What is the current level of PM10 in Half Moon Bay, California?

Half Moon Bay, California currently has a PM10 concentration of 8.972 μg/m3.

What is the current level of sulfur dioxide (SO2) in Half Moon Bay, California?

The current sulfur dioxide (SO2) concentration in Half Moon Bay, California is 0.467 ppb.

What is the current level of ozone (O3) in Half Moon Bay, California?

Half Moon Bay, California currently has an ozone (O3) concentration of 40.286 ppm.

What is the current level of nitrogen dioxide (NO2) in Half Moon Bay, California?

The current level of nitrogen dioxide (NO2) in Half Moon Bay, California is 5.969 ppb.

Current air quality index in Half Moon Bay, California today

Q: What is the PM2.5 concentration in Half Moon Bay, California right now?

Half Moon Bay, California currently has a PM2.5 concentration of 2.246 μg/m3.

Stay updated with real-time air quality in Half Moon Bay, 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

Half Moon Bay, California

Last updated: ... (Local time)

Common air pollutants in Half Moon Bay, California

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

2.25 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

8.97 μg/m³

155

255

425

605+

Ozone (O₃)

40.29 ppb

201

201+

Sulfur Dioxide (SO₂)

0.47 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

5.97 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.17 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

High

Half Moon Bay, California

Get Live Pollen Counts

Half Moon Bay, California

Scroll To Air Quality Map

Track live Half Moon Bay, California air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-04-15T05:00:00.000Z	34 \| good	4.091 \| good	17.628 \| good	37.007 \| good	0.265 \| good	3.179 \| good	0.314 \| good
2026-04-15T06:00:00.000Z	36 \| good	3.364 \| good	19.126 \| good	39.429 \| good	0.249 \| good	3.095 \| good	0.314 \| good
2026-04-15T07:00:00.000Z	33 \| good	2.842 \| good	16.257 \| good	36.491 \| good	0.393 \| good	3.04 \| good	0.314 \| good
2026-04-15T08:00:00.000Z	33 \| good	3.015 \| good	12.595 \| good	35.951 \| good	0.249 \| good	3.679 \| good	0.312 \| good
2026-04-15T09:00:00.000Z	29 \| good	3.534 \| good	15.055 \| good	30.8 \| good	0.233 \| good	4.424 \| good	0.293 \| good
2026-04-15T10:00:00.000Z	28 \| good	3.755 \| good	17.691 \| good	30.309 \| good	0.249 \| good	4.394 \| good	0.311 \| good
2026-04-15T11:00:00.000Z	28 \| good	3.841 \| good	13.356 \| good	30.185 \| good	0.434 \| good	3.947 \| good	0.311 \| good
2026-04-15T12:00:00.000Z	20 \| good	2.769 \| good	12.816 \| good	21.626 \| good	0.49 \| good	4.049 \| good	0.311 \| good
2026-04-15T13:00:00.000Z	27 \| good	3.732 \| good	13.16 \| good	28.799 \| good	0.651 \| good	4.054 \| good	0.293 \| good
2026-04-15T14:00:00.000Z	27 \| good	5.365 \| good	19.062 \| good	26.71 \| good	0.369 \| good	14.209 \| good	0.452 \| good
2026-04-15T15:00:00.000Z	29 \| good	5.439 \| good	22.341 \| good	31.293 \| good	0.585 \| good	12.675 \| good	0.477 \| good
2026-04-15T16:00:00.000Z	29 \| good	3.763 \| good	9.983 \| good	30.956 \| good	0.546 \| good	8.524 \| good	0.431 \| good
2026-04-15T17:00:00.000Z	30 \| good	3.086 \| good	9.35 \| good	31.686 \| good	0.414 \| good	7.074 \| good	0.375 \| good
2026-04-15T18:00:00.000Z	27 \| good	4.221 \| good	13.274 \| good	28.603 \| good	0.375 \| good	6.243 \| good	0.356 \| good
2026-04-15T19:00:00.000Z	26 \| good	3.219 \| good	15.012 \| good	28.189 \| good	0.678 \| good	5.646 \| good	0.314 \| good
2026-04-15T20:00:00.000Z	30 \| good	4.062 \| good	19.233 \| good	31.941 \| good	0.358 \| good	4.922 \| good	0.352 \| good
2026-04-15T21:00:00.000Z	31 \| good	4.378 \| good	16.112 \| good	33.746 \| good	0.313 \| good	4.826 \| good	0.356 \| good
2026-04-15T22:00:00.000Z	33 \| good	2.541 \| good	10.769 \| good	36.133 \| good	0.398 \| good	4.665 \| good	0.328 \| good
2026-04-15T23:00:00.000Z	34 \| good	3.191 \| good	8.717 \| good	36.577 \| good	0.411 \| good	4.764 \| good	0.345 \| good
2026-04-16T00:00:00.000Z	34 \| good	3.76 \| good	10.562 \| good	36.873 \| good	0.341 \| good	4.456 \| good	0.345 \| good
2026-04-16T01:00:00.000Z	35 \| good	2.222 \| good	9.586 \| good	37.871 \| good	0.388 \| good	3.672 \| good	0.328 \| good
2026-04-16T02:00:00.000Z	37 \| good	2.278 \| good	18.289 \| good	40.297 \| good	0.42 \| good	3.832 \| good	0.328 \| good
2026-04-16T03:00:00.000Z	36 \| good	2.642 \| good	13.22 \| good	38.901 \| good	0.491 \| good	4.278 \| good	0.328 \| good
2026-04-16T04:00:00.000Z	39 \| good	3.354 \| good	14.506 \| good	41.578 \| good	0.482 \| good	3.917 \| good	0.345 \| good
2026-04-16T05:00:00.000Z	33 \| good	3.267 \| good	14.196 \| good	35.716 \| good	0.28 \| good	3.698 \| good	0.345 \| good
2026-04-16T06:00:00.000Z	31 \| good	3.906 \| good	16.719 \| good	33.76 \| good	0.424 \| good	3.687 \| good	0.345 \| good
2026-04-16T07:00:00.000Z	31 \| good	2.366 \| good	10.933 \| good	33.795 \| good	0.383 \| good	3.186 \| good	0.345 \| good
2026-04-16T08:00:00.000Z	31 \| good	2.794 \| good	9.236 \| good	34.155 \| good	0.44 \| good	2.285 \| good	0.328 \| good
2026-04-16T09:00:00.000Z	31 \| good	2.066 \| good	12.109 \| good	33.949 \| good	0.481 \| good	1.39 \| good	0.294 \| good
2026-04-16T10:00:00.000Z	34 \| good	2.211 \| good	8.754 \| good	36.53 \| good	0.377 \| good	1.843 \| good	0.294 \| good
2026-04-16T11:00:00.000Z	31 \| good	2.947 \| good	10.95 \| good	32.849 \| good	0.414 \| good	2.799 \| good	0.294 \| good
2026-04-16T12:00:00.000Z	33 \| good	1.999 \| good	11.533 \| good	36.468 \| good	0.414 \| good	2.799 \| good	0.294 \| good
2026-04-16T13:00:00.000Z	32 \| good	2.8 \| good	9.039 \| good	34.973 \| good	0.414 \| good	2.798 \| good	0.294 \| good
2026-04-16T14:00:00.000Z	27 \| good	1.929 \| good	8.119 \| good	29.038 \| good	0.251 \| good	8.457 \| good	0.391 \| good
2026-04-16T15:00:00.000Z	28 \| good	2.439 \| good	3.935 \| good	29.865 \| good	0.28 \| good	6.573 \| good	0.402 \| good
2026-04-16T16:00:00.000Z	22 \| good	2.35 \| good	7.807 \| good	24.036 \| good	0.301 \| good	4.104 \| good	0.377 \| good
2026-04-16T17:00:00.000Z	27 \| good	3.32 \| good	12.47 \| good	29.008 \| good	0.299 \| good	5.547 \| good	0.345 \| good
2026-04-16T18:00:00.000Z	32 \| good	2.298 \| good	12.071 \| good	35 \| good	0.492 \| good	3.926 \| good	0.227 \| good
2026-04-16T19:00:00.000Z	32 \| good	3.092 \| good	10.541 \| good	35.429 \| good	0.29 \| good	4.263 \| good	0.294 \| good
2026-04-16T20:00:00.000Z	33 \| good	3.009 \| good	17.159 \| good	36.369 \| good	0.444 \| good	3.589 \| good	0.294 \| good
2026-04-16T21:00:00.000Z	36 \| good	2.887 \| good	16.708 \| good	39.108 \| good	0.338 \| good	2.862 \| good	0.227 \| good
2026-04-16T22:00:00.000Z	40 \| good	2.738 \| good	14.021 \| good	43.474 \| good	0.42 \| good	3.536 \| good	0.245 \| good
2026-04-16T23:00:00.000Z	43 \| good	2.377 \| good	12.249 \| good	45.57 \| good	0.407 \| good	5.175 \| good	0.245 \| good
2026-04-17T00:00:00.000Z	40 \| good	2.742 \| good	21.639 \| good	42.739 \| good	0.424 \| good	5.283 \| good	0.245 \| good
2026-04-17T01:00:00.000Z	39 \| good	2.154 \| good	8.737 \| good	42.016 \| good	0.403 \| good	4.975 \| good	0.283 \| good
2026-04-17T02:00:00.000Z	45 \| good	1.168 \| good	9.952 \| good	48.955 \| good	0.431 \| good	3.599 \| good	0.265 \| good
2026-04-17T03:00:00.000Z	37 \| good	2.246 \| good	8.972 \| good	40.286 \| good	0.467 \| good	5.969 \| good	0.169 \| good
2026-04-17T04:00:00.000Z	37 \| good	2.246 \| good	8.972 \| good	40.286 \| good	0.467 \| good	5.969 \| good	0.169 \| good
2026-04-17T05:00:00.000Z	32 \| good	1.818 \| good	7.695 \| good	35.488 \| good	0.561 \| good	7.01 \| good	0.173 \| good
2026-04-17T06:00:00.000Z	31 \| good	2.523 \| good	10.097 \| good	33.125 \| good	0.611 \| good	7.393 \| good	0.174 \| good
2026-04-17T07:00:00.000Z	28 \| good	3.349 \| good	14.778 \| good	30.217 \| good	0.605 \| good	6.504 \| good	0.168 \| good
2026-04-17T08:00:00.000Z	24 \| good	2.662 \| good	10.827 \| good	26.45 \| good	0.6 \| good	5.616 \| good	0.161 \| good
2026-04-17T09:00:00.000Z	21 \| good	1.487 \| good	6.041 \| good	22.517 \| good	0.594 \| good	4.728 \| good	0.154 \| good
2026-04-17T10:00:00.000Z	19 \| good	1.854 \| good	7.692 \| good	20.004 \| good	0.59 \| good	4.31 \| good	0.149 \| good
2026-04-17T11:00:00.000Z	17 \| good	1.915 \| good	7.823 \| good	18.198 \| good	0.585 \| good	3.892 \| good	0.145 \| good
2026-04-17T12:00:00.000Z	23 \| good	2.32 \| good	9.445 \| good	25.191 \| good	0.58 \| good	3.474 \| good	0.14 \| good
2026-04-17T13:00:00.000Z	20 \| good	1.548 \| good	6.27 \| good	21.502 \| good	0.619 \| good	4.243 \| good	0.146 \| good
2026-04-17T14:00:00.000Z	19 \| good	1.455 \| good	6.161 \| good	20.499 \| good	0.657 \| good	5.013 \| good	0.151 \| good
2026-04-17T15:00:00.000Z	26 \| good	1.438 \| good	5.675 \| good	28.477 \| good	0.696 \| good	5.782 \| good	0.157 \| good
2026-04-17T16:00:00.000Z	31 \| good	1.902 \| good	7.704 \| good	33.317 \| good	0.853 \| good	5.509 \| good	0.158 \| good
2026-04-17T17:00:00.000Z	32 \| good	3.157 \| good	13.659 \| good	34.829 \| good	1.011 \| good	5.237 \| good	0.16 \| good
2026-04-17T18:00:00.000Z	33 \| good	2.688 \| good	11.085 \| good	36.431 \| good	1.168 \| good	4.964 \| good	0.161 \| good
2026-04-17T19:00:00.000Z	34 \| good	3.1 \| good	13.321 \| good	36.777 \| good	1.172 \| good	5.036 \| good	0.164 \| good
2026-04-17T20:00:00.000Z	34 \| good	3.665 \| good	15.965 \| good	37.401 \| good	1.175 \| good	5.109 \| good	0.166 \| good
2026-04-17T21:00:00.000Z	36 \| good	3.991 \| good	17.344 \| good	39.15 \| good	1.178 \| good	5.181 \| good	0.169 \| good
2026-04-17T22:00:00.000Z	36 \| good	3.456 \| good	15.222 \| good	38.955 \| good	1.069 \| good	4.915 \| good	0.165 \| good
2026-04-17T23:00:00.000Z	35 \| good	3.722 \| good	16.534 \| good	38.061 \| good	0.961 \| good	4.649 \| good	0.162 \| good
2026-04-18T00:00:00.000Z	34 \| good	2.646 \| good	10.748 \| good	36.653 \| good	0.853 \| good	4.383 \| good	0.159 \| good
2026-04-18T01:00:00.000Z	36 \| good	2.249 \| good	9.065 \| good	38.713 \| good	0.833 \| good	5.669 \| good	0.164 \| good
2026-04-18T02:00:00.000Z	39 \| good	1.281 \| good	5.006 \| good	41.543 \| good	0.813 \| good	6.955 \| good	0.169 \| good
2026-04-18T03:00:00.000Z	37 \| good	2.094 \| good	8.612 \| good	39.78 \| good	0.793 \| good	8.241 \| good	0.174 \| good
2026-04-18T04:00:00.000Z	36 \| good	1.655 \| good	6.684 \| good	38.72 \| good	0.832 \| good	9.008 \| good	0.182 \| good
2026-04-18T05:00:00.000Z	35 \| good	1.396 \| good	5.631 \| good	38.168 \| good	0.871 \| good	9.776 \| good	0.191 \| good
2026-04-18T06:00:00.000Z	34 \| good	1.774 \| good	7.353 \| good	37.025 \| good	0.911 \| good	10.544 \| good	0.199 \| good
2026-04-18T07:00:00.000Z	32 \| good	2.241 \| good	9.172 \| good	35.185 \| good	0.85 \| good	10.321 \| good	0.203 \| good
2026-04-18T08:00:00.000Z	31 \| good	2.136 \| good	8.852 \| good	33.382 \| good	0.789 \| good	10.099 \| good	0.206 \| good
2026-04-18T09:00:00.000Z	29 \| good	1.673 \| good	6.896 \| good	31.283 \| good	0.729 \| good	9.877 \| good	0.209 \| good
2026-04-18T10:00:00.000Z	28 \| good	2.24 \| good	9.115 \| good	30.25 \| good	0.7 \| good	9.512 \| good	0.207 \| good
2026-04-18T11:00:00.000Z	26 \| good	2.338 \| good	9.628 \| good	28.125 \| good	0.672 \| good	9.147 \| good	0.205 \| good
2026-04-18T12:00:00.000Z	30 \| good	1.531 \| good	6.149 \| good	31.763 \| good	0.644 \| good	8.782 \| good	0.204 \| good
2026-04-18T13:00:00.000Z	23 \| good	1.051 \| good	4.298 \| good	25.462 \| good	0.721 \| good	7.873 \| good	0.209 \| good
2026-04-18T14:00:00.000Z	22 \| good	1.49 \| good	6.187 \| good	23.911 \| good	0.799 \| good	6.964 \| good	0.215 \| good
2026-04-18T15:00:00.000Z	25 \| good	2.268 \| good	9.383 \| good	27.23 \| good	0.876 \| good	6.054 \| good	0.221 \| good
2026-04-18T16:00:00.000Z	28 \| good	2.567 \| good	10.662 \| good	30.485 \| good	1.225 \| good	5.562 \| good	0.202 \| good
2026-04-18T17:00:00.000Z	30 \| good	3.668 \| good	16.017 \| good	31.914 \| good	1.573 \| good	5.07 \| good	0.183 \| good
2026-04-18T18:00:00.000Z	31 \| good	3.055 \| good	13.134 \| good	33.759 \| good	1.922 \| good	4.578 \| good	0.163 \| good
2026-04-18T19:00:00.000Z	33 \| good	2.771 \| good	11.319 \| good	36.05 \| good	1.895 \| good	4.464 \| good	0.164 \| good
2026-04-18T20:00:00.000Z	36 \| good	3.538 \| good	15.445 \| good	38.71 \| good	1.869 \| good	4.349 \| good	0.164 \| good
2026-04-18T21:00:00.000Z	38 \| good	3.577 \| good	15.215 \| good	40.542 \| good	1.843 \| good	4.235 \| good	0.164 \| good
2026-04-18T22:00:00.000Z	39 \| good	2.695 \| good	10.868 \| good	42.363 \| good	1.714 \| good	4.549 \| good	0.163 \| good
2026-04-18T23:00:00.000Z	40 \| good	2.739 \| good	11.741 \| good	43.476 \| good	1.585 \| good	4.863 \| good	0.163 \| good
2026-04-19T00:00:00.000Z	60 \| moderate	13.524 \| fine	18.014 \| good	44.06 \| good	1.467 \| good	5.205 \| good	0.162 \| good
2026-04-19T01:00:00.000Z	44 \| good	1.847 \| good	7.442 \| good	47.136 \| good	1.352 \| good	7.105 \| good	0.169 \| good
2026-04-19T02:00:00.000Z	44 \| good	0.913 \| good	3.522 \| good	48.193 \| good	1.247 \| good	9.032 \| good	0.176 \| good
2026-04-19T03:00:00.000Z	42 \| good	0.751 \| good	2.671 \| good	44.916 \| good	1.143 \| good	10.96 \| good	0.183 \| good
2026-04-19T04:00:00.000Z	38 \| good	0.731 \| good	2.641 \| good	40.867 \| good	1.115 \| good	11.115 \| good	0.187 \| good

Half Moon Bay

Empower business decisions with accurate air quality data

Real-time air quality map: Monitor AQI near Half Moon Bay, California

0.17ppm

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

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Frequently asked questions

How frequently does the air quality data for Half Moon Bay, California get updated?

Air quality updates for Half Moon Bay, California are available every hour.

What time in the past 24 hours saw the poorest air quality in Half Moon Bay, California?

Half Moon Bay, California experienced its worst air quality at 02:00:00, 2026-04-17.

When was air quality in Half Moon Bay, California the best over the past 24 hours?

The best air quality in Half Moon Bay, California was observed at 04:00:00 on 2026-04-16.

What is the air quality in Half Moon Bay, California right now?

The air quality in Half Moon Bay, California right now is Good, with an AQI of 37.

What pollutant is most frequently found in Half Moon Bay, California?

In Half Moon Bay, California, O3 is the most frequently found pollutant.

What can I do if the air quality in Half Moon Bay, California is poor?

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

What is the PM_2.5 concentration in Half Moon Bay, California right now?

Half Moon Bay, California currently has a PM_2.5 concentration of 2.246 μg/m³.

What is the current level of PM₁₀ in Half Moon Bay, California?

Half Moon Bay, California currently has a PM₁₀ concentration of 8.972 μg/m³.

What is the current level of carbon monoxide (CO) in Half Moon Bay, California?

The current carbon monoxide (CO) level in Half Moon Bay, California is 0.169 ppm.

What is the current level of sulfur dioxide (SO₂) in Half Moon Bay, California?

The current sulfur dioxide (SO₂) concentration in Half Moon Bay, California is 0.467 ppb.

What is the current level of ozone (O₃) in Half Moon Bay, California?

Half Moon Bay, California currently has an ozone (O₃) concentration of 40.286 ppm.

What is the current level of nitrogen dioxide (NO₂) in Half Moon Bay, California?

The current level of nitrogen dioxide (NO₂) in Half Moon Bay, California is 5.969 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-04-15T05:00:00.000Z	34 \| good	4.091 \| good	17.628 \| good	37.007 \| good	0.265 \| good	3.179 \| good	0.314 \| good
2026-04-15T06:00:00.000Z	36 \| good	3.364 \| good	19.126 \| good	39.429 \| good	0.249 \| good	3.095 \| good	0.314 \| good
2026-04-15T07:00:00.000Z	33 \| good	2.842 \| good	16.257 \| good	36.491 \| good	0.393 \| good	3.04 \| good	0.314 \| good
2026-04-15T08:00:00.000Z	33 \| good	3.015 \| good	12.595 \| good	35.951 \| good	0.249 \| good	3.679 \| good	0.312 \| good
2026-04-15T09:00:00.000Z	29 \| good	3.534 \| good	15.055 \| good	30.8 \| good	0.233 \| good	4.424 \| good	0.293 \| good
2026-04-15T10:00:00.000Z	28 \| good	3.755 \| good	17.691 \| good	30.309 \| good	0.249 \| good	4.394 \| good	0.311 \| good
2026-04-15T11:00:00.000Z	28 \| good	3.841 \| good	13.356 \| good	30.185 \| good	0.434 \| good	3.947 \| good	0.311 \| good
2026-04-15T12:00:00.000Z	20 \| good	2.769 \| good	12.816 \| good	21.626 \| good	0.49 \| good	4.049 \| good	0.311 \| good
2026-04-15T13:00:00.000Z	27 \| good	3.732 \| good	13.16 \| good	28.799 \| good	0.651 \| good	4.054 \| good	0.293 \| good
2026-04-15T14:00:00.000Z	27 \| good	5.365 \| good	19.062 \| good	26.71 \| good	0.369 \| good	14.209 \| good	0.452 \| good
2026-04-15T15:00:00.000Z	29 \| good	5.439 \| good	22.341 \| good	31.293 \| good	0.585 \| good	12.675 \| good	0.477 \| good
2026-04-15T16:00:00.000Z	29 \| good	3.763 \| good	9.983 \| good	30.956 \| good	0.546 \| good	8.524 \| good	0.431 \| good
2026-04-15T17:00:00.000Z	30 \| good	3.086 \| good	9.35 \| good	31.686 \| good	0.414 \| good	7.074 \| good	0.375 \| good
2026-04-15T18:00:00.000Z	27 \| good	4.221 \| good	13.274 \| good	28.603 \| good	0.375 \| good	6.243 \| good	0.356 \| good
2026-04-15T19:00:00.000Z	26 \| good	3.219 \| good	15.012 \| good	28.189 \| good	0.678 \| good	5.646 \| good	0.314 \| good
2026-04-15T20:00:00.000Z	30 \| good	4.062 \| good	19.233 \| good	31.941 \| good	0.358 \| good	4.922 \| good	0.352 \| good
2026-04-15T21:00:00.000Z	31 \| good	4.378 \| good	16.112 \| good	33.746 \| good	0.313 \| good	4.826 \| good	0.356 \| good
2026-04-15T22:00:00.000Z	33 \| good	2.541 \| good	10.769 \| good	36.133 \| good	0.398 \| good	4.665 \| good	0.328 \| good
2026-04-15T23:00:00.000Z	34 \| good	3.191 \| good	8.717 \| good	36.577 \| good	0.411 \| good	4.764 \| good	0.345 \| good
2026-04-16T00:00:00.000Z	34 \| good	3.76 \| good	10.562 \| good	36.873 \| good	0.341 \| good	4.456 \| good	0.345 \| good
2026-04-16T01:00:00.000Z	35 \| good	2.222 \| good	9.586 \| good	37.871 \| good	0.388 \| good	3.672 \| good	0.328 \| good
2026-04-16T02:00:00.000Z	37 \| good	2.278 \| good	18.289 \| good	40.297 \| good	0.42 \| good	3.832 \| good	0.328 \| good
2026-04-16T03:00:00.000Z	36 \| good	2.642 \| good	13.22 \| good	38.901 \| good	0.491 \| good	4.278 \| good	0.328 \| good
2026-04-16T04:00:00.000Z	39 \| good	3.354 \| good	14.506 \| good	41.578 \| good	0.482 \| good	3.917 \| good	0.345 \| good
2026-04-16T05:00:00.000Z	33 \| good	3.267 \| good	14.196 \| good	35.716 \| good	0.28 \| good	3.698 \| good	0.345 \| good
2026-04-16T06:00:00.000Z	31 \| good	3.906 \| good	16.719 \| good	33.76 \| good	0.424 \| good	3.687 \| good	0.345 \| good
2026-04-16T07:00:00.000Z	31 \| good	2.366 \| good	10.933 \| good	33.795 \| good	0.383 \| good	3.186 \| good	0.345 \| good
2026-04-16T08:00:00.000Z	31 \| good	2.794 \| good	9.236 \| good	34.155 \| good	0.44 \| good	2.285 \| good	0.328 \| good
2026-04-16T09:00:00.000Z	31 \| good	2.066 \| good	12.109 \| good	33.949 \| good	0.481 \| good	1.39 \| good	0.294 \| good
2026-04-16T10:00:00.000Z	34 \| good	2.211 \| good	8.754 \| good	36.53 \| good	0.377 \| good	1.843 \| good	0.294 \| good
2026-04-16T11:00:00.000Z	31 \| good	2.947 \| good	10.95 \| good	32.849 \| good	0.414 \| good	2.799 \| good	0.294 \| good
2026-04-16T12:00:00.000Z	33 \| good	1.999 \| good	11.533 \| good	36.468 \| good	0.414 \| good	2.799 \| good	0.294 \| good
2026-04-16T13:00:00.000Z	32 \| good	2.8 \| good	9.039 \| good	34.973 \| good	0.414 \| good	2.798 \| good	0.294 \| good
2026-04-16T14:00:00.000Z	27 \| good	1.929 \| good	8.119 \| good	29.038 \| good	0.251 \| good	8.457 \| good	0.391 \| good
2026-04-16T15:00:00.000Z	28 \| good	2.439 \| good	3.935 \| good	29.865 \| good	0.28 \| good	6.573 \| good	0.402 \| good
2026-04-16T16:00:00.000Z	22 \| good	2.35 \| good	7.807 \| good	24.036 \| good	0.301 \| good	4.104 \| good	0.377 \| good
2026-04-16T17:00:00.000Z	27 \| good	3.32 \| good	12.47 \| good	29.008 \| good	0.299 \| good	5.547 \| good	0.345 \| good
2026-04-16T18:00:00.000Z	32 \| good	2.298 \| good	12.071 \| good	35 \| good	0.492 \| good	3.926 \| good	0.227 \| good
2026-04-16T19:00:00.000Z	32 \| good	3.092 \| good	10.541 \| good	35.429 \| good	0.29 \| good	4.263 \| good	0.294 \| good
2026-04-16T20:00:00.000Z	33 \| good	3.009 \| good	17.159 \| good	36.369 \| good	0.444 \| good	3.589 \| good	0.294 \| good
2026-04-16T21:00:00.000Z	36 \| good	2.887 \| good	16.708 \| good	39.108 \| good	0.338 \| good	2.862 \| good	0.227 \| good
2026-04-16T22:00:00.000Z	40 \| good	2.738 \| good	14.021 \| good	43.474 \| good	0.42 \| good	3.536 \| good	0.245 \| good
2026-04-16T23:00:00.000Z	43 \| good	2.377 \| good	12.249 \| good	45.57 \| good	0.407 \| good	5.175 \| good	0.245 \| good
2026-04-17T00:00:00.000Z	40 \| good	2.742 \| good	21.639 \| good	42.739 \| good	0.424 \| good	5.283 \| good	0.245 \| good
2026-04-17T01:00:00.000Z	39 \| good	2.154 \| good	8.737 \| good	42.016 \| good	0.403 \| good	4.975 \| good	0.283 \| good
2026-04-17T02:00:00.000Z	45 \| good	1.168 \| good	9.952 \| good	48.955 \| good	0.431 \| good	3.599 \| good	0.265 \| good
2026-04-17T03:00:00.000Z	37 \| good	2.246 \| good	8.972 \| good	40.286 \| good	0.467 \| good	5.969 \| good	0.169 \| good
2026-04-17T04:00:00.000Z	37 \| good	2.246 \| good	8.972 \| good	40.286 \| good	0.467 \| good	5.969 \| good	0.169 \| good
2026-04-17T05:00:00.000Z	32 \| good	1.818 \| good	7.695 \| good	35.488 \| good	0.561 \| good	7.01 \| good	0.173 \| good
2026-04-17T06:00:00.000Z	31 \| good	2.523 \| good	10.097 \| good	33.125 \| good	0.611 \| good	7.393 \| good	0.174 \| good
2026-04-17T07:00:00.000Z	28 \| good	3.349 \| good	14.778 \| good	30.217 \| good	0.605 \| good	6.504 \| good	0.168 \| good
2026-04-17T08:00:00.000Z	24 \| good	2.662 \| good	10.827 \| good	26.45 \| good	0.6 \| good	5.616 \| good	0.161 \| good
2026-04-17T09:00:00.000Z	21 \| good	1.487 \| good	6.041 \| good	22.517 \| good	0.594 \| good	4.728 \| good	0.154 \| good
2026-04-17T10:00:00.000Z	19 \| good	1.854 \| good	7.692 \| good	20.004 \| good	0.59 \| good	4.31 \| good	0.149 \| good
2026-04-17T11:00:00.000Z	17 \| good	1.915 \| good	7.823 \| good	18.198 \| good	0.585 \| good	3.892 \| good	0.145 \| good
2026-04-17T12:00:00.000Z	23 \| good	2.32 \| good	9.445 \| good	25.191 \| good	0.58 \| good	3.474 \| good	0.14 \| good
2026-04-17T13:00:00.000Z	20 \| good	1.548 \| good	6.27 \| good	21.502 \| good	0.619 \| good	4.243 \| good	0.146 \| good
2026-04-17T14:00:00.000Z	19 \| good	1.455 \| good	6.161 \| good	20.499 \| good	0.657 \| good	5.013 \| good	0.151 \| good
2026-04-17T15:00:00.000Z	26 \| good	1.438 \| good	5.675 \| good	28.477 \| good	0.696 \| good	5.782 \| good	0.157 \| good
2026-04-17T16:00:00.000Z	31 \| good	1.902 \| good	7.704 \| good	33.317 \| good	0.853 \| good	5.509 \| good	0.158 \| good
2026-04-17T17:00:00.000Z	32 \| good	3.157 \| good	13.659 \| good	34.829 \| good	1.011 \| good	5.237 \| good	0.16 \| good
2026-04-17T18:00:00.000Z	33 \| good	2.688 \| good	11.085 \| good	36.431 \| good	1.168 \| good	4.964 \| good	0.161 \| good
2026-04-17T19:00:00.000Z	34 \| good	3.1 \| good	13.321 \| good	36.777 \| good	1.172 \| good	5.036 \| good	0.164 \| good
2026-04-17T20:00:00.000Z	34 \| good	3.665 \| good	15.965 \| good	37.401 \| good	1.175 \| good	5.109 \| good	0.166 \| good
2026-04-17T21:00:00.000Z	36 \| good	3.991 \| good	17.344 \| good	39.15 \| good	1.178 \| good	5.181 \| good	0.169 \| good
2026-04-17T22:00:00.000Z	36 \| good	3.456 \| good	15.222 \| good	38.955 \| good	1.069 \| good	4.915 \| good	0.165 \| good
2026-04-17T23:00:00.000Z	35 \| good	3.722 \| good	16.534 \| good	38.061 \| good	0.961 \| good	4.649 \| good	0.162 \| good
2026-04-18T00:00:00.000Z	34 \| good	2.646 \| good	10.748 \| good	36.653 \| good	0.853 \| good	4.383 \| good	0.159 \| good
2026-04-18T01:00:00.000Z	36 \| good	2.249 \| good	9.065 \| good	38.713 \| good	0.833 \| good	5.669 \| good	0.164 \| good
2026-04-18T02:00:00.000Z	39 \| good	1.281 \| good	5.006 \| good	41.543 \| good	0.813 \| good	6.955 \| good	0.169 \| good
2026-04-18T03:00:00.000Z	37 \| good	2.094 \| good	8.612 \| good	39.78 \| good	0.793 \| good	8.241 \| good	0.174 \| good
2026-04-18T04:00:00.000Z	36 \| good	1.655 \| good	6.684 \| good	38.72 \| good	0.832 \| good	9.008 \| good	0.182 \| good
2026-04-18T05:00:00.000Z	35 \| good	1.396 \| good	5.631 \| good	38.168 \| good	0.871 \| good	9.776 \| good	0.191 \| good
2026-04-18T06:00:00.000Z	34 \| good	1.774 \| good	7.353 \| good	37.025 \| good	0.911 \| good	10.544 \| good	0.199 \| good
2026-04-18T07:00:00.000Z	32 \| good	2.241 \| good	9.172 \| good	35.185 \| good	0.85 \| good	10.321 \| good	0.203 \| good
2026-04-18T08:00:00.000Z	31 \| good	2.136 \| good	8.852 \| good	33.382 \| good	0.789 \| good	10.099 \| good	0.206 \| good
2026-04-18T09:00:00.000Z	29 \| good	1.673 \| good	6.896 \| good	31.283 \| good	0.729 \| good	9.877 \| good	0.209 \| good
2026-04-18T10:00:00.000Z	28 \| good	2.24 \| good	9.115 \| good	30.25 \| good	0.7 \| good	9.512 \| good	0.207 \| good
2026-04-18T11:00:00.000Z	26 \| good	2.338 \| good	9.628 \| good	28.125 \| good	0.672 \| good	9.147 \| good	0.205 \| good
2026-04-18T12:00:00.000Z	30 \| good	1.531 \| good	6.149 \| good	31.763 \| good	0.644 \| good	8.782 \| good	0.204 \| good
2026-04-18T13:00:00.000Z	23 \| good	1.051 \| good	4.298 \| good	25.462 \| good	0.721 \| good	7.873 \| good	0.209 \| good
2026-04-18T14:00:00.000Z	22 \| good	1.49 \| good	6.187 \| good	23.911 \| good	0.799 \| good	6.964 \| good	0.215 \| good
2026-04-18T15:00:00.000Z	25 \| good	2.268 \| good	9.383 \| good	27.23 \| good	0.876 \| good	6.054 \| good	0.221 \| good
2026-04-18T16:00:00.000Z	28 \| good	2.567 \| good	10.662 \| good	30.485 \| good	1.225 \| good	5.562 \| good	0.202 \| good
2026-04-18T17:00:00.000Z	30 \| good	3.668 \| good	16.017 \| good	31.914 \| good	1.573 \| good	5.07 \| good	0.183 \| good
2026-04-18T18:00:00.000Z	31 \| good	3.055 \| good	13.134 \| good	33.759 \| good	1.922 \| good	4.578 \| good	0.163 \| good
2026-04-18T19:00:00.000Z	33 \| good	2.771 \| good	11.319 \| good	36.05 \| good	1.895 \| good	4.464 \| good	0.164 \| good
2026-04-18T20:00:00.000Z	36 \| good	3.538 \| good	15.445 \| good	38.71 \| good	1.869 \| good	4.349 \| good	0.164 \| good
2026-04-18T21:00:00.000Z	38 \| good	3.577 \| good	15.215 \| good	40.542 \| good	1.843 \| good	4.235 \| good	0.164 \| good
2026-04-18T22:00:00.000Z	39 \| good	2.695 \| good	10.868 \| good	42.363 \| good	1.714 \| good	4.549 \| good	0.163 \| good
2026-04-18T23:00:00.000Z	40 \| good	2.739 \| good	11.741 \| good	43.476 \| good	1.585 \| good	4.863 \| good	0.163 \| good
2026-04-19T00:00:00.000Z	60 \| moderate	13.524 \| fine	18.014 \| good	44.06 \| good	1.467 \| good	5.205 \| good	0.162 \| good
2026-04-19T01:00:00.000Z	44 \| good	1.847 \| good	7.442 \| good	47.136 \| good	1.352 \| good	7.105 \| good	0.169 \| good
2026-04-19T02:00:00.000Z	44 \| good	0.913 \| good	3.522 \| good	48.193 \| good	1.247 \| good	9.032 \| good	0.176 \| good
2026-04-19T03:00:00.000Z	42 \| good	0.751 \| good	2.671 \| good	44.916 \| good	1.143 \| good	10.96 \| good	0.183 \| good
2026-04-19T04:00:00.000Z	38 \| good	0.731 \| good	2.641 \| good	40.867 \| good	1.115 \| good	11.115 \| good	0.187 \| good

Current air quality index in Half Moon Bay, California today

Common air pollutants in Half Moon Bay, California

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Half Moon Bay, California air quality forecast and history

Empower business decisions with accurate air quality data

Real-time air quality map: Monitor AQI near Half Moon Bay, California

Air quality in nearby cities

Hillsborough, California

San Mateo, California

Burlingame, California

Belmont, California

Millbrae, California

San Carlos, 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 Half Moon Bay, California get updated?

What time in the past 24 hours saw the poorest air quality in Half Moon Bay, California?

When was air quality in Half Moon Bay, California the best over the past 24 hours?

What is the air quality in Half Moon Bay, California right now?

What pollutant is most frequently found in Half Moon Bay, California?

What can I do if the air quality in Half Moon Bay, California is poor?

What is the PM2.5 concentration in Half Moon Bay, California right now?

What is the current level of PM10 in Half Moon Bay, California?

What is the current level of carbon monoxide (CO) in Half Moon Bay, California?

What is the current level of sulfur dioxide (SO2) in Half Moon Bay, California?

What is the current level of ozone (O3) in Half Moon Bay, California?

What is the current level of nitrogen dioxide (NO2) in Half Moon Bay, 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 Half Moon Bay, California right now?

What is the current level of PM₁₀ in Half Moon Bay, California?

What is the current level of sulfur dioxide (SO₂) in Half Moon Bay, California?

What is the current level of ozone (O₃) in Half Moon Bay, California?

What is the current level of nitrogen dioxide (NO₂) in Half Moon Bay, California?