What is the current level of PM10 in Signal Hill, California?

Signal Hill, California currently has a PM10 concentration of 41.127 μg/m3.

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

The current sulfur dioxide (SO2) concentration in Signal Hill, California is 0.361 ppb.

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

Signal Hill, California currently has an ozone (O3) concentration of 30.835 ppm.

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

The current level of nitrogen dioxide (NO2) in Signal Hill, California is 1.084 ppb.

Current air quality index in Signal Hill, California today

Name: Live air pollution levels in Signal Hill, California today
Creator: Ambee

Stay updated with real-time air quality in Signal Hill, 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

Signal Hill, California

Last updated: ... (Local time)

Common air pollutants in Signal Hill, California

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

5.62 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

41.13 μg/m³

155

255

425

605+

Ozone (O₃)

30.84 ppb

201

201+

Sulfur Dioxide (SO₂)

0.36 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

1.08 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.16 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

High

Signal Hill, California

Get Live Pollen Counts

Signal Hill, California

Scroll To Air Quality Map

Track live Signal Hill, California air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-09-08T20:00:00.000Z	44 \| good	8.021 \| good	38.501 \| good	27.801 \| good	0.594 \| good	11.168 \| good	0.226 \| good
2025-09-08T21:00:00.000Z	44 \| good	8.363 \| good	35.511 \| good	35.281 \| good	0.587 \| good	7.94 \| good	0.168 \| good
2025-09-08T22:00:00.000Z	44 \| good	8.341 \| good	33.544 \| good	35.988 \| good	0.586 \| good	6.925 \| good	0.182 \| good
2025-09-08T23:00:00.000Z	38 \| good	6.905 \| good	32.511 \| good	35.89 \| good	1.741 \| good	7.204 \| good	0.168 \| good
2025-09-09T00:00:00.000Z	33 \| good	6.313 \| good	28.076 \| good	32.404 \| good	2.921 \| good	6.218 \| good	0.119 \| good
2025-09-09T01:00:00.000Z	26 \| good	4.232 \| good	18.71 \| good	28.15 \| good	2.81 \| good	8.232 \| good	0.122 \| good
2025-09-09T02:00:00.000Z	24 \| good	3.889 \| good	17.182 \| good	26.289 \| good	2.321 \| good	9.061 \| good	0.124 \| good
2025-09-09T03:00:00.000Z	24 \| good	4.287 \| good	18.673 \| good	25.916 \| good	2.29 \| good	11.249 \| good	0.13 \| good
2025-09-09T04:00:00.000Z	27 \| good	5.153 \| good	22.08 \| good	23.566 \| good	2.657 \| good	13.672 \| good	0.136 \| good
2025-09-09T05:00:00.000Z	19 \| good	2.507 \| good	10.193 \| good	21.213 \| good	2.727 \| good	15.086 \| good	0.143 \| good
2025-09-09T06:00:00.000Z	27 \| good	4.949 \| good	21.44 \| good	19.744 \| good	2.797 \| good	16.5 \| good	0.149 \| good
2025-09-09T07:00:00.000Z	16 \| good	1.604 \| good	6.529 \| good	16.529 \| good	2.616 \| good	16.097 \| good	0.16 \| good
2025-09-09T08:00:00.000Z	22 \| good	3.988 \| good	15.938 \| good	13.717 \| good	0.248 \| good	2.538 \| good	0.182 \| good
2025-09-09T09:00:00.000Z	16 \| good	2.96 \| good	10.41 \| good	13.781 \| good	0.212 \| good	4.765 \| good	0.157 \| good
2025-09-09T10:00:00.000Z	16 \| good	2.969 \| good	10.481 \| good	13.787 \| good	0.184 \| good	4.765 \| good	0.157 \| good
2025-09-09T11:00:00.000Z	16 \| good	2.704 \| good	9.479 \| good	10.806 \| good	0.221 \| good	6.904 \| good	0.159 \| good
2025-09-09T12:00:00.000Z	16 \| good	3.226 \| good	10.31 \| good	8.915 \| good	0.175 \| good	6.191 \| good	0.143 \| good
2025-09-09T13:00:00.000Z	16 \| good	2.729 \| good	10.144 \| good	8.911 \| good	0.217 \| good	7.697 \| good	0.13 \| good
2025-09-09T14:00:00.000Z	16 \| good	2.835 \| good	10.13 \| good	10.031 \| good	0.394 \| good	9.06 \| good	0.142 \| good
2025-09-09T15:00:00.000Z	22 \| good	3.698 \| good	14.188 \| good	11.106 \| good	0.453 \| good	12.258 \| good	0.114 \| good
2025-09-09T16:00:00.000Z	27 \| good	4.992 \| good	15.252 \| good	14.089 \| good	0.638 \| good	4.968 \| good	0.114 \| good
2025-09-09T17:00:00.000Z	27 \| good	5.084 \| good	14.264 \| good	17.134 \| good	0.664 \| good	2.312 \| good	0.137 \| good
2025-09-09T18:00:00.000Z	22 \| good	4.44 \| good	15.145 \| good	21.798 \| good	0.313 \| good	1.887 \| good	0.114 \| good
2025-09-09T19:00:00.000Z	26 \| good	4.426 \| good	13.62 \| good	27.935 \| good	0.243 \| good	1.307 \| good	0.114 \| good
2025-09-09T20:00:00.000Z	28 \| good	4.921 \| good	13.717 \| good	29.962 \| good	0.186 \| good	1.527 \| good	0.129 \| good
2025-09-09T21:00:00.000Z	33 \| good	5.59 \| good	18.476 \| good	29.949 \| good	0.244 \| good	2.806 \| good	0.142 \| good
2025-09-09T22:00:00.000Z	33 \| good	5.863 \| good	22.621 \| good	30.032 \| good	0.103 \| good	4.862 \| good	0.128 \| good
2025-09-09T23:00:00.000Z	27 \| good	5.017 \| good	18.372 \| good	29.09 \| good	0.101 \| good	3.857 \| good	0.129 \| good
2025-09-10T00:00:00.000Z	27 \| good	5.166 \| good	15.322 \| good	28.047 \| good	0.101 \| good	3.414 \| good	0.2 \| good
2025-09-10T01:00:00.000Z	27 \| good	4.869 \| good	18.083 \| good	25.19 \| good	0.203 \| good	4.379 \| good	0.199 \| good
2025-09-10T02:00:00.000Z	33 \| good	6.434 \| good	22.638 \| good	24.232 \| good	0.296 \| good	5.355 \| good	0.199 \| good
2025-09-10T03:00:00.000Z	44 \| good	8.253 \| good	22.24 \| good	21.284 \| good	0.297 \| good	6.212 \| good	0.198 \| good
2025-09-10T04:00:00.000Z	44 \| good	7.725 \| good	22.432 \| good	19.073 \| good	0.395 \| good	6.161 \| good	0.174 \| good
2025-09-10T05:00:00.000Z	54 \| moderate	10.595 \| good	30.653 \| good	14.336 \| good	0.788 \| good	8.772 \| good	0.195 \| good
2025-09-10T06:00:00.000Z	49 \| good	9.303 \| good	26.174 \| good	14.218 \| good	0.106 \| good	6.546 \| good	0.215 \| good
2025-09-10T07:00:00.000Z	44 \| good	8.201 \| good	21.086 \| good	18.07 \| good	0.104 \| good	6.381 \| good	0.195 \| good
2025-09-10T08:00:00.000Z	38 \| good	6.912 \| good	18.397 \| good	20.81 \| good	0.294 \| good	4.545 \| good	0.178 \| good
2025-09-10T09:00:00.000Z	33 \| good	5.517 \| good	15.048 \| good	18.876 \| good	0.258 \| good	6.257 \| good	0.118 \| good
2025-09-10T10:00:00.000Z	27 \| good	4.945 \| good	14.082 \| good	19.653 \| good	0.364 \| good	5.034 \| good	0.118 \| good
2025-09-10T11:00:00.000Z	27 \| good	4.671 \| good	12.748 \| good	20.715 \| good	0.234 \| good	3.107 \| good	0.12 \| good
2025-09-10T12:00:00.000Z	22 \| good	3.903 \| good	10.447 \| good	20.814 \| good	0.293 \| good	1.605 \| good	0.139 \| good
2025-09-10T13:00:00.000Z	22 \| good	4.411 \| good	10.09 \| good	19.865 \| good	0.256 \| good	4.449 \| good	0.159 \| good
2025-09-10T14:00:00.000Z	27 \| good	4.91 \| good	9.814 \| good	17.997 \| good	0.436 \| good	7.506 \| good	0.166 \| good
2025-09-10T15:00:00.000Z	33 \| good	5.595 \| good	13.051 \| good	22.782 \| good	0.292 \| good	5.527 \| good	0.196 \| good
2025-09-10T16:00:00.000Z	33 \| good	5.883 \| good	19.405 \| good	24.872 \| good	0.334 \| good	2.883 \| good	0.14 \| good
2025-09-10T17:00:00.000Z	33 \| good	5.612 \| good	21.79 \| good	27.745 \| good	0.366 \| good	1.752 \| good	0.14 \| good
2025-09-10T18:00:00.000Z	39 \| good	4.971 \| good	42.47 \| good	29.936 \| good	0.359 \| good	1.643 \| good	0.126 \| good
2025-09-10T19:00:00.000Z	38 \| good	5.622 \| good	41.127 \| good	30.835 \| good	0.361 \| good	1.084 \| good	0.156 \| good
2025-09-10T19:00:00.000Z	38 \| good	5.622 \| good	41.127 \| good	30.835 \| good	0.361 \| good	1.084 \| good	0.156 \| good
2025-09-10T20:00:00.000Z	34 \| good	3.89 \| good	16.906 \| good	36.942 \| good	1.967 \| good	3.51 \| good	0.109 \| good
2025-09-10T21:00:00.000Z	34 \| good	3.581 \| good	15.522 \| good	37.215 \| good	1.969 \| good	3.075 \| good	0.108 \| good
2025-09-10T22:00:00.000Z	34 \| good	4.054 \| good	17.621 \| good	37.328 \| good	1.998 \| good	3.29 \| good	0.108 \| good
2025-09-10T23:00:00.000Z	36 \| good	5.56 \| good	24.137 \| good	39.005 \| good	2.028 \| good	3.506 \| good	0.108 \| good
2025-09-11T00:00:00.000Z	36 \| good	6.402 \| good	28.712 \| good	39.3 \| good	2.057 \| good	3.721 \| good	0.107 \| good
2025-09-11T01:00:00.000Z	33 \| good	4.092 \| good	17.872 \| good	36.051 \| good	2.199 \| good	5.398 \| good	0.11 \| good
2025-09-11T02:00:00.000Z	26 \| good	2.986 \| good	12.595 \| good	27.754 \| good	2.34 \| good	7.076 \| good	0.113 \| good
2025-09-11T03:00:00.000Z	22 \| good	1.733 \| good	7.042 \| good	24.361 \| good	2.481 \| good	8.753 \| good	0.115 \| good
2025-09-11T04:00:00.000Z	22 \| good	3.804 \| good	16.392 \| good	21.338 \| good	2.679 \| good	10.29 \| good	0.119 \| good
2025-09-11T05:00:00.000Z	19 \| good	2.367 \| good	9.459 \| good	20.708 \| good	2.878 \| good	11.827 \| good	0.122 \| good
2025-09-11T06:00:00.000Z	18 \| good	2.216 \| good	8.964 \| good	18.744 \| good	3.076 \| good	13.364 \| good	0.125 \| good
2025-09-11T07:00:00.000Z	18 \| good	0.551 \| good	2.042 \| good	19.297 \| good	3.141 \| good	13.865 \| good	0.126 \| good
2025-09-11T08:00:00.000Z	18 \| good	0.569 \| good	2.106 \| good	18.638 \| good	3.207 \| good	14.365 \| good	0.127 \| good
2025-09-11T09:00:00.000Z	16 \| good	3.103 \| good	13.168 \| good	16.678 \| good	3.272 \| good	14.865 \| good	0.128 \| good
2025-09-11T10:00:00.000Z	14 \| good	1.718 \| good	7.169 \| good	15.028 \| good	3.552 \| good	15.048 \| good	0.127 \| good
2025-09-11T11:00:00.000Z	14 \| good	1.709 \| good	6.993 \| good	13.111 \| good	3.831 \| good	15.232 \| good	0.126 \| good
2025-09-11T12:00:00.000Z	22 \| good	4.05 \| good	17.802 \| good	10.496 \| good	4.111 \| good	15.415 \| good	0.124 \| good
2025-09-11T13:00:00.000Z	27 \| good	5.036 \| good	21.722 \| good	9.521 \| good	4.27 \| good	14.437 \| good	0.132 \| good
2025-09-11T14:00:00.000Z	16 \| good	2.92 \| good	12.408 \| good	11.202 \| good	4.429 \| good	13.46 \| good	0.139 \| good
2025-09-11T15:00:00.000Z	27 \| good	5.358 \| good	23.265 \| good	16.043 \| good	4.589 \| good	12.482 \| good	0.147 \| good
2025-09-11T16:00:00.000Z	27 \| good	4.99 \| good	21.636 \| good	19.575 \| good	4.234 \| good	10.481 \| good	0.138 \| good
2025-09-11T17:00:00.000Z	27 \| good	4.941 \| good	21.429 \| good	23.908 \| good	3.88 \| good	8.48 \| good	0.13 \| good
2025-09-11T18:00:00.000Z	27 \| good	4.985 \| good	21.827 \| good	28.85 \| good	3.526 \| good	6.478 \| good	0.121 \| good
2025-09-11T19:00:00.000Z	31 \| good	2.353 \| good	9.833 \| good	33.126 \| good	3.342 \| good	5.76 \| good	0.119 \| good
2025-09-11T20:00:00.000Z	33 \| good	2.815 \| good	11.523 \| good	36.357 \| good	3.159 \| good	5.041 \| good	0.117 \| good
2025-09-11T21:00:00.000Z	34 \| good	3.338 \| good	14.4 \| good	37.179 \| good	2.975 \| good	4.323 \| good	0.114 \| good
2025-09-11T22:00:00.000Z	33 \| good	4.168 \| good	18.046 \| good	36.201 \| good	2.918 \| good	4.442 \| good	0.115 \| good
2025-09-11T23:00:00.000Z	33 \| good	3.852 \| good	16.768 \| good	35.673 \| good	2.861 \| good	4.561 \| good	0.116 \| good
2025-09-12T00:00:00.000Z	31 \| good	4.029 \| good	17.611 \| good	34.261 \| good	2.804 \| good	4.68 \| good	0.117 \| good
2025-09-12T01:00:00.000Z	28 \| good	2.555 \| good	10.369 \| good	29.972 \| good	2.898 \| good	6.656 \| good	0.123 \| good
2025-09-12T02:00:00.000Z	26 \| good	2.269 \| good	9.314 \| good	28.155 \| good	2.992 \| good	8.632 \| good	0.13 \| good
2025-09-12T03:00:00.000Z	23 \| good	2.432 \| good	9.905 \| good	24.99 \| good	3.087 \| good	10.608 \| good	0.136 \| good
2025-09-12T04:00:00.000Z	22 \| good	4.316 \| good	19.095 \| good	21.95 \| good	3.324 \| good	12.856 \| good	0.143 \| good
2025-09-12T05:00:00.000Z	22 \| good	4.171 \| good	18.194 \| good	20.264 \| good	3.561 \| good	15.103 \| good	0.15 \| good
2025-09-12T06:00:00.000Z	22 \| good	4.41 \| good	19.071 \| good	19.359 \| good	3.798 \| good	17.35 \| good	0.157 \| good
2025-09-12T07:00:00.000Z	17 \| good	3.404 \| good	15.027 \| good	17.942 \| good	3.782 \| good	17.877 \| good	0.161 \| good
2025-09-12T08:00:00.000Z	17 \| good	3.042 \| good	13.218 \| good	15.32 \| good	3.766 \| good	18.404 \| good	0.165 \| good
2025-09-12T09:00:00.000Z	22 \| good	3.746 \| good	16.477 \| good	15.314 \| good	3.75 \| good	18.932 \| good	0.169 \| good
2025-09-12T10:00:00.000Z	18 \| good	3.253 \| good	13.871 \| good	13.009 \| good	3.674 \| good	18.628 \| good	0.168 \| good
2025-09-12T11:00:00.000Z	17 \| good	2.688 \| good	11.254 \| good	13.063 \| good	3.598 \| good	18.325 \| good	0.168 \| good
2025-09-12T12:00:00.000Z	17 \| good	0.66 \| good	2.542 \| good	16.152 \| good	3.522 \| good	18.022 \| good	0.167 \| good
2025-09-12T13:00:00.000Z	16 \| good	1.06 \| good	4.224 \| good	16.335 \| good	3.438 \| good	17.12 \| good	0.184 \| good
2025-09-12T14:00:00.000Z	16 \| good	1.876 \| good	7.828 \| good	17.265 \| good	3.354 \| good	16.218 \| good	0.201 \| good
2025-09-12T15:00:00.000Z	18 \| good	3.03 \| good	12.204 \| good	19.138 \| good	3.271 \| good	15.316 \| good	0.217 \| good
2025-09-12T16:00:00.000Z	22 \| good	4.244 \| good	18.329 \| good	21.292 \| good	3.177 \| good	12.28 \| good	0.19 \| good
2025-09-12T17:00:00.000Z	33 \| good	6.302 \| good	28.04 \| good	25.572 \| good	3.083 \| good	9.244 \| good	0.162 \| good
2025-09-12T18:00:00.000Z	30 \| good	5.271 \| good	22.902 \| good	31.75 \| good	2.989 \| good	6.208 \| good	0.135 \| good
2025-09-12T19:00:00.000Z	33 \| good	5.542 \| good	23.868 \| good	36.385 \| good	2.908 \| good	5.512 \| good	0.132 \| good

Signal Hill

Empower business decisions with accurate air quality data

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

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 Signal Hill, California get updated?

Air quality updates for Signal Hill, California are available every hour.

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

Signal Hill, California experienced its worst air quality at 05:00:00, 2025-09-10.

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

The best air quality in Signal Hill, California was observed at 01:00:00 on 2025-09-10.

What is the air quality in Signal Hill, California right now?

The air quality in Signal Hill, California right now is Good, with an AQI of 38.

What pollutant is most frequently found in Signal Hill, California?

In Signal Hill, California, PM10 is the most frequently found pollutant.

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

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

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

Signal Hill, California currently has a PM_2.5 concentration of 5.622 μg/m³.

What is the current level of PM₁₀ in Signal Hill, California?

Signal Hill, California currently has a PM₁₀ concentration of 41.127 μg/m³.

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

The current carbon monoxide (CO) level in Signal Hill, California is 0.156 ppm.

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

The current sulfur dioxide (SO₂) concentration in Signal Hill, California is 0.361 ppb.

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

Signal Hill, California currently has an ozone (O₃) concentration of 30.835 ppm.

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

The current level of nitrogen dioxide (NO₂) in Signal Hill, California is 1.084 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-09-08T20:00:00.000Z	44 \| good	8.021 \| good	38.501 \| good	27.801 \| good	0.594 \| good	11.168 \| good	0.226 \| good
2025-09-08T21:00:00.000Z	44 \| good	8.363 \| good	35.511 \| good	35.281 \| good	0.587 \| good	7.94 \| good	0.168 \| good
2025-09-08T22:00:00.000Z	44 \| good	8.341 \| good	33.544 \| good	35.988 \| good	0.586 \| good	6.925 \| good	0.182 \| good
2025-09-08T23:00:00.000Z	38 \| good	6.905 \| good	32.511 \| good	35.89 \| good	1.741 \| good	7.204 \| good	0.168 \| good
2025-09-09T00:00:00.000Z	33 \| good	6.313 \| good	28.076 \| good	32.404 \| good	2.921 \| good	6.218 \| good	0.119 \| good
2025-09-09T01:00:00.000Z	26 \| good	4.232 \| good	18.71 \| good	28.15 \| good	2.81 \| good	8.232 \| good	0.122 \| good
2025-09-09T02:00:00.000Z	24 \| good	3.889 \| good	17.182 \| good	26.289 \| good	2.321 \| good	9.061 \| good	0.124 \| good
2025-09-09T03:00:00.000Z	24 \| good	4.287 \| good	18.673 \| good	25.916 \| good	2.29 \| good	11.249 \| good	0.13 \| good
2025-09-09T04:00:00.000Z	27 \| good	5.153 \| good	22.08 \| good	23.566 \| good	2.657 \| good	13.672 \| good	0.136 \| good
2025-09-09T05:00:00.000Z	19 \| good	2.507 \| good	10.193 \| good	21.213 \| good	2.727 \| good	15.086 \| good	0.143 \| good
2025-09-09T06:00:00.000Z	27 \| good	4.949 \| good	21.44 \| good	19.744 \| good	2.797 \| good	16.5 \| good	0.149 \| good
2025-09-09T07:00:00.000Z	16 \| good	1.604 \| good	6.529 \| good	16.529 \| good	2.616 \| good	16.097 \| good	0.16 \| good
2025-09-09T08:00:00.000Z	22 \| good	3.988 \| good	15.938 \| good	13.717 \| good	0.248 \| good	2.538 \| good	0.182 \| good
2025-09-09T09:00:00.000Z	16 \| good	2.96 \| good	10.41 \| good	13.781 \| good	0.212 \| good	4.765 \| good	0.157 \| good
2025-09-09T10:00:00.000Z	16 \| good	2.969 \| good	10.481 \| good	13.787 \| good	0.184 \| good	4.765 \| good	0.157 \| good
2025-09-09T11:00:00.000Z	16 \| good	2.704 \| good	9.479 \| good	10.806 \| good	0.221 \| good	6.904 \| good	0.159 \| good
2025-09-09T12:00:00.000Z	16 \| good	3.226 \| good	10.31 \| good	8.915 \| good	0.175 \| good	6.191 \| good	0.143 \| good
2025-09-09T13:00:00.000Z	16 \| good	2.729 \| good	10.144 \| good	8.911 \| good	0.217 \| good	7.697 \| good	0.13 \| good
2025-09-09T14:00:00.000Z	16 \| good	2.835 \| good	10.13 \| good	10.031 \| good	0.394 \| good	9.06 \| good	0.142 \| good
2025-09-09T15:00:00.000Z	22 \| good	3.698 \| good	14.188 \| good	11.106 \| good	0.453 \| good	12.258 \| good	0.114 \| good
2025-09-09T16:00:00.000Z	27 \| good	4.992 \| good	15.252 \| good	14.089 \| good	0.638 \| good	4.968 \| good	0.114 \| good
2025-09-09T17:00:00.000Z	27 \| good	5.084 \| good	14.264 \| good	17.134 \| good	0.664 \| good	2.312 \| good	0.137 \| good
2025-09-09T18:00:00.000Z	22 \| good	4.44 \| good	15.145 \| good	21.798 \| good	0.313 \| good	1.887 \| good	0.114 \| good
2025-09-09T19:00:00.000Z	26 \| good	4.426 \| good	13.62 \| good	27.935 \| good	0.243 \| good	1.307 \| good	0.114 \| good
2025-09-09T20:00:00.000Z	28 \| good	4.921 \| good	13.717 \| good	29.962 \| good	0.186 \| good	1.527 \| good	0.129 \| good
2025-09-09T21:00:00.000Z	33 \| good	5.59 \| good	18.476 \| good	29.949 \| good	0.244 \| good	2.806 \| good	0.142 \| good
2025-09-09T22:00:00.000Z	33 \| good	5.863 \| good	22.621 \| good	30.032 \| good	0.103 \| good	4.862 \| good	0.128 \| good
2025-09-09T23:00:00.000Z	27 \| good	5.017 \| good	18.372 \| good	29.09 \| good	0.101 \| good	3.857 \| good	0.129 \| good
2025-09-10T00:00:00.000Z	27 \| good	5.166 \| good	15.322 \| good	28.047 \| good	0.101 \| good	3.414 \| good	0.2 \| good
2025-09-10T01:00:00.000Z	27 \| good	4.869 \| good	18.083 \| good	25.19 \| good	0.203 \| good	4.379 \| good	0.199 \| good
2025-09-10T02:00:00.000Z	33 \| good	6.434 \| good	22.638 \| good	24.232 \| good	0.296 \| good	5.355 \| good	0.199 \| good
2025-09-10T03:00:00.000Z	44 \| good	8.253 \| good	22.24 \| good	21.284 \| good	0.297 \| good	6.212 \| good	0.198 \| good
2025-09-10T04:00:00.000Z	44 \| good	7.725 \| good	22.432 \| good	19.073 \| good	0.395 \| good	6.161 \| good	0.174 \| good
2025-09-10T05:00:00.000Z	54 \| moderate	10.595 \| good	30.653 \| good	14.336 \| good	0.788 \| good	8.772 \| good	0.195 \| good
2025-09-10T06:00:00.000Z	49 \| good	9.303 \| good	26.174 \| good	14.218 \| good	0.106 \| good	6.546 \| good	0.215 \| good
2025-09-10T07:00:00.000Z	44 \| good	8.201 \| good	21.086 \| good	18.07 \| good	0.104 \| good	6.381 \| good	0.195 \| good
2025-09-10T08:00:00.000Z	38 \| good	6.912 \| good	18.397 \| good	20.81 \| good	0.294 \| good	4.545 \| good	0.178 \| good
2025-09-10T09:00:00.000Z	33 \| good	5.517 \| good	15.048 \| good	18.876 \| good	0.258 \| good	6.257 \| good	0.118 \| good
2025-09-10T10:00:00.000Z	27 \| good	4.945 \| good	14.082 \| good	19.653 \| good	0.364 \| good	5.034 \| good	0.118 \| good
2025-09-10T11:00:00.000Z	27 \| good	4.671 \| good	12.748 \| good	20.715 \| good	0.234 \| good	3.107 \| good	0.12 \| good
2025-09-10T12:00:00.000Z	22 \| good	3.903 \| good	10.447 \| good	20.814 \| good	0.293 \| good	1.605 \| good	0.139 \| good
2025-09-10T13:00:00.000Z	22 \| good	4.411 \| good	10.09 \| good	19.865 \| good	0.256 \| good	4.449 \| good	0.159 \| good
2025-09-10T14:00:00.000Z	27 \| good	4.91 \| good	9.814 \| good	17.997 \| good	0.436 \| good	7.506 \| good	0.166 \| good
2025-09-10T15:00:00.000Z	33 \| good	5.595 \| good	13.051 \| good	22.782 \| good	0.292 \| good	5.527 \| good	0.196 \| good
2025-09-10T16:00:00.000Z	33 \| good	5.883 \| good	19.405 \| good	24.872 \| good	0.334 \| good	2.883 \| good	0.14 \| good
2025-09-10T17:00:00.000Z	33 \| good	5.612 \| good	21.79 \| good	27.745 \| good	0.366 \| good	1.752 \| good	0.14 \| good
2025-09-10T18:00:00.000Z	39 \| good	4.971 \| good	42.47 \| good	29.936 \| good	0.359 \| good	1.643 \| good	0.126 \| good
2025-09-10T19:00:00.000Z	38 \| good	5.622 \| good	41.127 \| good	30.835 \| good	0.361 \| good	1.084 \| good	0.156 \| good
2025-09-10T19:00:00.000Z	38 \| good	5.622 \| good	41.127 \| good	30.835 \| good	0.361 \| good	1.084 \| good	0.156 \| good
2025-09-10T20:00:00.000Z	34 \| good	3.89 \| good	16.906 \| good	36.942 \| good	1.967 \| good	3.51 \| good	0.109 \| good
2025-09-10T21:00:00.000Z	34 \| good	3.581 \| good	15.522 \| good	37.215 \| good	1.969 \| good	3.075 \| good	0.108 \| good
2025-09-10T22:00:00.000Z	34 \| good	4.054 \| good	17.621 \| good	37.328 \| good	1.998 \| good	3.29 \| good	0.108 \| good
2025-09-10T23:00:00.000Z	36 \| good	5.56 \| good	24.137 \| good	39.005 \| good	2.028 \| good	3.506 \| good	0.108 \| good
2025-09-11T00:00:00.000Z	36 \| good	6.402 \| good	28.712 \| good	39.3 \| good	2.057 \| good	3.721 \| good	0.107 \| good
2025-09-11T01:00:00.000Z	33 \| good	4.092 \| good	17.872 \| good	36.051 \| good	2.199 \| good	5.398 \| good	0.11 \| good
2025-09-11T02:00:00.000Z	26 \| good	2.986 \| good	12.595 \| good	27.754 \| good	2.34 \| good	7.076 \| good	0.113 \| good
2025-09-11T03:00:00.000Z	22 \| good	1.733 \| good	7.042 \| good	24.361 \| good	2.481 \| good	8.753 \| good	0.115 \| good
2025-09-11T04:00:00.000Z	22 \| good	3.804 \| good	16.392 \| good	21.338 \| good	2.679 \| good	10.29 \| good	0.119 \| good
2025-09-11T05:00:00.000Z	19 \| good	2.367 \| good	9.459 \| good	20.708 \| good	2.878 \| good	11.827 \| good	0.122 \| good
2025-09-11T06:00:00.000Z	18 \| good	2.216 \| good	8.964 \| good	18.744 \| good	3.076 \| good	13.364 \| good	0.125 \| good
2025-09-11T07:00:00.000Z	18 \| good	0.551 \| good	2.042 \| good	19.297 \| good	3.141 \| good	13.865 \| good	0.126 \| good
2025-09-11T08:00:00.000Z	18 \| good	0.569 \| good	2.106 \| good	18.638 \| good	3.207 \| good	14.365 \| good	0.127 \| good
2025-09-11T09:00:00.000Z	16 \| good	3.103 \| good	13.168 \| good	16.678 \| good	3.272 \| good	14.865 \| good	0.128 \| good
2025-09-11T10:00:00.000Z	14 \| good	1.718 \| good	7.169 \| good	15.028 \| good	3.552 \| good	15.048 \| good	0.127 \| good
2025-09-11T11:00:00.000Z	14 \| good	1.709 \| good	6.993 \| good	13.111 \| good	3.831 \| good	15.232 \| good	0.126 \| good
2025-09-11T12:00:00.000Z	22 \| good	4.05 \| good	17.802 \| good	10.496 \| good	4.111 \| good	15.415 \| good	0.124 \| good
2025-09-11T13:00:00.000Z	27 \| good	5.036 \| good	21.722 \| good	9.521 \| good	4.27 \| good	14.437 \| good	0.132 \| good
2025-09-11T14:00:00.000Z	16 \| good	2.92 \| good	12.408 \| good	11.202 \| good	4.429 \| good	13.46 \| good	0.139 \| good
2025-09-11T15:00:00.000Z	27 \| good	5.358 \| good	23.265 \| good	16.043 \| good	4.589 \| good	12.482 \| good	0.147 \| good
2025-09-11T16:00:00.000Z	27 \| good	4.99 \| good	21.636 \| good	19.575 \| good	4.234 \| good	10.481 \| good	0.138 \| good
2025-09-11T17:00:00.000Z	27 \| good	4.941 \| good	21.429 \| good	23.908 \| good	3.88 \| good	8.48 \| good	0.13 \| good
2025-09-11T18:00:00.000Z	27 \| good	4.985 \| good	21.827 \| good	28.85 \| good	3.526 \| good	6.478 \| good	0.121 \| good
2025-09-11T19:00:00.000Z	31 \| good	2.353 \| good	9.833 \| good	33.126 \| good	3.342 \| good	5.76 \| good	0.119 \| good
2025-09-11T20:00:00.000Z	33 \| good	2.815 \| good	11.523 \| good	36.357 \| good	3.159 \| good	5.041 \| good	0.117 \| good
2025-09-11T21:00:00.000Z	34 \| good	3.338 \| good	14.4 \| good	37.179 \| good	2.975 \| good	4.323 \| good	0.114 \| good
2025-09-11T22:00:00.000Z	33 \| good	4.168 \| good	18.046 \| good	36.201 \| good	2.918 \| good	4.442 \| good	0.115 \| good
2025-09-11T23:00:00.000Z	33 \| good	3.852 \| good	16.768 \| good	35.673 \| good	2.861 \| good	4.561 \| good	0.116 \| good
2025-09-12T00:00:00.000Z	31 \| good	4.029 \| good	17.611 \| good	34.261 \| good	2.804 \| good	4.68 \| good	0.117 \| good
2025-09-12T01:00:00.000Z	28 \| good	2.555 \| good	10.369 \| good	29.972 \| good	2.898 \| good	6.656 \| good	0.123 \| good
2025-09-12T02:00:00.000Z	26 \| good	2.269 \| good	9.314 \| good	28.155 \| good	2.992 \| good	8.632 \| good	0.13 \| good
2025-09-12T03:00:00.000Z	23 \| good	2.432 \| good	9.905 \| good	24.99 \| good	3.087 \| good	10.608 \| good	0.136 \| good
2025-09-12T04:00:00.000Z	22 \| good	4.316 \| good	19.095 \| good	21.95 \| good	3.324 \| good	12.856 \| good	0.143 \| good
2025-09-12T05:00:00.000Z	22 \| good	4.171 \| good	18.194 \| good	20.264 \| good	3.561 \| good	15.103 \| good	0.15 \| good
2025-09-12T06:00:00.000Z	22 \| good	4.41 \| good	19.071 \| good	19.359 \| good	3.798 \| good	17.35 \| good	0.157 \| good
2025-09-12T07:00:00.000Z	17 \| good	3.404 \| good	15.027 \| good	17.942 \| good	3.782 \| good	17.877 \| good	0.161 \| good
2025-09-12T08:00:00.000Z	17 \| good	3.042 \| good	13.218 \| good	15.32 \| good	3.766 \| good	18.404 \| good	0.165 \| good
2025-09-12T09:00:00.000Z	22 \| good	3.746 \| good	16.477 \| good	15.314 \| good	3.75 \| good	18.932 \| good	0.169 \| good
2025-09-12T10:00:00.000Z	18 \| good	3.253 \| good	13.871 \| good	13.009 \| good	3.674 \| good	18.628 \| good	0.168 \| good
2025-09-12T11:00:00.000Z	17 \| good	2.688 \| good	11.254 \| good	13.063 \| good	3.598 \| good	18.325 \| good	0.168 \| good
2025-09-12T12:00:00.000Z	17 \| good	0.66 \| good	2.542 \| good	16.152 \| good	3.522 \| good	18.022 \| good	0.167 \| good
2025-09-12T13:00:00.000Z	16 \| good	1.06 \| good	4.224 \| good	16.335 \| good	3.438 \| good	17.12 \| good	0.184 \| good
2025-09-12T14:00:00.000Z	16 \| good	1.876 \| good	7.828 \| good	17.265 \| good	3.354 \| good	16.218 \| good	0.201 \| good
2025-09-12T15:00:00.000Z	18 \| good	3.03 \| good	12.204 \| good	19.138 \| good	3.271 \| good	15.316 \| good	0.217 \| good
2025-09-12T16:00:00.000Z	22 \| good	4.244 \| good	18.329 \| good	21.292 \| good	3.177 \| good	12.28 \| good	0.19 \| good
2025-09-12T17:00:00.000Z	33 \| good	6.302 \| good	28.04 \| good	25.572 \| good	3.083 \| good	9.244 \| good	0.162 \| good
2025-09-12T18:00:00.000Z	30 \| good	5.271 \| good	22.902 \| good	31.75 \| good	2.989 \| good	6.208 \| good	0.135 \| good
2025-09-12T19:00:00.000Z	33 \| good	5.542 \| good	23.868 \| good	36.385 \| good	2.908 \| good	5.512 \| good	0.132 \| good

Current air quality index in Signal Hill, California today

Common air pollutants in Signal Hill, California

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

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

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Frequently asked questions

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

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

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

What is the air quality in Signal Hill, California right now?

What pollutant is most frequently found in Signal Hill, California?

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

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

What is the current level of PM10 in Signal Hill, California?

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

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

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

What is the current level of nitrogen dioxide (NO2) in Signal Hill, 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 Signal Hill, California right now?

What is the current level of PM₁₀ in Signal Hill, California?

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

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

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