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

Ontario, California currently has a PM10 concentration of 41.593 μg/m3.

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

The current sulfur dioxide (SO2) concentration in Ontario, California is 0.396 ppb.

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

Ontario, California currently has an ozone (O3) concentration of 19.283 ppm.

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

The current level of nitrogen dioxide (NO2) in Ontario, California is 28.605 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 24.582 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)

Moderate

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)

24.58 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

41.59 μg/m³

155

255

425

605+

Ozone (O₃)

19.28 ppb

201

201+

Sulfur Dioxide (SO₂)

0.40 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

28.61 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.54 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
2026-01-21T05:00:00.000Z	67 \| moderate	16.392 \| fine	86.803 \| fine	15.226 \| good	0.624 \| good	32.151 \| good	0.754 \| good
2026-01-21T06:00:00.000Z	71 \| moderate	19.599 \| fine	91.279 \| fine	15.595 \| good	0.509 \| good	33.399 \| good	0.812 \| good
2026-01-21T07:00:00.000Z	75 \| moderate	16.76 \| fine	102.683 \| fine	8.208 \| good	0.581 \| good	33.665 \| good	0.812 \| good
2026-01-21T08:00:00.000Z	64 \| moderate	16.379 \| fine	78.933 \| fine	4.202 \| good	0.662 \| good	30.789 \| good	0.54 \| good
2026-01-21T09:00:00.000Z	75 \| moderate	22.227 \| fine	71.417 \| fine	6.364 \| good	0.516 \| good	28.783 \| good	0.483 \| good
2026-01-21T10:00:00.000Z	71 \| moderate	20.333 \| fine	43.283 \| good	11.213 \| good	0.469 \| good	27.808 \| good	0.455 \| good
2026-01-21T11:00:00.000Z	84 \| moderate	26.985 \| fine	63.881 \| fine	11.633 \| good	0.556 \| good	25.596 \| good	0.555 \| good
2026-01-21T12:00:00.000Z	99 \| moderate	35.333 \| fine	113.275 \| fine	11.508 \| good	0.529 \| good	21.408 \| good	0.474 \| good
2026-01-21T13:00:00.000Z	71 \| moderate	19.512 \| fine	53.944 \| good	14.412 \| good	0.496 \| good	20.837 \| good	0.474 \| good
2026-01-21T14:00:00.000Z	52 \| moderate	10.286 \| good	22.695 \| good	10.061 \| good	0.788 \| good	20.774 \| good	0.556 \| good
2026-01-21T15:00:00.000Z	62 \| moderate	15.082 \| fine	27.095 \| good	8.319 \| good	0.855 \| good	22.765 \| good	0.656 \| good
2026-01-21T16:00:00.000Z	73 \| moderate	20.888 \| fine	63.629 \| fine	9.139 \| good	0.924 \| good	22.599 \| good	0.772 \| good
2026-01-21T17:00:00.000Z	82 \| moderate	26.007 \| fine	102.898 \| fine	10.385 \| good	0.936 \| good	21.883 \| good	0.715 \| good
2026-01-21T18:00:00.000Z	88 \| moderate	29.097 \| fine	52.815 \| good	9.538 \| good	0.684 \| good	24.521 \| good	0.715 \| good
2026-01-21T19:00:00.000Z	79 \| moderate	24.326 \| fine	102.144 \| fine	11.679 \| good	0.797 \| good	31.463 \| good	0.754 \| good
2026-01-21T20:00:00.000Z	86 \| moderate	28.492 \| fine	126.389 \| fine	12.786 \| good	0.71 \| good	37.898 \| good	0.638 \| good
2026-01-21T21:00:00.000Z	96 \| moderate	32.872 \| fine	132.434 \| fine	16.297 \| good	0.55 \| good	34.933 \| good	0.68 \| good
2026-01-21T22:00:00.000Z	99 \| moderate	35.044 \| fine	136.462 \| fine	18.095 \| good	0.574 \| good	35.026 \| good	0.644 \| good
2026-01-21T23:00:00.000Z	94 \| moderate	31.794 \| fine	129.471 \| fine	21.646 \| good	0.584 \| good	31.246 \| good	0.58 \| good
2026-01-22T00:00:00.000Z	110 \| sensitive	38.531 \| moderate	163.667 \| moderate	32.741 \| good	0.657 \| good	25.059 \| good	0.58 \| good
2026-01-22T01:00:00.000Z	69 \| moderate	19.277 \| fine	38.773 \| good	23.796 \| good	0.458 \| good	25.176 \| good	0.598 \| good
2026-01-22T02:00:00.000Z	75 \| moderate	22.053 \| fine	42.593 \| good	23.524 \| good	0.436 \| good	34.052 \| good	0.682 \| good
2026-01-22T03:00:00.000Z	77 \| moderate	22.615 \| fine	41.627 \| good	17.88 \| good	0.425 \| good	34.65 \| good	0.719 \| good
2026-01-22T04:00:00.000Z	77 \| moderate	22.695 \| fine	48.703 \| good	13.405 \| good	0.49 \| good	34.541 \| good	0.717 \| good
2026-01-22T05:00:00.000Z	84 \| moderate	27.396 \| fine	44.447 \| good	12.334 \| good	0.809 \| good	38.697 \| good	0.747 \| good
2026-01-22T06:00:00.000Z	105 \| sensitive	36.889 \| moderate	59.219 \| fine	8.242 \| good	0.632 \| good	39.574 \| good	0.816 \| good
2026-01-22T07:00:00.000Z	132 \| sensitive	47.905 \| moderate	173.062 \| moderate	13.246 \| good	0.659 \| good	39.027 \| good	0.898 \| good
2026-01-22T08:00:00.000Z	124 \| sensitive	45.281 \| moderate	192.422 \| moderate	8.564 \| good	0.682 \| good	35.644 \| good	0.835 \| good
2026-01-22T09:00:00.000Z	137 \| sensitive	49.981 \| moderate	172.48 \| moderate	4.883 \| good	0.664 \| good	33.879 \| good	0.784 \| good
2026-01-22T10:00:00.000Z	94 \| moderate	27.855 \| fine	142.303 \| fine	5.15 \| good	0.633 \| good	35.905 \| good	0.75 \| good
2026-01-22T11:00:00.000Z	82 \| moderate	25.554 \| fine	93.479 \| fine	3.632 \| good	0.595 \| good	32.273 \| good	0.624 \| good
2026-01-22T12:00:00.000Z	86 \| moderate	27.654 \| fine	119.54 \| fine	5.623 \| good	0.708 \| good	27.314 \| good	0.638 \| good
2026-01-22T13:00:00.000Z	102 \| sensitive	36.138 \| moderate	128.346 \| fine	3.217 \| good	0.706 \| good	27.295 \| good	0.638 \| good
2026-01-22T14:00:00.000Z	99 \| moderate	34.65 \| fine	104.027 \| fine	5.151 \| good	0.571 \| good	26.648 \| good	0.743 \| good
2026-01-22T15:00:00.000Z	132 \| sensitive	48.45 \| moderate	71.876 \| fine	6.258 \| good	0.69 \| good	27.171 \| good	0.815 \| good
2026-01-22T16:00:00.000Z	128 \| sensitive	43.15 \| moderate	209.196 \| moderate	4.287 \| good	0.77 \| good	28.214 \| good	0.807 \| good
2026-01-22T17:00:00.000Z	73 \| moderate	20.84 \| fine	61.407 \| fine	6.374 \| good	0.878 \| good	27.648 \| good	0.747 \| good
2026-01-22T18:00:00.000Z	117 \| sensitive	42.051 \| moderate	70.13 \| fine	2.169 \| good	0.787 \| good	24.563 \| good	0.675 \| good
2026-01-22T19:00:00.000Z	75 \| moderate	21.689 \| fine	67.715 \| fine	12.591 \| good	0.637 \| good	23.976 \| good	0.722 \| good
2026-01-22T20:00:00.000Z	75 \| moderate	22.16 \| fine	43.069 \| good	11.653 \| good	0.559 \| good	23.947 \| good	0.589 \| good
2026-01-22T21:00:00.000Z	94 \| moderate	31.874 \| fine	65.42 \| fine	14.341 \| good	0.563 \| good	26.467 \| good	0.592 \| good
2026-01-22T22:00:00.000Z	62 \| moderate	14.948 \| fine	27.19 \| good	23.093 \| good	0.726 \| good	29.428 \| good	0.579 \| good
2026-01-22T23:00:00.000Z	62 \| moderate	14.961 \| fine	28.93 \| good	22.569 \| good	0.607 \| good	18.507 \| good	0.59 \| good
2026-01-23T00:00:00.000Z	49 \| good	8.518 \| good	39.769 \| good	10.426 \| good	0.42 \| good	31.174 \| good	0.616 \| good
2026-01-23T01:00:00.000Z	66 \| moderate	17.396 \| fine	26.312 \| good	30.521 \| good	0.398 \| good	21.141 \| good	0.566 \| good
2026-01-23T02:00:00.000Z	60 \| moderate	14.091 \| fine	14.33 \| good	11.788 \| good	0.378 \| good	24.033 \| good	0.579 \| good
2026-01-23T03:00:00.000Z	62 \| moderate	14.97 \| fine	52.722 \| good	16.033 \| good	0.329 \| good	27.587 \| good	0.535 \| good
2026-01-23T04:00:00.000Z	62 \| moderate	14.802 \| fine	34.642 \| good	20.424 \| good	0.356 \| good	22.998 \| good	0.497 \| good
2026-01-23T04:00:00.000Z	81 \| moderate	24.582 \| fine	41.593 \| good	19.283 \| good	0.396 \| good	28.605 \| good	0.542 \| good
2026-01-23T05:00:00.000Z	77 \| moderate	23.118 \| fine	101.58 \| fine	7.437 \| good	4.214 \| good	36.684 \| good	0.417 \| good
2026-01-23T06:00:00.000Z	79 \| moderate	23.673 \| fine	103.595 \| fine	6.383 \| good	4.638 \| good	37.08 \| good	0.452 \| good
2026-01-23T07:00:00.000Z	79 \| moderate	23.572 \| fine	102.574 \| fine	6.106 \| good	4.477 \| good	35.972 \| good	0.449 \| good
2026-01-23T08:00:00.000Z	81 \| moderate	24.76 \| fine	108.358 \| fine	6.654 \| good	4.316 \| good	34.864 \| good	0.446 \| good
2026-01-23T09:00:00.000Z	81 \| moderate	25.164 \| fine	109.157 \| fine	7.873 \| good	4.155 \| good	33.757 \| good	0.442 \| good
2026-01-23T10:00:00.000Z	79 \| moderate	24.186 \| fine	105.61 \| fine	7.746 \| good	4.055 \| good	32.351 \| good	0.424 \| good
2026-01-23T11:00:00.000Z	79 \| moderate	24.414 \| fine	106.439 \| fine	7.535 \| good	3.955 \| good	30.945 \| good	0.406 \| good
2026-01-23T12:00:00.000Z	84 \| moderate	27.126 \| fine	118.459 \| fine	6.449 \| good	3.855 \| good	29.539 \| good	0.387 \| good
2026-01-23T13:00:00.000Z	84 \| moderate	26.58 \| fine	115.851 \| fine	4.686 \| good	4.127 \| good	29.658 \| good	0.394 \| good
2026-01-23T14:00:00.000Z	86 \| moderate	27.516 \| fine	119.581 \| fine	3.031 \| good	4.4 \| good	29.777 \| good	0.401 \| good
2026-01-23T15:00:00.000Z	92 \| moderate	31.253 \| fine	135.297 \| fine	1.926 \| good	4.672 \| good	29.896 \| good	0.408 \| good
2026-01-23T16:00:00.000Z	88 \| moderate	28.69 \| fine	124.005 \| fine	4.857 \| good	5.089 \| good	27.828 \| good	0.37 \| good
2026-01-23T17:00:00.000Z	84 \| moderate	26.668 \| fine	116.471 \| fine	8.981 \| good	5.506 \| good	25.76 \| good	0.333 \| good
2026-01-23T18:00:00.000Z	84 \| moderate	27.121 \| fine	117.921 \| fine	14.707 \| good	5.923 \| good	23.693 \| good	0.295 \| good
2026-01-23T19:00:00.000Z	77 \| moderate	22.69 \| fine	99.397 \| fine	25.512 \| good	4.863 \| good	20.059 \| good	0.254 \| good
2026-01-23T20:00:00.000Z	66 \| moderate	16.735 \| fine	73.662 \| fine	30.656 \| good	3.802 \| good	16.425 \| good	0.213 \| good
2026-01-23T21:00:00.000Z	56 \| moderate	12.063 \| good	53.481 \| good	33.387 \| good	2.742 \| good	12.791 \| good	0.173 \| good
2026-01-23T22:00:00.000Z	52 \| moderate	9.606 \| good	42.829 \| good	33.595 \| good	3.006 \| good	13.669 \| good	0.172 \| good
2026-01-23T23:00:00.000Z	49 \| good	8.572 \| good	37.758 \| good	33.237 \| good	3.27 \| good	14.548 \| good	0.17 \| good
2026-01-24T00:00:00.000Z	33 \| good	5.575 \| good	24.173 \| good	30.167 \| good	3.534 \| good	15.426 \| good	0.169 \| good
2026-01-24T01:00:00.000Z	33 \| good	5.55 \| good	24.225 \| good	25.423 \| good	3.995 \| good	22.65 \| good	0.218 \| good
2026-01-24T02:00:00.000Z	44 \| good	7.789 \| good	34.062 \| good	21.269 \| good	4.456 \| good	29.873 \| good	0.267 \| good
2026-01-24T03:00:00.000Z	54 \| moderate	10.998 \| good	48.825 \| good	13.558 \| good	4.917 \| good	37.096 \| good	0.317 \| good
2026-01-24T04:00:00.000Z	58 \| moderate	12.922 \| fine	58.608 \| fine	9.011 \| good	5.308 \| good	36.951 \| good	0.339 \| good
2026-01-24T05:00:00.000Z	60 \| moderate	13.761 \| fine	61.455 \| fine	5.312 \| good	5.699 \| good	36.805 \| good	0.362 \| good
2026-01-24T06:00:00.000Z	62 \| moderate	14.642 \| fine	65.706 \| fine	5.829 \| good	6.089 \| good	36.66 \| good	0.385 \| good
2026-01-24T07:00:00.000Z	62 \| moderate	15.278 \| fine	67.785 \| fine	6.981 \| good	6.072 \| good	35.348 \| good	0.366 \| good
2026-01-24T08:00:00.000Z	64 \| moderate	16.33 \| fine	72.99 \| fine	6.508 \| good	6.056 \| good	34.037 \| good	0.347 \| good
2026-01-24T09:00:00.000Z	69 \| moderate	18.677 \| fine	82.844 \| fine	4.437 \| good	6.039 \| good	32.725 \| good	0.328 \| good
2026-01-24T10:00:00.000Z	69 \| moderate	18.653 \| fine	82.522 \| fine	2.36 \| good	6.032 \| good	31.623 \| good	0.309 \| good
2026-01-24T11:00:00.000Z	71 \| moderate	19.565 \| fine	86.525 \| fine	2.34 \| good	6.025 \| good	30.521 \| good	0.289 \| good
2026-01-24T12:00:00.000Z	75 \| moderate	22.009 \| fine	96.768 \| fine	3.058 \| good	6.018 \| good	29.419 \| good	0.269 \| good
2026-01-24T13:00:00.000Z	77 \| moderate	23.413 \| fine	102.59 \| fine	2.611 \| good	5.995 \| good	28.651 \| good	0.274 \| good
2026-01-24T14:00:00.000Z	79 \| moderate	24.315 \| fine	106.641 \| fine	1.958 \| good	5.972 \| good	27.882 \| good	0.278 \| good
2026-01-24T15:00:00.000Z	84 \| moderate	26.985 \| fine	117.917 \| fine	1.543 \| good	5.949 \| good	27.113 \| good	0.283 \| good
2026-01-24T16:00:00.000Z	82 \| moderate	26.403 \| fine	114.508 \| fine	6.13 \| good	5.814 \| good	22.083 \| good	0.249 \| good
2026-01-24T17:00:00.000Z	71 \| moderate	19.85 \| fine	87.636 \| fine	14.148 \| good	5.678 \| good	17.053 \| good	0.215 \| good
2026-01-24T18:00:00.000Z	56 \| moderate	12.035 \| good	53.369 \| good	23.981 \| good	5.542 \| good	12.022 \| good	0.181 \| good
2026-01-24T19:00:00.000Z	44 \| good	8.487 \| good	37.093 \| good	30.868 \| good	4.756 \| good	10.311 \| good	0.172 \| good
2026-01-24T20:00:00.000Z	44 \| good	8.307 \| good	36.451 \| good	34.836 \| good	3.97 \| good	8.6 \| good	0.163 \| good
2026-01-24T21:00:00.000Z	44 \| good	8.079 \| good	35.611 \| good	38.378 \| good	3.184 \| good	6.889 \| good	0.154 \| good
2026-01-24T22:00:00.000Z	52 \| moderate	9.746 \| good	42.996 \| good	41.4 \| good	3.285 \| good	7.605 \| good	0.157 \| good
2026-01-24T23:00:00.000Z	52 \| moderate	10.485 \| good	46.27 \| good	44.125 \| good	3.387 \| good	8.321 \| good	0.16 \| good
2026-01-25T00:00:00.000Z	58 \| moderate	13.267 \| fine	14.028 \| good	40.109 \| good	3.468 \| good	9.007 \| good	0.162 \| good
2026-01-25T01:00:00.000Z	67 \| moderate	17.892 \| fine	79.693 \| fine	34.019 \| good	3.715 \| good	16.108 \| good	0.205 \| good
2026-01-25T02:00:00.000Z	73 \| moderate	21.047 \| fine	91.977 \| fine	25.997 \| good	3.942 \| good	23.178 \| good	0.247 \| good
2026-01-25T03:00:00.000Z	77 \| moderate	22.556 \| fine	98.737 \| fine	17.952 \| good	4.168 \| good	30.248 \| good	0.29 \| good
2026-01-25T04:00:00.000Z	79 \| moderate	23.928 \| fine	104.048 \| fine	12.981 \| good	4.17 \| good	29.279 \| good	0.314 \| good

Ontario

Empower business decisions with accurate air quality data

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

0.54ppm

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 09:00:00, 2026-01-22.

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

The best air quality in Ontario, California was observed at 12:00:00 on 2026-01-23.

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

The air quality in Ontario, California right now is Moderate, with an AQI of 81.

What pollutant is most frequently found in Ontario, California?

In Ontario, California, PM2.5 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 24.582 μg/m³.

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

Ontario, California currently has a PM₁₀ concentration of 41.593 μg/m³.

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

The current carbon monoxide (CO) level in Ontario, California is 0.542 ppm.

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

The current sulfur dioxide (SO₂) concentration in Ontario, California is 0.396 ppb.

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

Ontario, California currently has an ozone (O₃) concentration of 19.283 ppm.

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

The current level of nitrogen dioxide (NO₂) in Ontario, California is 28.605 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-01-21T05:00:00.000Z	67 \| moderate	16.392 \| fine	86.803 \| fine	15.226 \| good	0.624 \| good	32.151 \| good	0.754 \| good
2026-01-21T06:00:00.000Z	71 \| moderate	19.599 \| fine	91.279 \| fine	15.595 \| good	0.509 \| good	33.399 \| good	0.812 \| good
2026-01-21T07:00:00.000Z	75 \| moderate	16.76 \| fine	102.683 \| fine	8.208 \| good	0.581 \| good	33.665 \| good	0.812 \| good
2026-01-21T08:00:00.000Z	64 \| moderate	16.379 \| fine	78.933 \| fine	4.202 \| good	0.662 \| good	30.789 \| good	0.54 \| good
2026-01-21T09:00:00.000Z	75 \| moderate	22.227 \| fine	71.417 \| fine	6.364 \| good	0.516 \| good	28.783 \| good	0.483 \| good
2026-01-21T10:00:00.000Z	71 \| moderate	20.333 \| fine	43.283 \| good	11.213 \| good	0.469 \| good	27.808 \| good	0.455 \| good
2026-01-21T11:00:00.000Z	84 \| moderate	26.985 \| fine	63.881 \| fine	11.633 \| good	0.556 \| good	25.596 \| good	0.555 \| good
2026-01-21T12:00:00.000Z	99 \| moderate	35.333 \| fine	113.275 \| fine	11.508 \| good	0.529 \| good	21.408 \| good	0.474 \| good
2026-01-21T13:00:00.000Z	71 \| moderate	19.512 \| fine	53.944 \| good	14.412 \| good	0.496 \| good	20.837 \| good	0.474 \| good
2026-01-21T14:00:00.000Z	52 \| moderate	10.286 \| good	22.695 \| good	10.061 \| good	0.788 \| good	20.774 \| good	0.556 \| good
2026-01-21T15:00:00.000Z	62 \| moderate	15.082 \| fine	27.095 \| good	8.319 \| good	0.855 \| good	22.765 \| good	0.656 \| good
2026-01-21T16:00:00.000Z	73 \| moderate	20.888 \| fine	63.629 \| fine	9.139 \| good	0.924 \| good	22.599 \| good	0.772 \| good
2026-01-21T17:00:00.000Z	82 \| moderate	26.007 \| fine	102.898 \| fine	10.385 \| good	0.936 \| good	21.883 \| good	0.715 \| good
2026-01-21T18:00:00.000Z	88 \| moderate	29.097 \| fine	52.815 \| good	9.538 \| good	0.684 \| good	24.521 \| good	0.715 \| good
2026-01-21T19:00:00.000Z	79 \| moderate	24.326 \| fine	102.144 \| fine	11.679 \| good	0.797 \| good	31.463 \| good	0.754 \| good
2026-01-21T20:00:00.000Z	86 \| moderate	28.492 \| fine	126.389 \| fine	12.786 \| good	0.71 \| good	37.898 \| good	0.638 \| good
2026-01-21T21:00:00.000Z	96 \| moderate	32.872 \| fine	132.434 \| fine	16.297 \| good	0.55 \| good	34.933 \| good	0.68 \| good
2026-01-21T22:00:00.000Z	99 \| moderate	35.044 \| fine	136.462 \| fine	18.095 \| good	0.574 \| good	35.026 \| good	0.644 \| good
2026-01-21T23:00:00.000Z	94 \| moderate	31.794 \| fine	129.471 \| fine	21.646 \| good	0.584 \| good	31.246 \| good	0.58 \| good
2026-01-22T00:00:00.000Z	110 \| sensitive	38.531 \| moderate	163.667 \| moderate	32.741 \| good	0.657 \| good	25.059 \| good	0.58 \| good
2026-01-22T01:00:00.000Z	69 \| moderate	19.277 \| fine	38.773 \| good	23.796 \| good	0.458 \| good	25.176 \| good	0.598 \| good
2026-01-22T02:00:00.000Z	75 \| moderate	22.053 \| fine	42.593 \| good	23.524 \| good	0.436 \| good	34.052 \| good	0.682 \| good
2026-01-22T03:00:00.000Z	77 \| moderate	22.615 \| fine	41.627 \| good	17.88 \| good	0.425 \| good	34.65 \| good	0.719 \| good
2026-01-22T04:00:00.000Z	77 \| moderate	22.695 \| fine	48.703 \| good	13.405 \| good	0.49 \| good	34.541 \| good	0.717 \| good
2026-01-22T05:00:00.000Z	84 \| moderate	27.396 \| fine	44.447 \| good	12.334 \| good	0.809 \| good	38.697 \| good	0.747 \| good
2026-01-22T06:00:00.000Z	105 \| sensitive	36.889 \| moderate	59.219 \| fine	8.242 \| good	0.632 \| good	39.574 \| good	0.816 \| good
2026-01-22T07:00:00.000Z	132 \| sensitive	47.905 \| moderate	173.062 \| moderate	13.246 \| good	0.659 \| good	39.027 \| good	0.898 \| good
2026-01-22T08:00:00.000Z	124 \| sensitive	45.281 \| moderate	192.422 \| moderate	8.564 \| good	0.682 \| good	35.644 \| good	0.835 \| good
2026-01-22T09:00:00.000Z	137 \| sensitive	49.981 \| moderate	172.48 \| moderate	4.883 \| good	0.664 \| good	33.879 \| good	0.784 \| good
2026-01-22T10:00:00.000Z	94 \| moderate	27.855 \| fine	142.303 \| fine	5.15 \| good	0.633 \| good	35.905 \| good	0.75 \| good
2026-01-22T11:00:00.000Z	82 \| moderate	25.554 \| fine	93.479 \| fine	3.632 \| good	0.595 \| good	32.273 \| good	0.624 \| good
2026-01-22T12:00:00.000Z	86 \| moderate	27.654 \| fine	119.54 \| fine	5.623 \| good	0.708 \| good	27.314 \| good	0.638 \| good
2026-01-22T13:00:00.000Z	102 \| sensitive	36.138 \| moderate	128.346 \| fine	3.217 \| good	0.706 \| good	27.295 \| good	0.638 \| good
2026-01-22T14:00:00.000Z	99 \| moderate	34.65 \| fine	104.027 \| fine	5.151 \| good	0.571 \| good	26.648 \| good	0.743 \| good
2026-01-22T15:00:00.000Z	132 \| sensitive	48.45 \| moderate	71.876 \| fine	6.258 \| good	0.69 \| good	27.171 \| good	0.815 \| good
2026-01-22T16:00:00.000Z	128 \| sensitive	43.15 \| moderate	209.196 \| moderate	4.287 \| good	0.77 \| good	28.214 \| good	0.807 \| good
2026-01-22T17:00:00.000Z	73 \| moderate	20.84 \| fine	61.407 \| fine	6.374 \| good	0.878 \| good	27.648 \| good	0.747 \| good
2026-01-22T18:00:00.000Z	117 \| sensitive	42.051 \| moderate	70.13 \| fine	2.169 \| good	0.787 \| good	24.563 \| good	0.675 \| good
2026-01-22T19:00:00.000Z	75 \| moderate	21.689 \| fine	67.715 \| fine	12.591 \| good	0.637 \| good	23.976 \| good	0.722 \| good
2026-01-22T20:00:00.000Z	75 \| moderate	22.16 \| fine	43.069 \| good	11.653 \| good	0.559 \| good	23.947 \| good	0.589 \| good
2026-01-22T21:00:00.000Z	94 \| moderate	31.874 \| fine	65.42 \| fine	14.341 \| good	0.563 \| good	26.467 \| good	0.592 \| good
2026-01-22T22:00:00.000Z	62 \| moderate	14.948 \| fine	27.19 \| good	23.093 \| good	0.726 \| good	29.428 \| good	0.579 \| good
2026-01-22T23:00:00.000Z	62 \| moderate	14.961 \| fine	28.93 \| good	22.569 \| good	0.607 \| good	18.507 \| good	0.59 \| good
2026-01-23T00:00:00.000Z	49 \| good	8.518 \| good	39.769 \| good	10.426 \| good	0.42 \| good	31.174 \| good	0.616 \| good
2026-01-23T01:00:00.000Z	66 \| moderate	17.396 \| fine	26.312 \| good	30.521 \| good	0.398 \| good	21.141 \| good	0.566 \| good
2026-01-23T02:00:00.000Z	60 \| moderate	14.091 \| fine	14.33 \| good	11.788 \| good	0.378 \| good	24.033 \| good	0.579 \| good
2026-01-23T03:00:00.000Z	62 \| moderate	14.97 \| fine	52.722 \| good	16.033 \| good	0.329 \| good	27.587 \| good	0.535 \| good
2026-01-23T04:00:00.000Z	62 \| moderate	14.802 \| fine	34.642 \| good	20.424 \| good	0.356 \| good	22.998 \| good	0.497 \| good
2026-01-23T04:00:00.000Z	81 \| moderate	24.582 \| fine	41.593 \| good	19.283 \| good	0.396 \| good	28.605 \| good	0.542 \| good
2026-01-23T05:00:00.000Z	77 \| moderate	23.118 \| fine	101.58 \| fine	7.437 \| good	4.214 \| good	36.684 \| good	0.417 \| good
2026-01-23T06:00:00.000Z	79 \| moderate	23.673 \| fine	103.595 \| fine	6.383 \| good	4.638 \| good	37.08 \| good	0.452 \| good
2026-01-23T07:00:00.000Z	79 \| moderate	23.572 \| fine	102.574 \| fine	6.106 \| good	4.477 \| good	35.972 \| good	0.449 \| good
2026-01-23T08:00:00.000Z	81 \| moderate	24.76 \| fine	108.358 \| fine	6.654 \| good	4.316 \| good	34.864 \| good	0.446 \| good
2026-01-23T09:00:00.000Z	81 \| moderate	25.164 \| fine	109.157 \| fine	7.873 \| good	4.155 \| good	33.757 \| good	0.442 \| good
2026-01-23T10:00:00.000Z	79 \| moderate	24.186 \| fine	105.61 \| fine	7.746 \| good	4.055 \| good	32.351 \| good	0.424 \| good
2026-01-23T11:00:00.000Z	79 \| moderate	24.414 \| fine	106.439 \| fine	7.535 \| good	3.955 \| good	30.945 \| good	0.406 \| good
2026-01-23T12:00:00.000Z	84 \| moderate	27.126 \| fine	118.459 \| fine	6.449 \| good	3.855 \| good	29.539 \| good	0.387 \| good
2026-01-23T13:00:00.000Z	84 \| moderate	26.58 \| fine	115.851 \| fine	4.686 \| good	4.127 \| good	29.658 \| good	0.394 \| good
2026-01-23T14:00:00.000Z	86 \| moderate	27.516 \| fine	119.581 \| fine	3.031 \| good	4.4 \| good	29.777 \| good	0.401 \| good
2026-01-23T15:00:00.000Z	92 \| moderate	31.253 \| fine	135.297 \| fine	1.926 \| good	4.672 \| good	29.896 \| good	0.408 \| good
2026-01-23T16:00:00.000Z	88 \| moderate	28.69 \| fine	124.005 \| fine	4.857 \| good	5.089 \| good	27.828 \| good	0.37 \| good
2026-01-23T17:00:00.000Z	84 \| moderate	26.668 \| fine	116.471 \| fine	8.981 \| good	5.506 \| good	25.76 \| good	0.333 \| good
2026-01-23T18:00:00.000Z	84 \| moderate	27.121 \| fine	117.921 \| fine	14.707 \| good	5.923 \| good	23.693 \| good	0.295 \| good
2026-01-23T19:00:00.000Z	77 \| moderate	22.69 \| fine	99.397 \| fine	25.512 \| good	4.863 \| good	20.059 \| good	0.254 \| good
2026-01-23T20:00:00.000Z	66 \| moderate	16.735 \| fine	73.662 \| fine	30.656 \| good	3.802 \| good	16.425 \| good	0.213 \| good
2026-01-23T21:00:00.000Z	56 \| moderate	12.063 \| good	53.481 \| good	33.387 \| good	2.742 \| good	12.791 \| good	0.173 \| good
2026-01-23T22:00:00.000Z	52 \| moderate	9.606 \| good	42.829 \| good	33.595 \| good	3.006 \| good	13.669 \| good	0.172 \| good
2026-01-23T23:00:00.000Z	49 \| good	8.572 \| good	37.758 \| good	33.237 \| good	3.27 \| good	14.548 \| good	0.17 \| good
2026-01-24T00:00:00.000Z	33 \| good	5.575 \| good	24.173 \| good	30.167 \| good	3.534 \| good	15.426 \| good	0.169 \| good
2026-01-24T01:00:00.000Z	33 \| good	5.55 \| good	24.225 \| good	25.423 \| good	3.995 \| good	22.65 \| good	0.218 \| good
2026-01-24T02:00:00.000Z	44 \| good	7.789 \| good	34.062 \| good	21.269 \| good	4.456 \| good	29.873 \| good	0.267 \| good
2026-01-24T03:00:00.000Z	54 \| moderate	10.998 \| good	48.825 \| good	13.558 \| good	4.917 \| good	37.096 \| good	0.317 \| good
2026-01-24T04:00:00.000Z	58 \| moderate	12.922 \| fine	58.608 \| fine	9.011 \| good	5.308 \| good	36.951 \| good	0.339 \| good
2026-01-24T05:00:00.000Z	60 \| moderate	13.761 \| fine	61.455 \| fine	5.312 \| good	5.699 \| good	36.805 \| good	0.362 \| good
2026-01-24T06:00:00.000Z	62 \| moderate	14.642 \| fine	65.706 \| fine	5.829 \| good	6.089 \| good	36.66 \| good	0.385 \| good
2026-01-24T07:00:00.000Z	62 \| moderate	15.278 \| fine	67.785 \| fine	6.981 \| good	6.072 \| good	35.348 \| good	0.366 \| good
2026-01-24T08:00:00.000Z	64 \| moderate	16.33 \| fine	72.99 \| fine	6.508 \| good	6.056 \| good	34.037 \| good	0.347 \| good
2026-01-24T09:00:00.000Z	69 \| moderate	18.677 \| fine	82.844 \| fine	4.437 \| good	6.039 \| good	32.725 \| good	0.328 \| good
2026-01-24T10:00:00.000Z	69 \| moderate	18.653 \| fine	82.522 \| fine	2.36 \| good	6.032 \| good	31.623 \| good	0.309 \| good
2026-01-24T11:00:00.000Z	71 \| moderate	19.565 \| fine	86.525 \| fine	2.34 \| good	6.025 \| good	30.521 \| good	0.289 \| good
2026-01-24T12:00:00.000Z	75 \| moderate	22.009 \| fine	96.768 \| fine	3.058 \| good	6.018 \| good	29.419 \| good	0.269 \| good
2026-01-24T13:00:00.000Z	77 \| moderate	23.413 \| fine	102.59 \| fine	2.611 \| good	5.995 \| good	28.651 \| good	0.274 \| good
2026-01-24T14:00:00.000Z	79 \| moderate	24.315 \| fine	106.641 \| fine	1.958 \| good	5.972 \| good	27.882 \| good	0.278 \| good
2026-01-24T15:00:00.000Z	84 \| moderate	26.985 \| fine	117.917 \| fine	1.543 \| good	5.949 \| good	27.113 \| good	0.283 \| good
2026-01-24T16:00:00.000Z	82 \| moderate	26.403 \| fine	114.508 \| fine	6.13 \| good	5.814 \| good	22.083 \| good	0.249 \| good
2026-01-24T17:00:00.000Z	71 \| moderate	19.85 \| fine	87.636 \| fine	14.148 \| good	5.678 \| good	17.053 \| good	0.215 \| good
2026-01-24T18:00:00.000Z	56 \| moderate	12.035 \| good	53.369 \| good	23.981 \| good	5.542 \| good	12.022 \| good	0.181 \| good
2026-01-24T19:00:00.000Z	44 \| good	8.487 \| good	37.093 \| good	30.868 \| good	4.756 \| good	10.311 \| good	0.172 \| good
2026-01-24T20:00:00.000Z	44 \| good	8.307 \| good	36.451 \| good	34.836 \| good	3.97 \| good	8.6 \| good	0.163 \| good
2026-01-24T21:00:00.000Z	44 \| good	8.079 \| good	35.611 \| good	38.378 \| good	3.184 \| good	6.889 \| good	0.154 \| good
2026-01-24T22:00:00.000Z	52 \| moderate	9.746 \| good	42.996 \| good	41.4 \| good	3.285 \| good	7.605 \| good	0.157 \| good
2026-01-24T23:00:00.000Z	52 \| moderate	10.485 \| good	46.27 \| good	44.125 \| good	3.387 \| good	8.321 \| good	0.16 \| good
2026-01-25T00:00:00.000Z	58 \| moderate	13.267 \| fine	14.028 \| good	40.109 \| good	3.468 \| good	9.007 \| good	0.162 \| good
2026-01-25T01:00:00.000Z	67 \| moderate	17.892 \| fine	79.693 \| fine	34.019 \| good	3.715 \| good	16.108 \| good	0.205 \| good
2026-01-25T02:00:00.000Z	73 \| moderate	21.047 \| fine	91.977 \| fine	25.997 \| good	3.942 \| good	23.178 \| good	0.247 \| good
2026-01-25T03:00:00.000Z	77 \| moderate	22.556 \| fine	98.737 \| fine	17.952 \| good	4.168 \| good	30.248 \| good	0.29 \| good
2026-01-25T04:00:00.000Z	79 \| moderate	23.928 \| fine	104.048 \| fine	12.981 \| good	4.17 \| good	29.279 \| good	0.314 \| 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?