| good	20.051 \| good	23.357 \| good	0.322 \| good	4.299 \| good	0.124 \| good
2026-09-22T16:00:00.000Z	27 \| good	5.259 \| good	22.92 \| good	24.825 \| good	0.363 \| good	3.047 \| good	0.117 \| good
2026-09-22T17:00:00.000Z	33 \| good	5.834 \| good	25.075 \| good	26.894 \| good	0.368 \| good	2.49 \| good	0.117 \| good
2026-09-22T18:00:00.000Z	27 \| good	4.963 \| good	21.045 \| good	28.81 \| good	0.382 \| good	2.221 \| good	0.116 \| good
2026-09-22T19:00:00.000Z	33 \| good	5.691 \| good	24.927 \| good	29.125 \| good	0.397 \| good	1.918 \| good	0.116 \| good
2026-09-22T20:00:00.000Z	27 \| good	4.919 \| good	21.087 \| good	27.465 \| good	0.392 \| good	1.842 \| good	0.116 \| good
2026-09-22T21:00:00.000Z	33 \| good	5.829 \| good	25.185 \| good	27.197 \| good	0.379 \| good	1.877 \| good	0.116 \| good
2026-09-22T22:00:00.000Z	33 \| good	5.754 \| good	24.948 \| good	27.876 \| good	0.366 \| good	2.12 \| good	0.116 \| good
2026-09-22T23:00:00.000Z	33 \| good	6.171 \| good	27.045 \| good	29.11 \| good	0.373 \| good	2.024 \| good	0.115 \| good
2026-09-23T00:00:00.000Z	33 \| good	5.87 \| good	25.041 \| good	30.883 \| good	0.345 \| good	2.233 \| good	0.115 \| good
2026-09-23T01:00:00.000Z	29 \| good	4.99 \| good	21.818 \| good	30.878 \| good	0.32 \| good	2.735 \| good	0.116 \| good
2026-09-23T02:00:00.000Z	27 \| good	4.653 \| good	20.072 \| good	28.081 \| good	0.308 \| good	4.585 \| good	0.123 \| good
2026-09-23T03:00:00.000Z	33 \| good	5.806 \| good	25.294 \| good	29.887 \| good	0.332 \| good	6.716 \| good	0.13 \| good
2026-09-23T04:00:00.000Z	38 \| good	6.778 \| good	30.15 \| good	28.423 \| good	0.356 \| good	6.983 \| good	0.13 \| good
2026-09-23T05:00:00.000Z	38 \| good	6.612 \| good	29.211 \| good	27.785 \| good	0.355 \| good	7.942 \| good	0.133 \| good
2026-09-23T06:00:00.000Z	33 \| good	5.939 \| good	26.892 \| good	27.633 \| good	0.356 \| good	8.997 \| good	0.138 \| good
2026-09-23T07:00:00.000Z	27 \| good	5.3 \| good	23.092 \| good	28.141 \| good	0.35 \| good	9.186 \| good	0.141 \| good
2026-09-23T08:00:00.000Z	27 \| good	5.23 \| good	22.339 \| good	26.933 \| good	0.343 \| good	8.053 \| good	0.14 \| good
2026-09-23T09:00:00.000Z	33 \| good	5.563 \| good	24.197 \| good	24.98 \| good	0.334 \| good	7.17 \| good	0.14 \| 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?