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

Ontario, California currently has a PM10 concentration of 67.861 μg/m3.

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

The current sulfur dioxide (SO2) concentration in Ontario, California is 0.918 ppb.

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

Ontario, California currently has an ozone (O3) concentration of 80.321 ppm.

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

The current level of nitrogen dioxide (NO2) in Ontario, California is 19.257 ppb.

Current air quality index in Ontario, California today

Q: What is the PM2.5 concentration in Ontario, California right now?

Ontario, California currently has a PM2.5 concentration of 13.463 μg/m3.

Stay updated with real-time air quality in Ontario, 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)

133

Unhealthy for sensitive groups

Ontario, California

Last updated: ... (Local time)

Common air pollutants in Ontario, California

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

13.46 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

67.86 μg/m³

155

255

425

605+

Ozone (O₃)

80.32 ppb

201

201+

Sulfur Dioxide (SO₂)

0.92 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

19.26 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.28 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Ontario, California

Get Live Pollen Counts

Ontario, California

Scroll To Air Quality Map

Track live Ontario, California air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-07-22T01:00:00.000Z	49 \| good	8.565 \| good	36.951 \| good	49.946 \| good	0.616 \| good	18.1 \| good	0.187 \| good
2026-07-22T02:00:00.000Z	52 \| moderate	9.713 \| good	35.927 \| good	40.395 \| good	0.577 \| good	14.668 \| good	0.175 \| good
2026-07-22T03:00:00.000Z	38 \| good	6.557 \| good	27.703 \| good	35.283 \| good	0.488 \| good	13.848 \| good	0.187 \| good
2026-07-22T04:00:00.000Z	49 \| good	8.83 \| good	53.331 \| good	33.163 \| good	0.513 \| good	16.297 \| good	0.2 \| good
2026-07-22T05:00:00.000Z	38 \| good	7.398 \| good	26.468 \| good	28.579 \| good	0.695 \| good	17.391 \| good	0.258 \| good
2026-07-22T06:00:00.000Z	38 \| good	6.712 \| good	27.808 \| good	25.279 \| good	0.568 \| good	18.318 \| good	0.224 \| good
2026-07-22T07:00:00.000Z	38 \| good	6.822 \| good	30.114 \| good	24.653 \| good	0.568 \| good	18.318 \| good	0.224 \| good
2026-07-22T08:00:00.000Z	54 \| moderate	7.524 \| good	61.143 \| fine	17.562 \| good	0.558 \| good	17.442 \| good	0.272 \| good
2026-07-22T09:00:00.000Z	49 \| good	8.795 \| good	32.615 \| good	15.986 \| good	0.569 \| good	18.415 \| good	0.248 \| good
2026-07-22T10:00:00.000Z	38 \| good	7.327 \| good	25 \| good	14.677 \| good	0.509 \| good	19.812 \| good	0.248 \| good
2026-07-22T11:00:00.000Z	38 \| good	7.398 \| good	27.821 \| good	12.632 \| good	0.623 \| good	16.976 \| good	0.236 \| good
2026-07-22T12:00:00.000Z	38 \| good	6.897 \| good	24.718 \| good	12.502 \| good	0.557 \| good	19.069 \| good	0.27 \| good
2026-07-22T13:00:00.000Z	44 \| good	8.202 \| good	27.102 \| good	11.036 \| good	0.555 \| good	19.069 \| good	0.27 \| good
2026-07-22T14:00:00.000Z	52 \| moderate	9.953 \| good	42.613 \| good	13.216 \| good	0.587 \| good	21.24 \| good	0.415 \| good
2026-07-22T15:00:00.000Z	52 \| moderate	10.051 \| good	49.046 \| good	15.58 \| good	0.819 \| good	22.409 \| good	0.381 \| good
2026-07-22T16:00:00.000Z	49 \| good	8.903 \| good	45.103 \| good	17.319 \| good	0.825 \| good	21.085 \| good	0.28 \| good
2026-07-22T17:00:00.000Z	49 \| good	9.454 \| good	39.716 \| good	22.087 \| good	0.755 \| good	20.59 \| good	0.267 \| good
2026-07-22T18:00:00.000Z	49 \| good	9.16 \| good	24.172 \| good	26.176 \| good	0.694 \| good	21.05 \| good	0.267 \| good
2026-07-22T19:00:00.000Z	49 \| good	9.164 \| good	46.851 \| good	33.905 \| good	0.71 \| good	20.458 \| good	0.277 \| good
2026-07-22T20:00:00.000Z	52 \| moderate	9.595 \| good	39.657 \| good	45.03 \| good	0.772 \| good	17.079 \| good	0.277 \| good
2026-07-22T21:00:00.000Z	52 \| moderate	10.294 \| good	47.074 \| good	52.483 \| good	0.746 \| good	19.889 \| good	0.267 \| good
2026-07-22T22:00:00.000Z	52 \| moderate	9.56 \| good	35.393 \| good	54.734 \| good	0.669 \| good	20.065 \| good	0.26 \| good
2026-07-22T23:00:00.000Z	71 \| moderate	10.272 \| good	39.337 \| good	61.229 \| fine	0.557 \| good	19.041 \| good	0.272 \| good
2026-07-23T00:00:00.000Z	77 \| moderate	10.347 \| good	42.402 \| good	63.409 \| fine	0.628 \| good	21.914 \| good	0.26 \| good
2026-07-23T01:00:00.000Z	52 \| moderate	10.16 \| good	39.653 \| good	55.029 \| fine	0.685 \| good	17.828 \| good	0.26 \| good
2026-07-23T02:00:00.000Z	45 \| good	8.029 \| good	33.444 \| good	49.181 \| good	0.721 \| good	15.867 \| good	0.272 \| good
2026-07-23T03:00:00.000Z	52 \| moderate	9.937 \| good	44.058 \| good	30.557 \| good	1.282 \| good	4.706 \| good	0.112 \| good
2026-07-23T04:00:00.000Z	44 \| good	8.22 \| good	30.16 \| good	35.751 \| good	0.654 \| good	19.998 \| good	0.272 \| good
2026-07-23T05:00:00.000Z	44 \| good	7.979 \| good	31.076 \| good	27.021 \| good	0.811 \| good	24.149 \| good	0.272 \| good
2026-07-23T06:00:00.000Z	38 \| good	7.415 \| good	30.134 \| good	23.071 \| good	0.609 \| good	21.728 \| good	0.284 \| good
2026-07-23T07:00:00.000Z	44 \| good	8.265 \| good	29.336 \| good	24.604 \| good	0.598 \| good	21.728 \| good	0.284 \| good
2026-07-23T08:00:00.000Z	49 \| good	8.591 \| good	35.768 \| good	16.31 \| good	0.6 \| good	19.945 \| good	0.28 \| good
2026-07-23T09:00:00.000Z	38 \| good	7.21 \| good	29.911 \| good	11.852 \| good	0.667 \| good	20.297 \| good	0.255 \| good
2026-07-23T10:00:00.000Z	33 \| good	5.893 \| good	30.313 \| good	12.135 \| good	0.61 \| good	21.746 \| good	0.277 \| good
2026-07-23T11:00:00.000Z	38 \| good	7.44 \| good	29.858 \| good	10.976 \| good	0.816 \| good	21.997 \| good	0.255 \| good
2026-07-23T12:00:00.000Z	49 \| good	8.92 \| good	40.989 \| good	10.653 \| good	0.676 \| good	22.752 \| good	0.314 \| good
2026-07-23T13:00:00.000Z	38 \| good	7.05 \| good	31.413 \| good	9.673 \| good	0.669 \| good	22.752 \| good	0.314 \| good
2026-07-23T14:00:00.000Z	49 \| good	8.597 \| good	50.338 \| good	12.885 \| good	0.752 \| good	23.297 \| good	0.438 \| good
2026-07-23T15:00:00.000Z	58 \| moderate	12.926 \| fine	49.763 \| good	16.149 \| good	0.955 \| good	25.074 \| good	0.436 \| good
2026-07-23T16:00:00.000Z	56 \| moderate	12.114 \| fine	44.032 \| good	18.263 \| good	0.948 \| good	30.794 \| good	0.416 \| good
2026-07-23T17:00:00.000Z	68 \| moderate	12.027 \| good	89.103 \| fine	30.613 \| good	0.839 \| good	28.063 \| good	0.346 \| good
2026-07-23T18:00:00.000Z	97 \| moderate	13.361 \| fine	146.584 \| fine	40.35 \| good	0.907 \| good	32.212 \| good	0.363 \| good
2026-07-23T19:00:00.000Z	60 \| moderate	13.726 \| fine	55.78 \| fine	51.377 \| good	0.837 \| good	28.578 \| good	0.296 \| good
2026-07-23T20:00:00.000Z	87 \| moderate	13.844 \| fine	62.377 \| fine	66.025 \| fine	0.745 \| good	25.219 \| good	0.287 \| good
2026-07-23T21:00:00.000Z	126 \| sensitive	15.422 \| fine	74.873 \| fine	78.483 \| moderate	0.776 \| good	26.658 \| good	0.277 \| good
2026-07-23T22:00:00.000Z	129 \| sensitive	14.953 \| fine	62.426 \| fine	78.573 \| moderate	0.858 \| good	19.248 \| good	0.318 \| good
2026-07-23T23:00:00.000Z	136 \| sensitive	13.785 \| fine	67.56 \| fine	80.8 \| moderate	0.918 \| good	18.127 \| good	0.28 \| good
2026-07-24T00:00:00.000Z	119 \| sensitive	13.626 \| fine	70.491 \| fine	75.51 \| moderate	0.92 \| good	22.899 \| good	0.272 \| good
2026-07-24T00:00:00.000Z	133 \| sensitive	13.463 \| fine	67.861 \| fine	80.321 \| moderate	0.918 \| good	19.257 \| good	0.28 \| good
2026-07-24T01:00:00.000Z	74 \| moderate	14.529 \| fine	65.053 \| fine	61.826 \| fine	1.301 \| good	3.426 \| good	0.128 \| good
2026-07-24T02:00:00.000Z	60 \| moderate	14.3 \| fine	63.159 \| fine	49.785 \| good	1.432 \| good	4.747 \| good	0.131 \| good
2026-07-24T03:00:00.000Z	60 \| moderate	13.704 \| fine	61.132 \| fine	38.611 \| good	1.517 \| good	6.581 \| good	0.134 \| good
2026-07-24T04:00:00.000Z	58 \| moderate	12.902 \| fine	57.137 \| fine	28.532 \| good	1.539 \| good	8.157 \| good	0.138 \| good
2026-07-24T05:00:00.000Z	60 \| moderate	14.495 \| fine	65.065 \| fine	22.099 \| good	1.515 \| good	9.445 \| good	0.14 \| good
2026-07-24T06:00:00.000Z	60 \| moderate	14.252 \| fine	63.079 \| fine	18.176 \| good	1.476 \| good	11.074 \| good	0.143 \| good
2026-07-24T07:00:00.000Z	60 \| moderate	13.766 \| fine	61.031 \| fine	18.573 \| good	1.402 \| good	12.738 \| good	0.148 \| good
2026-07-24T08:00:00.000Z	62 \| moderate	14.872 \| fine	66.925 \| fine	15.432 \| good	1.302 \| good	13.128 \| good	0.15 \| good
2026-07-24T09:00:00.000Z	62 \| moderate	14.569 \| fine	65.022 \| fine	12.211 \| good	1.242 \| good	13.726 \| good	0.152 \| good
2026-07-24T10:00:00.000Z	62 \| moderate	14.883 \| fine	66.934 \| fine	6.297 \| good	1.251 \| good	14.901 \| good	0.158 \| good
2026-07-24T11:00:00.000Z	62 \| moderate	14.553 \| fine	64.979 \| fine	5.589 \| good	1.295 \| good	16.414 \| good	0.164 \| good
2026-07-24T12:00:00.000Z	64 \| moderate	16.157 \| fine	71.063 \| fine	3.069 \| good	1.336 \| good	17.719 \| good	0.171 \| good
2026-07-24T13:00:00.000Z	64 \| moderate	16.477 \| fine	73.008 \| fine	3.216 \| good	1.362 \| good	18.632 \| good	0.178 \| good
2026-07-24T14:00:00.000Z	69 \| moderate	18.86 \| fine	82.956 \| fine	8.308 \| good	1.345 \| good	16.479 \| good	0.185 \| good
2026-07-24T15:00:00.000Z	75 \| moderate	21.887 \| fine	96.779 \| fine	15.964 \| good	1.222 \| good	10.163 \| good	0.15 \| good
2026-07-24T16:00:00.000Z	73 \| moderate	20.707 \| fine	90.939 \| fine	28.903 \| good	1.113 \| good	7.77 \| good	0.14 \| good
2026-07-24T17:00:00.000Z	79 \| moderate	24.133 \| fine	104.921 \| fine	48.916 \| good	1.068 \| good	6.246 \| good	0.138 \| good
2026-07-24T18:00:00.000Z	112 \| sensitive	26.113 \| fine	112.84 \| fine	74.165 \| moderate	1.019 \| good	4.783 \| good	0.136 \| good
2026-07-24T19:00:00.000Z	159 \| unhealthy	24.669 \| fine	106.804 \| fine	89.208 \| poor	0.943 \| good	3.304 \| good	0.133 \| good
2026-07-24T20:00:00.000Z	154 \| unhealthy	18.917 \| fine	82.92 \| fine	87.159 \| poor	0.861 \| good	2.408 \| good	0.126 \| good
2026-07-24T21:00:00.000Z	122 \| sensitive	12.535 \| fine	56.935 \| fine	77.044 \| moderate	0.809 \| good	2.069 \| good	0.12 \| good
2026-07-24T22:00:00.000Z	108 \| sensitive	12.097 \| good	54.925 \| good	72.835 \| moderate	0.809 \| good	1.978 \| good	0.117 \| good
2026-07-24T23:00:00.000Z	100 \| moderate	10.921 \| good	47.938 \| good	69.521 \| fine	0.828 \| good	1.983 \| good	0.114 \| good
2026-07-25T00:00:00.000Z	80 \| moderate	11.177 \| good	49.869 \| good	64.027 \| fine	0.855 \| good	2.166 \| good	0.113 \| good
2026-07-25T01:00:00.000Z	56 \| moderate	11.704 \| good	51.904 \| good	53.674 \| good	0.921 \| good	2.632 \| good	0.113 \| good
2026-07-25T02:00:00.000Z	54 \| moderate	11.31 \| good	49.953 \| good	44.494 \| good	0.991 \| good	3.602 \| good	0.115 \| good
2026-07-25T03:00:00.000Z	56 \| moderate	12.486 \| fine	56.974 \| fine	33.448 \| good	1.061 \| good	5.128 \| good	0.117 \| good
2026-07-25T04:00:00.000Z	54 \| moderate	11.364 \| good	50.006 \| good	26.57 \| good	1.118 \| good	6.43 \| good	0.12 \| good
2026-07-25T05:00:00.000Z	56 \| moderate	11.932 \| good	54 \| good	21.333 \| good	1.139 \| good	7.84 \| good	0.123 \| good
2026-07-25T06:00:00.000Z	56 \| moderate	11.525 \| good	51.036 \| good	18.835 \| good	1.144 \| good	9.354 \| good	0.127 \| good
2026-07-25T07:00:00.000Z	56 \| moderate	11.505 \| good	50.967 \| good	18.143 \| good	1.133 \| good	10.777 \| good	0.131 \| good
2026-07-25T08:00:00.000Z	58 \| moderate	12.806 \| fine	56.996 \| fine	14.843 \| good	1.108 \| good	11.831 \| good	0.136 \| good
2026-07-25T09:00:00.000Z	56 \| moderate	12.494 \| fine	56.999 \| fine	11.38 \| good	1.106 \| good	13.231 \| good	0.141 \| good
2026-07-25T10:00:00.000Z	56 \| moderate	11.537 \| good	51.127 \| good	8.038 \| good	1.15 \| good	14.679 \| good	0.147 \| good
2026-07-25T11:00:00.000Z	52 \| moderate	9.945 \| good	44.051 \| good	7.833 \| good	1.193 \| good	16.166 \| good	0.154 \| good
2026-07-25T12:00:00.000Z	54 \| moderate	11.229 \| good	50.096 \| good	4.401 \| good	1.217 \| good	18.141 \| good	0.162 \| good
2026-07-25T13:00:00.000Z	56 \| moderate	12.182 \| fine	55.057 \| fine	4.693 \| good	1.235 \| good	19.522 \| good	0.172 \| good
2026-07-25T14:00:00.000Z	64 \| moderate	15.553 \| fine	69.146 \| fine	8.06 \| good	1.24 \| good	17.012 \| good	0.18 \| good
2026-07-25T15:00:00.000Z	66 \| moderate	16.58 \| fine	73.089 \| fine	14.727 \| good	1.265 \| good	10.97 \| good	0.149 \| good
2026-07-25T16:00:00.000Z	66 \| moderate	17.259 \| fine	76.865 \| fine	27.503 \| good	1.22 \| good	8.638 \| good	0.139 \| good
2026-07-25T17:00:00.000Z	69 \| moderate	19.43 \| fine	84.811 \| fine	43.588 \| good	1.173 \| good	7.135 \| good	0.135 \| good
2026-07-25T18:00:00.000Z	67 \| moderate	17.76 \| fine	78.827 \| fine	57.225 \| fine	1.1 \| good	5.42 \| good	0.131 \| good
2026-07-25T19:00:00.000Z	97 \| moderate	14.5 \| fine	64.863 \| fine	68.691 \| fine	1.008 \| good	3.676 \| good	0.128 \| good
2026-07-25T20:00:00.000Z	112 \| sensitive	14.643 \| fine	64.875 \| fine	74.369 \| moderate	0.907 \| good	2.622 \| good	0.123 \| good
2026-07-25T21:00:00.000Z	140 \| sensitive	14.146 \| fine	62.786 \| fine	82.062 \| moderate	0.858 \| good	2.207 \| good	0.119 \| good
2026-07-25T22:00:00.000Z	129 \| sensitive	13.329 \| fine	60.732 \| fine	79.009 \| moderate	0.874 \| good	2.059 \| good	0.117 \| good
2026-07-25T23:00:00.000Z	129 \| sensitive	11.121 \| good	48.861 \| good	79.334 \| moderate	0.932 \| good	2.043 \| good	0.116 \| good
2026-07-26T00:00:00.000Z	112 \| sensitive	13.66 \| fine	18.392 \| good	73.52 \| moderate	1.038 \| good	2.21 \| good	0.116 \| good

Ontario

Empower business decisions with accurate air quality data

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

0.28ppm

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.

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Frequently asked questions

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

Air quality updates for Ontario, California are available every hour.

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

Ontario, California experienced its worst air quality at 11:00:00, 2026-07-23.

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

The best air quality in Ontario, California was observed at 10:00:00 on 2026-07-23.

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

The air quality in Ontario, California right now is Unhealthy for Sensitive Groups, with an AQI of 133.

What pollutant is most frequently found in Ontario, California?

In Ontario, California, O3 is the most frequently found pollutant.

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

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

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

Ontario, California currently has a PM_2.5 concentration of 13.463 μg/m³.

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

Ontario, California currently has a PM₁₀ concentration of 67.861 μg/m³.

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

The current carbon monoxide (CO) level in Ontario, California is 0.28 ppm.

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

The current sulfur dioxide (SO₂) concentration in Ontario, California is 0.918 ppb.

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

Ontario, California currently has an ozone (O₃) concentration of 80.321 ppm.

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

The current level of nitrogen dioxide (NO₂) in Ontario, California is 19.257 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-07-22T01:00:00.000Z	49 \| good	8.565 \| good	36.951 \| good	49.946 \| good	0.616 \| good	18.1 \| good	0.187 \| good
2026-07-22T02:00:00.000Z	52 \| moderate	9.713 \| good	35.927 \| good	40.395 \| good	0.577 \| good	14.668 \| good	0.175 \| good
2026-07-22T03:00:00.000Z	38 \| good	6.557 \| good	27.703 \| good	35.283 \| good	0.488 \| good	13.848 \| good	0.187 \| good
2026-07-22T04:00:00.000Z	49 \| good	8.83 \| good	53.331 \| good	33.163 \| good	0.513 \| good	16.297 \| good	0.2 \| good
2026-07-22T05:00:00.000Z	38 \| good	7.398 \| good	26.468 \| good	28.579 \| good	0.695 \| good	17.391 \| good	0.258 \| good
2026-07-22T06:00:00.000Z	38 \| good	6.712 \| good	27.808 \| good	25.279 \| good	0.568 \| good	18.318 \| good	0.224 \| good
2026-07-22T07:00:00.000Z	38 \| good	6.822 \| good	30.114 \| good	24.653 \| good	0.568 \| good	18.318 \| good	0.224 \| good
2026-07-22T08:00:00.000Z	54 \| moderate	7.524 \| good	61.143 \| fine	17.562 \| good	0.558 \| good	17.442 \| good	0.272 \| good
2026-07-22T09:00:00.000Z	49 \| good	8.795 \| good	32.615 \| good	15.986 \| good	0.569 \| good	18.415 \| good	0.248 \| good
2026-07-22T10:00:00.000Z	38 \| good	7.327 \| good	25 \| good	14.677 \| good	0.509 \| good	19.812 \| good	0.248 \| good
2026-07-22T11:00:00.000Z	38 \| good	7.398 \| good	27.821 \| good	12.632 \| good	0.623 \| good	16.976 \| good	0.236 \| good
2026-07-22T12:00:00.000Z	38 \| good	6.897 \| good	24.718 \| good	12.502 \| good	0.557 \| good	19.069 \| good	0.27 \| good
2026-07-22T13:00:00.000Z	44 \| good	8.202 \| good	27.102 \| good	11.036 \| good	0.555 \| good	19.069 \| good	0.27 \| good
2026-07-22T14:00:00.000Z	52 \| moderate	9.953 \| good	42.613 \| good	13.216 \| good	0.587 \| good	21.24 \| good	0.415 \| good
2026-07-22T15:00:00.000Z	52 \| moderate	10.051 \| good	49.046 \| good	15.58 \| good	0.819 \| good	22.409 \| good	0.381 \| good
2026-07-22T16:00:00.000Z	49 \| good	8.903 \| good	45.103 \| good	17.319 \| good	0.825 \| good	21.085 \| good	0.28 \| good
2026-07-22T17:00:00.000Z	49 \| good	9.454 \| good	39.716 \| good	22.087 \| good	0.755 \| good	20.59 \| good	0.267 \| good
2026-07-22T18:00:00.000Z	49 \| good	9.16 \| good	24.172 \| good	26.176 \| good	0.694 \| good	21.05 \| good	0.267 \| good
2026-07-22T19:00:00.000Z	49 \| good	9.164 \| good	46.851 \| good	33.905 \| good	0.71 \| good	20.458 \| good	0.277 \| good
2026-07-22T20:00:00.000Z	52 \| moderate	9.595 \| good	39.657 \| good	45.03 \| good	0.772 \| good	17.079 \| good	0.277 \| good
2026-07-22T21:00:00.000Z	52 \| moderate	10.294 \| good	47.074 \| good	52.483 \| good	0.746 \| good	19.889 \| good	0.267 \| good
2026-07-22T22:00:00.000Z	52 \| moderate	9.56 \| good	35.393 \| good	54.734 \| good	0.669 \| good	20.065 \| good	0.26 \| good
2026-07-22T23:00:00.000Z	71 \| moderate	10.272 \| good	39.337 \| good	61.229 \| fine	0.557 \| good	19.041 \| good	0.272 \| good
2026-07-23T00:00:00.000Z	77 \| moderate	10.347 \| good	42.402 \| good	63.409 \| fine	0.628 \| good	21.914 \| good	0.26 \| good
2026-07-23T01:00:00.000Z	52 \| moderate	10.16 \| good	39.653 \| good	55.029 \| fine	0.685 \| good	17.828 \| good	0.26 \| good
2026-07-23T02:00:00.000Z	45 \| good	8.029 \| good	33.444 \| good	49.181 \| good	0.721 \| good	15.867 \| good	0.272 \| good
2026-07-23T03:00:00.000Z	52 \| moderate	9.937 \| good	44.058 \| good	30.557 \| good	1.282 \| good	4.706 \| good	0.112 \| good
2026-07-23T04:00:00.000Z	44 \| good	8.22 \| good	30.16 \| good	35.751 \| good	0.654 \| good	19.998 \| good	0.272 \| good
2026-07-23T05:00:00.000Z	44 \| good	7.979 \| good	31.076 \| good	27.021 \| good	0.811 \| good	24.149 \| good	0.272 \| good
2026-07-23T06:00:00.000Z	38 \| good	7.415 \| good	30.134 \| good	23.071 \| good	0.609 \| good	21.728 \| good	0.284 \| good
2026-07-23T07:00:00.000Z	44 \| good	8.265 \| good	29.336 \| good	24.604 \| good	0.598 \| good	21.728 \| good	0.284 \| good
2026-07-23T08:00:00.000Z	49 \| good	8.591 \| good	35.768 \| good	16.31 \| good	0.6 \| good	19.945 \| good	0.28 \| good
2026-07-23T09:00:00.000Z	38 \| good	7.21 \| good	29.911 \| good	11.852 \| good	0.667 \| good	20.297 \| good	0.255 \| good
2026-07-23T10:00:00.000Z	33 \| good	5.893 \| good	30.313 \| good	12.135 \| good	0.61 \| good	21.746 \| good	0.277 \| good
2026-07-23T11:00:00.000Z	38 \| good	7.44 \| good	29.858 \| good	10.976 \| good	0.816 \| good	21.997 \| good	0.255 \| good
2026-07-23T12:00:00.000Z	49 \| good	8.92 \| good	40.989 \| good	10.653 \| good	0.676 \| good	22.752 \| good	0.314 \| good
2026-07-23T13:00:00.000Z	38 \| good	7.05 \| good	31.413 \| good	9.673 \| good	0.669 \| good	22.752 \| good	0.314 \| good
2026-07-23T14:00:00.000Z	49 \| good	8.597 \| good	50.338 \| good	12.885 \| good	0.752 \| good	23.297 \| good	0.438 \| good
2026-07-23T15:00:00.000Z	58 \| moderate	12.926 \| fine	49.763 \| good	16.149 \| good	0.955 \| good	25.074 \| good	0.436 \| good
2026-07-23T16:00:00.000Z	56 \| moderate	12.114 \| fine	44.032 \| good	18.263 \| good	0.948 \| good	30.794 \| good	0.416 \| good
2026-07-23T17:00:00.000Z	68 \| moderate	12.027 \| good	89.103 \| fine	30.613 \| good	0.839 \| good	28.063 \| good	0.346 \| good
2026-07-23T18:00:00.000Z	97 \| moderate	13.361 \| fine	146.584 \| fine	40.35 \| good	0.907 \| good	32.212 \| good	0.363 \| good
2026-07-23T19:00:00.000Z	60 \| moderate	13.726 \| fine	55.78 \| fine	51.377 \| good	0.837 \| good	28.578 \| good	0.296 \| good
2026-07-23T20:00:00.000Z	87 \| moderate	13.844 \| fine	62.377 \| fine	66.025 \| fine	0.745 \| good	25.219 \| good	0.287 \| good
2026-07-23T21:00:00.000Z	126 \| sensitive	15.422 \| fine	74.873 \| fine	78.483 \| moderate	0.776 \| good	26.658 \| good	0.277 \| good
2026-07-23T22:00:00.000Z	129 \| sensitive	14.953 \| fine	62.426 \| fine	78.573 \| moderate	0.858 \| good	19.248 \| good	0.318 \| good
2026-07-23T23:00:00.000Z	136 \| sensitive	13.785 \| fine	67.56 \| fine	80.8 \| moderate	0.918 \| good	18.127 \| good	0.28 \| good
2026-07-24T00:00:00.000Z	119 \| sensitive	13.626 \| fine	70.491 \| fine	75.51 \| moderate	0.92 \| good	22.899 \| good	0.272 \| good
2026-07-24T00:00:00.000Z	133 \| sensitive	13.463 \| fine	67.861 \| fine	80.321 \| moderate	0.918 \| good	19.257 \| good	0.28 \| good
2026-07-24T01:00:00.000Z	74 \| moderate	14.529 \| fine	65.053 \| fine	61.826 \| fine	1.301 \| good	3.426 \| good	0.128 \| good
2026-07-24T02:00:00.000Z	60 \| moderate	14.3 \| fine	63.159 \| fine	49.785 \| good	1.432 \| good	4.747 \| good	0.131 \| good
2026-07-24T03:00:00.000Z	60 \| moderate	13.704 \| fine	61.132 \| fine	38.611 \| good	1.517 \| good	6.581 \| good	0.134 \| good
2026-07-24T04:00:00.000Z	58 \| moderate	12.902 \| fine	57.137 \| fine	28.532 \| good	1.539 \| good	8.157 \| good	0.138 \| good
2026-07-24T05:00:00.000Z	60 \| moderate	14.495 \| fine	65.065 \| fine	22.099 \| good	1.515 \| good	9.445 \| good	0.14 \| good
2026-07-24T06:00:00.000Z	60 \| moderate	14.252 \| fine	63.079 \| fine	18.176 \| good	1.476 \| good	11.074 \| good	0.143 \| good
2026-07-24T07:00:00.000Z	60 \| moderate	13.766 \| fine	61.031 \| fine	18.573 \| good	1.402 \| good	12.738 \| good	0.148 \| good
2026-07-24T08:00:00.000Z	62 \| moderate	14.872 \| fine	66.925 \| fine	15.432 \| good	1.302 \| good	13.128 \| good	0.15 \| good
2026-07-24T09:00:00.000Z	62 \| moderate	14.569 \| fine	65.022 \| fine	12.211 \| good	1.242 \| good	13.726 \| good	0.152 \| good
2026-07-24T10:00:00.000Z	62 \| moderate	14.883 \| fine	66.934 \| fine	6.297 \| good	1.251 \| good	14.901 \| good	0.158 \| good
2026-07-24T11:00:00.000Z	62 \| moderate	14.553 \| fine	64.979 \| fine	5.589 \| good	1.295 \| good	16.414 \| good	0.164 \| good
2026-07-24T12:00:00.000Z	64 \| moderate	16.157 \| fine	71.063 \| fine	3.069 \| good	1.336 \| good	17.719 \| good	0.171 \| good
2026-07-24T13:00:00.000Z	64 \| moderate	16.477 \| fine	73.008 \| fine	3.216 \| good	1.362 \| good	18.632 \| good	0.178 \| good
2026-07-24T14:00:00.000Z	69 \| moderate	18.86 \| fine	82.956 \| fine	8.308 \| good	1.345 \| good	16.479 \| good	0.185 \| good
2026-07-24T15:00:00.000Z	75 \| moderate	21.887 \| fine	96.779 \| fine	15.964 \| good	1.222 \| good	10.163 \| good	0.15 \| good
2026-07-24T16:00:00.000Z	73 \| moderate	20.707 \| fine	90.939 \| fine	28.903 \| good	1.113 \| good	7.77 \| good	0.14 \| good
2026-07-24T17:00:00.000Z	79 \| moderate	24.133 \| fine	104.921 \| fine	48.916 \| good	1.068 \| good	6.246 \| good	0.138 \| good
2026-07-24T18:00:00.000Z	112 \| sensitive	26.113 \| fine	112.84 \| fine	74.165 \| moderate	1.019 \| good	4.783 \| good	0.136 \| good
2026-07-24T19:00:00.000Z	159 \| unhealthy	24.669 \| fine	106.804 \| fine	89.208 \| poor	0.943 \| good	3.304 \| good	0.133 \| good
2026-07-24T20:00:00.000Z	154 \| unhealthy	18.917 \| fine	82.92 \| fine	87.159 \| poor	0.861 \| good	2.408 \| good	0.126 \| good
2026-07-24T21:00:00.000Z	122 \| sensitive	12.535 \| fine	56.935 \| fine	77.044 \| moderate	0.809 \| good	2.069 \| good	0.12 \| good
2026-07-24T22:00:00.000Z	108 \| sensitive	12.097 \| good	54.925 \| good	72.835 \| moderate	0.809 \| good	1.978 \| good	0.117 \| good
2026-07-24T23:00:00.000Z	100 \| moderate	10.921 \| good	47.938 \| good	69.521 \| fine	0.828 \| good	1.983 \| good	0.114 \| good
2026-07-25T00:00:00.000Z	80 \| moderate	11.177 \| good	49.869 \| good	64.027 \| fine	0.855 \| good	2.166 \| good	0.113 \| good
2026-07-25T01:00:00.000Z	56 \| moderate	11.704 \| good	51.904 \| good	53.674 \| good	0.921 \| good	2.632 \| good	0.113 \| good
2026-07-25T02:00:00.000Z	54 \| moderate	11.31 \| good	49.953 \| good	44.494 \| good	0.991 \| good	3.602 \| good	0.115 \| good
2026-07-25T03:00:00.000Z	56 \| moderate	12.486 \| fine	56.974 \| fine	33.448 \| good	1.061 \| good	5.128 \| good	0.117 \| good
2026-07-25T04:00:00.000Z	54 \| moderate	11.364 \| good	50.006 \| good	26.57 \| good	1.118 \| good	6.43 \| good	0.12 \| good
2026-07-25T05:00:00.000Z	56 \| moderate	11.932 \| good	54 \| good	21.333 \| good	1.139 \| good	7.84 \| good	0.123 \| good
2026-07-25T06:00:00.000Z	56 \| moderate	11.525 \| good	51.036 \| good	18.835 \| good	1.144 \| good	9.354 \| good	0.127 \| good
2026-07-25T07:00:00.000Z	56 \| moderate	11.505 \| good	50.967 \| good	18.143 \| good	1.133 \| good	10.777 \| good	0.131 \| good
2026-07-25T08:00:00.000Z	58 \| moderate	12.806 \| fine	56.996 \| fine	14.843 \| good	1.108 \| good	11.831 \| good	0.136 \| good
2026-07-25T09:00:00.000Z	56 \| moderate	12.494 \| fine	56.999 \| fine	11.38 \| good	1.106 \| good	13.231 \| good	0.141 \| good
2026-07-25T10:00:00.000Z	56 \| moderate	11.537 \| good	51.127 \| good	8.038 \| good	1.15 \| good	14.679 \| good	0.147 \| good
2026-07-25T11:00:00.000Z	52 \| moderate	9.945 \| good	44.051 \| good	7.833 \| good	1.193 \| good	16.166 \| good	0.154 \| good
2026-07-25T12:00:00.000Z	54 \| moderate	11.229 \| good	50.096 \| good	4.401 \| good	1.217 \| good	18.141 \| good	0.162 \| good
2026-07-25T13:00:00.000Z	56 \| moderate	12.182 \| fine	55.057 \| fine	4.693 \| good	1.235 \| good	19.522 \| good	0.172 \| good
2026-07-25T14:00:00.000Z	64 \| moderate	15.553 \| fine	69.146 \| fine	8.06 \| good	1.24 \| good	17.012 \| good	0.18 \| good
2026-07-25T15:00:00.000Z	66 \| moderate	16.58 \| fine	73.089 \| fine	14.727 \| good	1.265 \| good	10.97 \| good	0.149 \| good
2026-07-25T16:00:00.000Z	66 \| moderate	17.259 \| fine	76.865 \| fine	27.503 \| good	1.22 \| good	8.638 \| good	0.139 \| good
2026-07-25T17:00:00.000Z	69 \| moderate	19.43 \| fine	84.811 \| fine	43.588 \| good	1.173 \| good	7.135 \| good	0.135 \| good
2026-07-25T18:00:00.000Z	67 \| moderate	17.76 \| fine	78.827 \| fine	57.225 \| fine	1.1 \| good	5.42 \| good	0.131 \| good
2026-07-25T19:00:00.000Z	97 \| moderate	14.5 \| fine	64.863 \| fine	68.691 \| fine	1.008 \| good	3.676 \| good	0.128 \| good
2026-07-25T20:00:00.000Z	112 \| sensitive	14.643 \| fine	64.875 \| fine	74.369 \| moderate	0.907 \| good	2.622 \| good	0.123 \| good
2026-07-25T21:00:00.000Z	140 \| sensitive	14.146 \| fine	62.786 \| fine	82.062 \| moderate	0.858 \| good	2.207 \| good	0.119 \| good
2026-07-25T22:00:00.000Z	129 \| sensitive	13.329 \| fine	60.732 \| fine	79.009 \| moderate	0.874 \| good	2.059 \| good	0.117 \| good
2026-07-25T23:00:00.000Z	129 \| sensitive	11.121 \| good	48.861 \| good	79.334 \| moderate	0.932 \| good	2.043 \| good	0.116 \| good
2026-07-26T00:00:00.000Z	112 \| sensitive	13.66 \| fine	18.392 \| good	73.52 \| moderate	1.038 \| good	2.21 \| good	0.116 \| good

Current air quality index in Ontario, California today

Common air pollutants in Ontario, California

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Ontario, California air quality forecast and history

Empower business decisions with accurate air quality data

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

Air quality in nearby cities

Upland, California

Montclair, California

Chino, California

Rancho Cucamonga, California

Claremont, California

Pomona, 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 Ontario, California get updated?

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

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

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

What pollutant is most frequently found in Ontario, California?

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

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

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

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

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

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

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

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

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

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

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