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

Half Moon Bay, California currently has a PM10 concentration of 19.769 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 0.87 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 29.149 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 3.168 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 4.641 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)

4.64 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

19.77 μg/m³

155

255

425

605+

Ozone (O₃)

29.15 ppb

201

201+

Sulfur Dioxide (SO₂)

0.87 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

3.17 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.24 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

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
2026-08-22T02:00:00.000Z	26 \| good	1.643 \| good	10.415 \| good	27.809 \| good	0.416 \| good	2.146 \| good	0.233 \| good
2026-08-22T03:00:00.000Z	27 \| good	3.332 \| good	23.97 \| good	28.773 \| good	0.451 \| good	3.304 \| good	0.233 \| good
2026-08-22T04:00:00.000Z	21 \| good	1.62 \| good	8.399 \| good	22.923 \| good	0.472 \| good	3.974 \| good	0.276 \| good
2026-08-22T05:00:00.000Z	20 \| good	2.559 \| good	14.168 \| good	22.192 \| good	0.434 \| good	3.465 \| good	0.276 \| good
2026-08-22T06:00:00.000Z	22 \| good	2.988 \| good	15.598 \| good	24.307 \| good	0.427 \| good	3.522 \| good	0.261 \| good
2026-08-22T07:00:00.000Z	22 \| good	3.04 \| good	13.845 \| good	24.184 \| good	0.444 \| good	3.136 \| good	0.244 \| good
2026-08-22T08:00:00.000Z	21 \| good	2.804 \| good	10.782 \| good	23.336 \| good	0.393 \| good	2.999 \| good	0.244 \| good
2026-08-22T09:00:00.000Z	27 \| good	4.699 \| good	22.314 \| good	22.906 \| good	0.393 \| good	3.051 \| good	0.244 \| good
2026-08-22T10:00:00.000Z	21 \| good	3.455 \| good	10.97 \| good	22.952 \| good	0.537 \| good	2.314 \| good	0.11 \| good
2026-08-22T11:00:00.000Z	21 \| good	2.983 \| good	14.157 \| good	22.62 \| good	0.797 \| good	2.152 \| good	0.11 \| good
2026-08-22T12:00:00.000Z	18 \| good	3.288 \| good	12.611 \| good	19.216 \| good	0.316 \| good	4.114 \| good	0.27 \| good
2026-08-22T13:00:00.000Z	19 \| good	2.677 \| good	9.244 \| good	21.466 \| good	0.327 \| good	2.375 \| good	0.209 \| good
2026-08-22T14:00:00.000Z	22 \| good	3.945 \| good	16.843 \| good	21.163 \| good	0.343 \| good	3.275 \| good	0.209 \| good
2026-08-22T15:00:00.000Z	22 \| good	4.265 \| good	20.074 \| good	19.509 \| good	0.344 \| good	3.896 \| good	0.256 \| good
2026-08-22T16:00:00.000Z	33 \| good	5.585 \| good	21.563 \| good	21.628 \| good	0.389 \| good	3.335 \| good	0.261 \| good
2026-08-22T17:00:00.000Z	27 \| good	4.711 \| good	21.41 \| good	21.599 \| good	0.444 \| good	3.277 \| good	0.276 \| good
2026-08-22T18:00:00.000Z	22 \| good	3.696 \| good	17.518 \| good	20.817 \| good	0.432 \| good	3.039 \| good	0.258 \| good
2026-08-22T19:00:00.000Z	22 \| good	4.41 \| good	21.88 \| good	21.955 \| good	0.448 \| good	2.333 \| good	0.217 \| good
2026-08-22T20:00:00.000Z	21 \| good	3.258 \| good	10.788 \| good	22.817 \| good	0.488 \| good	2.395 \| good	0.233 \| good
2026-08-22T21:00:00.000Z	22 \| good	4.113 \| good	11.404 \| good	21.621 \| good	0.46 \| good	2.238 \| good	0.233 \| good
2026-08-22T22:00:00.000Z	20 \| good	3.201 \| good	10.804 \| good	21.945 \| good	0.51 \| good	2.571 \| good	0.233 \| good
2026-08-22T23:00:00.000Z	22 \| good	4.258 \| good	19.443 \| good	20.274 \| good	0.487 \| good	2.921 \| good	0.217 \| good
2026-08-23T00:00:00.000Z	22 \| good	4.176 \| good	15.673 \| good	21.459 \| good	0.494 \| good	3.075 \| good	0.274 \| good
2026-08-23T01:00:00.000Z	22 \| good	2.722 \| good	16.365 \| good	23.596 \| good	0.505 \| good	1.977 \| good	0.233 \| good
2026-08-23T02:00:00.000Z	25 \| good	3.119 \| good	13.807 \| good	27.236 \| good	0.46 \| good	1.637 \| good	0.327 \| good
2026-08-23T03:00:00.000Z	22 \| good	4.336 \| good	18.764 \| good	22.052 \| good	0.335 \| good	4.194 \| good	0.086 \| good
2026-08-23T04:00:00.000Z	29 \| good	2.161 \| good	14.041 \| good	30.527 \| good	0.459 \| good	3.931 \| good	0.233 \| good
2026-08-23T05:00:00.000Z	24 \| good	3.755 \| good	16.006 \| good	25.87 \| good	0.42 \| good	4.876 \| good	0.233 \| good
2026-08-23T06:00:00.000Z	27 \| good	3.338 \| good	19.328 \| good	28.649 \| good	0.46 \| good	4.09 \| good	0.233 \| good
2026-08-23T07:00:00.000Z	24 \| good	3.283 \| good	15.101 \| good	26.299 \| good	0.46 \| good	3.17 \| good	0.217 \| good
2026-08-23T08:00:00.000Z	22 \| good	3.627 \| good	15.854 \| good	19.942 \| good	0.477 \| good	2.679 \| good	0.263 \| good
2026-08-23T09:00:00.000Z	27 \| good	4.788 \| good	21.357 \| good	18.336 \| good	0.476 \| good	2.674 \| good	0.263 \| good
2026-08-23T10:00:00.000Z	27 \| good	5.042 \| good	22.898 \| good	18.152 \| good	0.554 \| good	4.261 \| good	0.11 \| good
2026-08-23T11:00:00.000Z	22 \| good	4.381 \| good	14.007 \| good	18.023 \| good	0.579 \| good	4.281 \| good	0.11 \| good
2026-08-23T12:00:00.000Z	33 \| good	6.317 \| good	13.67 \| good	18.823 \| good	0.356 \| good	4.785 \| good	0.285 \| good
2026-08-23T13:00:00.000Z	22 \| good	4.195 \| good	18.055 \| good	13.413 \| good	0.558 \| good	3.216 \| good	0.244 \| good
2026-08-23T14:00:00.000Z	22 \| good	4.067 \| good	15.434 \| good	12.071 \| good	0.465 \| good	3.83 \| good	0.244 \| good
2026-08-23T15:00:00.000Z	22 \| good	3.675 \| good	9.571 \| good	12.508 \| good	0.438 \| good	4.465 \| good	0.274 \| good
2026-08-23T16:00:00.000Z	22 \| good	4.279 \| good	16.714 \| good	15.562 \| good	0.46 \| good	4.261 \| good	0.244 \| good
2026-08-23T17:00:00.000Z	27 \| good	4.996 \| good	17.692 \| good	15.621 \| good	0.434 \| good	3.956 \| good	0.276 \| good
2026-08-23T18:00:00.000Z	33 \| good	6.013 \| good	28.028 \| good	16.473 \| good	0.672 \| good	3.608 \| good	0.295 \| good
2026-08-23T19:00:00.000Z	27 \| good	5.191 \| good	26.338 \| good	17.706 \| good	0.839 \| good	3.391 \| good	0.292 \| good
2026-08-23T20:00:00.000Z	22 \| good	3.893 \| good	11.291 \| good	21.333 \| good	1.176 \| good	3.73 \| good	0.285 \| good
2026-08-23T21:00:00.000Z	22 \| good	4.004 \| good	13.922 \| good	20.867 \| good	1.638 \| good	3.617 \| good	0.268 \| good
2026-08-23T22:00:00.000Z	33 \| good	6.443 \| good	25.312 \| good	22.367 \| good	1.387 \| good	3.153 \| good	0.251 \| good
2026-08-23T23:00:00.000Z	38 \| good	6.794 \| good	19.623 \| good	27.76 \| good	1.313 \| good	3.412 \| good	0.278 \| good
2026-08-24T00:00:00.000Z	33 \| good	5.532 \| good	25.369 \| good	27.642 \| good	1.105 \| good	3.425 \| good	0.295 \| good
2026-08-24T01:00:00.000Z	27 \| good	4.641 \| good	19.769 \| good	29.149 \| good	0.87 \| good	3.168 \| good	0.244 \| good
2026-08-24T01:00:00.000Z	27 \| good	4.641 \| good	19.769 \| good	29.149 \| good	0.87 \| good	3.168 \| good	0.244 \| good
2026-08-23T07:00:00.000Z	22 \| good	4.368 \| good	19.074 \| good	20.409 \| good	0.312 \| good	4.123 \| good	0.085 \| good
2026-08-23T08:00:00.000Z	22 \| good	3.831 \| good	16.675 \| good	19.274 \| good	0.309 \| good	3.495 \| good	0.084 \| good
2026-08-23T09:00:00.000Z	22 \| good	4.325 \| good	18.957 \| good	19.48 \| good	0.304 \| good	3.121 \| good	0.084 \| good
2026-08-23T10:00:00.000Z	27 \| good	4.587 \| good	20.004 \| good	19.378 \| good	0.301 \| good	2.769 \| good	0.083 \| good
2026-08-23T11:00:00.000Z	22 \| good	3.774 \| good	16.345 \| good	18.427 \| good	0.3 \| good	2.535 \| good	0.082 \| good
2026-08-23T12:00:00.000Z	18 \| good	2.481 \| good	10.126 \| good	19.407 \| good	0.293 \| good	2.691 \| good	0.083 \| good
2026-08-23T13:00:00.000Z	19 \| good	2.673 \| good	11.098 \| good	20.074 \| good	0.294 \| good	2.835 \| good	0.083 \| good
2026-08-23T14:00:00.000Z	18 \| good	3.098 \| good	12.772 \| good	18.572 \| good	0.302 \| good	2.747 \| good	0.083 \| good
2026-08-23T15:00:00.000Z	22 \| good	4.053 \| good	17.792 \| good	16.918 \| good	0.329 \| good	2.445 \| good	0.083 \| good
2026-08-23T16:00:00.000Z	27 \| good	5.088 \| good	21.751 \| good	18.087 \| good	0.351 \| good	2.217 \| good	0.083 \| good
2026-08-23T17:00:00.000Z	27 \| good	4.598 \| good	19.896 \| good	20.321 \| good	0.376 \| good	1.909 \| good	0.083 \| good
2026-08-23T18:00:00.000Z	21 \| good	3.044 \| good	12.606 \| good	23.412 \| good	0.406 \| good	1.583 \| good	0.082 \| good
2026-08-23T19:00:00.000Z	23 \| good	2.452 \| good	9.973 \| good	24.847 \| good	0.427 \| good	1.459 \| good	0.082 \| good
2026-08-23T20:00:00.000Z	22 \| good	2.464 \| good	10.109 \| good	23.665 \| good	0.438 \| good	1.352 \| good	0.081 \| good
2026-08-23T21:00:00.000Z	22 \| good	3.384 \| good	14.66 \| good	23.635 \| good	0.44 \| good	1.29 \| good	0.081 \| good
2026-08-23T22:00:00.000Z	27 \| good	4.551 \| good	19.764 \| good	24.787 \| good	0.426 \| good	1.359 \| good	0.08 \| good
2026-08-23T23:00:00.000Z	23 \| good	3.615 \| good	15.969 \| good	25.492 \| good	0.407 \| good	1.564 \| good	0.079 \| good
2026-08-24T00:00:00.000Z	27 \| good	4.786 \| good	20.821 \| good	24.043 \| good	0.392 \| good	1.909 \| good	0.078 \| good
2026-08-24T01:00:00.000Z	21 \| good	3.371 \| good	14.831 \| good	23.401 \| good	0.389 \| good	2.573 \| good	0.079 \| good
2026-08-24T02:00:00.000Z	21 \| good	2.25 \| good	9.188 \| good	23.055 \| good	0.377 \| good	3.452 \| good	0.081 \| good
2026-08-24T03:00:00.000Z	23 \| good	3.135 \| good	13.563 \| good	25.149 \| good	0.368 \| good	4.102 \| good	0.081 \| good
2026-08-24T04:00:00.000Z	23 \| good	2.51 \| good	10.193 \| good	24.774 \| good	0.366 \| good	4.082 \| good	0.081 \| good
2026-08-24T05:00:00.000Z	22 \| good	1.696 \| good	7.034 \| good	23.581 \| good	0.372 \| good	3.738 \| good	0.081 \| good
2026-08-24T06:00:00.000Z	20 \| good	1.797 \| good	7.332 \| good	22.088 \| good	0.366 \| good	3.575 \| good	0.081 \| good
2026-08-24T07:00:00.000Z	20 \| good	1.494 \| good	6.034 \| good	21.806 \| good	0.362 \| good	3.426 \| good	0.081 \| good
2026-08-24T08:00:00.000Z	21 \| good	1.607 \| good	6.587 \| good	23.13 \| good	0.354 \| good	3.304 \| good	0.081 \| good
2026-08-24T09:00:00.000Z	21 \| good	1.536 \| good	6.389 \| good	23.213 \| good	0.346 \| good	3.145 \| good	0.08 \| good
2026-08-24T10:00:00.000Z	22 \| good	2.019 \| good	8.17 \| good	23.628 \| good	0.335 \| good	2.979 \| good	0.08 \| good
2026-08-24T11:00:00.000Z	21 \| good	2.325 \| good	9.331 \| good	22.659 \| good	0.326 \| good	2.836 \| good	0.08 \| good
2026-08-24T12:00:00.000Z	20 \| good	1.398 \| good	5.445 \| good	21.992 \| good	0.325 \| good	2.62 \| good	0.079 \| good
2026-08-24T13:00:00.000Z	22 \| good	1.65 \| good	6.924 \| good	24.123 \| good	0.326 \| good	2.55 \| good	0.079 \| good
2026-08-24T14:00:00.000Z	21 \| good	1.405 \| good	5.499 \| good	22.851 \| good	0.327 \| good	2.501 \| good	0.08 \| good
2026-08-24T15:00:00.000Z	19 \| good	1.542 \| good	6.329 \| good	20.057 \| good	0.336 \| good	2.377 \| good	0.081 \| good
2026-08-24T16:00:00.000Z	19 \| good	3.343 \| good	14.412 \| good	21.466 \| good	0.342 \| good	2.234 \| good	0.082 \| good
2026-08-24T17:00:00.000Z	21 \| good	2.298 \| good	9.574 \| good	22.636 \| good	0.347 \| good	1.849 \| good	0.082 \| good
2026-08-24T18:00:00.000Z	23 \| good	1.823 \| good	7.578 \| good	24.653 \| good	0.352 \| good	1.535 \| good	0.082 \| good
2026-08-24T19:00:00.000Z	24 \| good	2.029 \| good	8.167 \| good	26.002 \| good	0.353 \| good	1.27 \| good	0.081 \| good
2026-08-24T20:00:00.000Z	24 \| good	2.112 \| good	8.559 \| good	26.001 \| good	0.358 \| good	1.074 \| good	0.081 \| good
2026-08-24T21:00:00.000Z	22 \| good	2.154 \| good	8.71 \| good	24.456 \| good	0.36 \| good	1.005 \| good	0.081 \| good
2026-08-24T22:00:00.000Z	23 \| good	2.735 \| good	11.278 \| good	25.307 \| good	0.358 \| good	1.022 \| good	0.082 \| good
2026-08-24T23:00:00.000Z	24 \| good	2.688 \| good	11 \| good	25.685 \| good	0.355 \| good	1.148 \| good	0.082 \| good
2026-08-25T00:00:00.000Z	22 \| good	3.068 \| good	12.788 \| good	24.415 \| good	0.348 \| good	1.334 \| good	0.083 \| good
2026-08-25T01:00:00.000Z	21 \| good	2.931 \| good	12.261 \| good	23.371 \| good	0.339 \| good	1.754 \| good	0.084 \| good
2026-08-25T02:00:00.000Z	22 \| good	2.658 \| good	10.846 \| good	23.831 \| good	0.328 \| good	2.312 \| good	0.085 \| good
2026-08-25T03:00:00.000Z	24 \| good	2.034 \| good	8.368 \| good	26.278 \| good	0.325 \| good	2.735 \| good	0.086 \| good
2026-08-25T04:00:00.000Z	24 \| good	2.198 \| good	9.078 \| good	25.559 \| good	0.332 \| good	2.768 \| good	0.086 \| good
2026-08-25T05:00:00.000Z	24 \| good	1.692 \| good	6.972 \| good	25.912 \| good	0.34 \| good	2.688 \| good	0.086 \| good
2026-08-25T06:00:00.000Z	49 \| good	8.851 \| good	12.843 \| good	26.378 \| good	0.351 \| good	2.761 \| good	0.087 \| good

Half Moon Bay

Empower business decisions with accurate air quality data

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

0.13ppm

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 11:00:00, 2026-08-23.

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 09:00:00 on 2026-08-23.

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 27.

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 4.641 μg/m³.

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

Half Moon Bay, California currently has a PM₁₀ concentration of 19.769 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 0.244 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 0.87 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 29.149 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 3.168 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-08-22T02:00:00.000Z	26 \| good	1.643 \| good	10.415 \| good	27.809 \| good	0.416 \| good	2.146 \| good	0.233 \| good
2026-08-22T03:00:00.000Z	27 \| good	3.332 \| good	23.97 \| good	28.773 \| good	0.451 \| good	3.304 \| good	0.233 \| good
2026-08-22T04:00:00.000Z	21 \| good	1.62 \| good	8.399 \| good	22.923 \| good	0.472 \| good	3.974 \| good	0.276 \| good
2026-08-22T05:00:00.000Z	20 \| good	2.559 \| good	14.168 \| good	22.192 \| good	0.434 \| good	3.465 \| good	0.276 \| good
2026-08-22T06:00:00.000Z	22 \| good	2.988 \| good	15.598 \| good	24.307 \| good	0.427 \| good	3.522 \| good	0.261 \| good
2026-08-22T07:00:00.000Z	22 \| good	3.04 \| good	13.845 \| good	24.184 \| good	0.444 \| good	3.136 \| good	0.244 \| good
2026-08-22T08:00:00.000Z	21 \| good	2.804 \| good	10.782 \| good	23.336 \| good	0.393 \| good	2.999 \| good	0.244 \| good
2026-08-22T09:00:00.000Z	27 \| good	4.699 \| good	22.314 \| good	22.906 \| good	0.393 \| good	3.051 \| good	0.244 \| good
2026-08-22T10:00:00.000Z	21 \| good	3.455 \| good	10.97 \| good	22.952 \| good	0.537 \| good	2.314 \| good	0.11 \| good
2026-08-22T11:00:00.000Z	21 \| good	2.983 \| good	14.157 \| good	22.62 \| good	0.797 \| good	2.152 \| good	0.11 \| good
2026-08-22T12:00:00.000Z	18 \| good	3.288 \| good	12.611 \| good	19.216 \| good	0.316 \| good	4.114 \| good	0.27 \| good
2026-08-22T13:00:00.000Z	19 \| good	2.677 \| good	9.244 \| good	21.466 \| good	0.327 \| good	2.375 \| good	0.209 \| good
2026-08-22T14:00:00.000Z	22 \| good	3.945 \| good	16.843 \| good	21.163 \| good	0.343 \| good	3.275 \| good	0.209 \| good
2026-08-22T15:00:00.000Z	22 \| good	4.265 \| good	20.074 \| good	19.509 \| good	0.344 \| good	3.896 \| good	0.256 \| good
2026-08-22T16:00:00.000Z	33 \| good	5.585 \| good	21.563 \| good	21.628 \| good	0.389 \| good	3.335 \| good	0.261 \| good
2026-08-22T17:00:00.000Z	27 \| good	4.711 \| good	21.41 \| good	21.599 \| good	0.444 \| good	3.277 \| good	0.276 \| good
2026-08-22T18:00:00.000Z	22 \| good	3.696 \| good	17.518 \| good	20.817 \| good	0.432 \| good	3.039 \| good	0.258 \| good
2026-08-22T19:00:00.000Z	22 \| good	4.41 \| good	21.88 \| good	21.955 \| good	0.448 \| good	2.333 \| good	0.217 \| good
2026-08-22T20:00:00.000Z	21 \| good	3.258 \| good	10.788 \| good	22.817 \| good	0.488 \| good	2.395 \| good	0.233 \| good
2026-08-22T21:00:00.000Z	22 \| good	4.113 \| good	11.404 \| good	21.621 \| good	0.46 \| good	2.238 \| good	0.233 \| good
2026-08-22T22:00:00.000Z	20 \| good	3.201 \| good	10.804 \| good	21.945 \| good	0.51 \| good	2.571 \| good	0.233 \| good
2026-08-22T23:00:00.000Z	22 \| good	4.258 \| good	19.443 \| good	20.274 \| good	0.487 \| good	2.921 \| good	0.217 \| good
2026-08-23T00:00:00.000Z	22 \| good	4.176 \| good	15.673 \| good	21.459 \| good	0.494 \| good	3.075 \| good	0.274 \| good
2026-08-23T01:00:00.000Z	22 \| good	2.722 \| good	16.365 \| good	23.596 \| good	0.505 \| good	1.977 \| good	0.233 \| good
2026-08-23T02:00:00.000Z	25 \| good	3.119 \| good	13.807 \| good	27.236 \| good	0.46 \| good	1.637 \| good	0.327 \| good
2026-08-23T03:00:00.000Z	22 \| good	4.336 \| good	18.764 \| good	22.052 \| good	0.335 \| good	4.194 \| good	0.086 \| good
2026-08-23T04:00:00.000Z	29 \| good	2.161 \| good	14.041 \| good	30.527 \| good	0.459 \| good	3.931 \| good	0.233 \| good
2026-08-23T05:00:00.000Z	24 \| good	3.755 \| good	16.006 \| good	25.87 \| good	0.42 \| good	4.876 \| good	0.233 \| good
2026-08-23T06:00:00.000Z	27 \| good	3.338 \| good	19.328 \| good	28.649 \| good	0.46 \| good	4.09 \| good	0.233 \| good
2026-08-23T07:00:00.000Z	24 \| good	3.283 \| good	15.101 \| good	26.299 \| good	0.46 \| good	3.17 \| good	0.217 \| good
2026-08-23T08:00:00.000Z	22 \| good	3.627 \| good	15.854 \| good	19.942 \| good	0.477 \| good	2.679 \| good	0.263 \| good
2026-08-23T09:00:00.000Z	27 \| good	4.788 \| good	21.357 \| good	18.336 \| good	0.476 \| good	2.674 \| good	0.263 \| good
2026-08-23T10:00:00.000Z	27 \| good	5.042 \| good	22.898 \| good	18.152 \| good	0.554 \| good	4.261 \| good	0.11 \| good
2026-08-23T11:00:00.000Z	22 \| good	4.381 \| good	14.007 \| good	18.023 \| good	0.579 \| good	4.281 \| good	0.11 \| good
2026-08-23T12:00:00.000Z	33 \| good	6.317 \| good	13.67 \| good	18.823 \| good	0.356 \| good	4.785 \| good	0.285 \| good
2026-08-23T13:00:00.000Z	22 \| good	4.195 \| good	18.055 \| good	13.413 \| good	0.558 \| good	3.216 \| good	0.244 \| good
2026-08-23T14:00:00.000Z	22 \| good	4.067 \| good	15.434 \| good	12.071 \| good	0.465 \| good	3.83 \| good	0.244 \| good
2026-08-23T15:00:00.000Z	22 \| good	3.675 \| good	9.571 \| good	12.508 \| good	0.438 \| good	4.465 \| good	0.274 \| good
2026-08-23T16:00:00.000Z	22 \| good	4.279 \| good	16.714 \| good	15.562 \| good	0.46 \| good	4.261 \| good	0.244 \| good
2026-08-23T17:00:00.000Z	27 \| good	4.996 \| good	17.692 \| good	15.621 \| good	0.434 \| good	3.956 \| good	0.276 \| good
2026-08-23T18:00:00.000Z	33 \| good	6.013 \| good	28.028 \| good	16.473 \| good	0.672 \| good	3.608 \| good	0.295 \| good
2026-08-23T19:00:00.000Z	27 \| good	5.191 \| good	26.338 \| good	17.706 \| good	0.839 \| good	3.391 \| good	0.292 \| good
2026-08-23T20:00:00.000Z	22 \| good	3.893 \| good	11.291 \| good	21.333 \| good	1.176 \| good	3.73 \| good	0.285 \| good
2026-08-23T21:00:00.000Z	22 \| good	4.004 \| good	13.922 \| good	20.867 \| good	1.638 \| good	3.617 \| good	0.268 \| good
2026-08-23T22:00:00.000Z	33 \| good	6.443 \| good	25.312 \| good	22.367 \| good	1.387 \| good	3.153 \| good	0.251 \| good
2026-08-23T23:00:00.000Z	38 \| good	6.794 \| good	19.623 \| good	27.76 \| good	1.313 \| good	3.412 \| good	0.278 \| good
2026-08-24T00:00:00.000Z	33 \| good	5.532 \| good	25.369 \| good	27.642 \| good	1.105 \| good	3.425 \| good	0.295 \| good
2026-08-24T01:00:00.000Z	27 \| good	4.641 \| good	19.769 \| good	29.149 \| good	0.87 \| good	3.168 \| good	0.244 \| good
2026-08-24T01:00:00.000Z	27 \| good	4.641 \| good	19.769 \| good	29.149 \| good	0.87 \| good	3.168 \| good	0.244 \| good
2026-08-23T07:00:00.000Z	22 \| good	4.368 \| good	19.074 \| good	20.409 \| good	0.312 \| good	4.123 \| good	0.085 \| good
2026-08-23T08:00:00.000Z	22 \| good	3.831 \| good	16.675 \| good	19.274 \| good	0.309 \| good	3.495 \| good	0.084 \| good
2026-08-23T09:00:00.000Z	22 \| good	4.325 \| good	18.957 \| good	19.48 \| good	0.304 \| good	3.121 \| good	0.084 \| good
2026-08-23T10:00:00.000Z	27 \| good	4.587 \| good	20.004 \| good	19.378 \| good	0.301 \| good	2.769 \| good	0.083 \| good
2026-08-23T11:00:00.000Z	22 \| good	3.774 \| good	16.345 \| good	18.427 \| good	0.3 \| good	2.535 \| good	0.082 \| good
2026-08-23T12:00:00.000Z	18 \| good	2.481 \| good	10.126 \| good	19.407 \| good	0.293 \| good	2.691 \| good	0.083 \| good
2026-08-23T13:00:00.000Z	19 \| good	2.673 \| good	11.098 \| good	20.074 \| good	0.294 \| good	2.835 \| good	0.083 \| good
2026-08-23T14:00:00.000Z	18 \| good	3.098 \| good	12.772 \| good	18.572 \| good	0.302 \| good	2.747 \| good	0.083 \| good
2026-08-23T15:00:00.000Z	22 \| good	4.053 \| good	17.792 \| good	16.918 \| good	0.329 \| good	2.445 \| good	0.083 \| good
2026-08-23T16:00:00.000Z	27 \| good	5.088 \| good	21.751 \| good	18.087 \| good	0.351 \| good	2.217 \| good	0.083 \| good
2026-08-23T17:00:00.000Z	27 \| good	4.598 \| good	19.896 \| good	20.321 \| good	0.376 \| good	1.909 \| good	0.083 \| good
2026-08-23T18:00:00.000Z	21 \| good	3.044 \| good	12.606 \| good	23.412 \| good	0.406 \| good	1.583 \| good	0.082 \| good
2026-08-23T19:00:00.000Z	23 \| good	2.452 \| good	9.973 \| good	24.847 \| good	0.427 \| good	1.459 \| good	0.082 \| good
2026-08-23T20:00:00.000Z	22 \| good	2.464 \| good	10.109 \| good	23.665 \| good	0.438 \| good	1.352 \| good	0.081 \| good
2026-08-23T21:00:00.000Z	22 \| good	3.384 \| good	14.66 \| good	23.635 \| good	0.44 \| good	1.29 \| good	0.081 \| good
2026-08-23T22:00:00.000Z	27 \| good	4.551 \| good	19.764 \| good	24.787 \| good	0.426 \| good	1.359 \| good	0.08 \| good
2026-08-23T23:00:00.000Z	23 \| good	3.615 \| good	15.969 \| good	25.492 \| good	0.407 \| good	1.564 \| good	0.079 \| good
2026-08-24T00:00:00.000Z	27 \| good	4.786 \| good	20.821 \| good	24.043 \| good	0.392 \| good	1.909 \| good	0.078 \| good
2026-08-24T01:00:00.000Z	21 \| good	3.371 \| good	14.831 \| good	23.401 \| good	0.389 \| good	2.573 \| good	0.079 \| good
2026-08-24T02:00:00.000Z	21 \| good	2.25 \| good	9.188 \| good	23.055 \| good	0.377 \| good	3.452 \| good	0.081 \| good
2026-08-24T03:00:00.000Z	23 \| good	3.135 \| good	13.563 \| good	25.149 \| good	0.368 \| good	4.102 \| good	0.081 \| good
2026-08-24T04:00:00.000Z	23 \| good	2.51 \| good	10.193 \| good	24.774 \| good	0.366 \| good	4.082 \| good	0.081 \| good
2026-08-24T05:00:00.000Z	22 \| good	1.696 \| good	7.034 \| good	23.581 \| good	0.372 \| good	3.738 \| good	0.081 \| good
2026-08-24T06:00:00.000Z	20 \| good	1.797 \| good	7.332 \| good	22.088 \| good	0.366 \| good	3.575 \| good	0.081 \| good
2026-08-24T07:00:00.000Z	20 \| good	1.494 \| good	6.034 \| good	21.806 \| good	0.362 \| good	3.426 \| good	0.081 \| good
2026-08-24T08:00:00.000Z	21 \| good	1.607 \| good	6.587 \| good	23.13 \| good	0.354 \| good	3.304 \| good	0.081 \| good
2026-08-24T09:00:00.000Z	21 \| good	1.536 \| good	6.389 \| good	23.213 \| good	0.346 \| good	3.145 \| good	0.08 \| good
2026-08-24T10:00:00.000Z	22 \| good	2.019 \| good	8.17 \| good	23.628 \| good	0.335 \| good	2.979 \| good	0.08 \| good
2026-08-24T11:00:00.000Z	21 \| good	2.325 \| good	9.331 \| good	22.659 \| good	0.326 \| good	2.836 \| good	0.08 \| good
2026-08-24T12:00:00.000Z	20 \| good	1.398 \| good	5.445 \| good	21.992 \| good	0.325 \| good	2.62 \| good	0.079 \| good
2026-08-24T13:00:00.000Z	22 \| good	1.65 \| good	6.924 \| good	24.123 \| good	0.326 \| good	2.55 \| good	0.079 \| good
2026-08-24T14:00:00.000Z	21 \| good	1.405 \| good	5.499 \| good	22.851 \| good	0.327 \| good	2.501 \| good	0.08 \| good
2026-08-24T15:00:00.000Z	19 \| good	1.542 \| good	6.329 \| good	20.057 \| good	0.336 \| good	2.377 \| good	0.081 \| good
2026-08-24T16:00:00.000Z	19 \| good	3.343 \| good	14.412 \| good	21.466 \| good	0.342 \| good	2.234 \| good	0.082 \| good
2026-08-24T17:00:00.000Z	21 \| good	2.298 \| good	9.574 \| good	22.636 \| good	0.347 \| good	1.849 \| good	0.082 \| good
2026-08-24T18:00:00.000Z	23 \| good	1.823 \| good	7.578 \| good	24.653 \| good	0.352 \| good	1.535 \| good	0.082 \| good
2026-08-24T19:00:00.000Z	24 \| good	2.029 \| good	8.167 \| good	26.002 \| good	0.353 \| good	1.27 \| good	0.081 \| good
2026-08-24T20:00:00.000Z	24 \| good	2.112 \| good	8.559 \| good	26.001 \| good	0.358 \| good	1.074 \| good	0.081 \| good
2026-08-24T21:00:00.000Z	22 \| good	2.154 \| good	8.71 \| good	24.456 \| good	0.36 \| good	1.005 \| good	0.081 \| good
2026-08-24T22:00:00.000Z	23 \| good	2.735 \| good	11.278 \| good	25.307 \| good	0.358 \| good	1.022 \| good	0.082 \| good
2026-08-24T23:00:00.000Z	24 \| good	2.688 \| good	11 \| good	25.685 \| good	0.355 \| good	1.148 \| good	0.082 \| good
2026-08-25T00:00:00.000Z	22 \| good	3.068 \| good	12.788 \| good	24.415 \| good	0.348 \| good	1.334 \| good	0.083 \| good
2026-08-25T01:00:00.000Z	21 \| good	2.931 \| good	12.261 \| good	23.371 \| good	0.339 \| good	1.754 \| good	0.084 \| good
2026-08-25T02:00:00.000Z	22 \| good	2.658 \| good	10.846 \| good	23.831 \| good	0.328 \| good	2.312 \| good	0.085 \| good
2026-08-25T03:00:00.000Z	24 \| good	2.034 \| good	8.368 \| good	26.278 \| good	0.325 \| good	2.735 \| good	0.086 \| good
2026-08-25T04:00:00.000Z	24 \| good	2.198 \| good	9.078 \| good	25.559 \| good	0.332 \| good	2.768 \| good	0.086 \| good
2026-08-25T05:00:00.000Z	24 \| good	1.692 \| good	6.972 \| good	25.912 \| good	0.34 \| good	2.688 \| good	0.086 \| good
2026-08-25T06:00:00.000Z	49 \| good	8.851 \| good	12.843 \| good	26.378 \| good	0.351 \| good	2.761 \| good	0.087 \| 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?