What is the current concentration of PM10 in O'fallon, Illinois?

The current PM10 concentration at O'fallon, Illinois is 49.441 μg/m3.

What is the current concentration of sulfur dioxide (SO2) in O'fallon, Illinois?

The current sulfur dioxide (SO2) concentration at O'fallon, Illinois is 0.421 ppb.

What is the current concentration of ozone (O3) in O'fallon, Illinois?

The current ozone (O3) concentration at O'fallon, Illinois is 15.965 ppm.

What is the current concentration of nitrogen dioxide (NO2) in O'fallon, Illinois?

The current nitrogen dioxide (NO2) concentration at O'fallon, Illinois is 13.376 ppb.

Live air quality index in O'Fallon, Illinois today

Name: Live air pollution levels in O'Fallon, Illinois today
Creator: Ambee

Stay updated with real-time air quality in O'Fallon, Illinois 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

O'Fallon, Illinois

Last updated: ... (Local time)

Major air pollutants in O'Fallon, Illinois

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

9.28 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

49.44 μg/m³

155

255

425

605+

Ozone (O₃)

15.96 ppb

201

201+

Sulfur Dioxide (SO₂)

0.42 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

13.38 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.56 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

High

O'Fallon, Illinois

Get Live Pollen Counts

O'Fallon, Illinois

Scroll To Air Quality Map

Track live O'Fallon, Illinois air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-06-04T07:00:00.000Z	67 \| moderate	18.118 \| fine	74.003 \| fine	37.284 \| good	0.817 \| good	6.291 \| good	0.263 \| good
2025-06-04T08:00:00.000Z	62 \| moderate	14.667 \| fine	58.832 \| fine	36.945 \| good	0.822 \| good	6.3 \| good	0.257 \| good
2025-06-04T09:00:00.000Z	59 \| moderate	9.128 \| good	71.524 \| fine	38.734 \| good	0.73 \| good	2.8 \| good	0.139 \| good
2025-06-04T10:00:00.000Z	67 \| moderate	18.118 \| fine	69.181 \| fine	32.833 \| good	0.491 \| good	4.022 \| good	0.174 \| good
2025-06-04T11:00:00.000Z	54 \| moderate	10.915 \| good	43.171 \| good	33.546 \| good	0.45 \| good	10.783 \| good	0.186 \| good
2025-06-04T12:00:00.000Z	47 \| good	3.519 \| good	51.078 \| good	35.674 \| good	0.563 \| good	14.178 \| good	0.257 \| good
2025-06-04T13:00:00.000Z	54 \| moderate	10.651 \| good	46.995 \| good	26.084 \| good	0.536 \| good	3.424 \| good	0.218 \| good
2025-06-04T14:00:00.000Z	38 \| good	6.646 \| good	13.152 \| good	30.734 \| good	0.537 \| good	21.952 \| good	0.319 \| good
2025-06-04T15:00:00.000Z	44 \| good	8.364 \| good	39.434 \| good	34.686 \| good	0.609 \| good	16.57 \| good	0.31 \| good
2025-06-04T16:00:00.000Z	49 \| good	8.641 \| good	43.498 \| good	28.692 \| good	0.498 \| good	10.557 \| good	0.296 \| good
2025-06-04T17:00:00.000Z	58 \| moderate	12.982 \| fine	61.638 \| fine	31.883 \| good	0.501 \| good	7.665 \| good	0.292 \| good
2025-06-04T18:00:00.000Z	56 \| moderate	12.485 \| fine	31.486 \| good	36.582 \| good	0.584 \| good	5.491 \| good	0.264 \| good
2025-06-04T19:00:00.000Z	58 \| moderate	12.954 \| fine	53.969 \| good	36.893 \| good	0.647 \| good	4.515 \| good	0.269 \| good
2025-06-04T20:00:00.000Z	62 \| moderate	15.091 \| fine	60.479 \| fine	39.9 \| good	0.629 \| good	6.352 \| good	0.287 \| good
2025-06-04T21:00:00.000Z	54 \| moderate	10.755 \| good	45.774 \| good	38.884 \| good	0.455 \| good	6.115 \| good	0.258 \| good
2025-06-04T22:00:00.000Z	49 \| good	9.152 \| good	33.012 \| good	37.179 \| good	0.471 \| good	6.489 \| good	0.175 \| good
2025-06-04T23:00:00.000Z	33 \| good	6.421 \| good	32.296 \| good	33.107 \| good	0.434 \| good	6.983 \| good	0.258 \| good
2025-06-05T00:00:00.000Z	32 \| good	3.727 \| good	17.43 \| good	34.972 \| good	0.48 \| good	8.206 \| good	0.243 \| good
2025-06-05T01:00:00.000Z	38 \| good	6.677 \| good	28.852 \| good	31.634 \| good	0.49 \| good	5.796 \| good	0.278 \| good
2025-06-05T02:00:00.000Z	49 \| good	9.442 \| good	44.223 \| good	33.334 \| good	0.46 \| good	7.545 \| good	0.25 \| good
2025-06-05T03:00:00.000Z	49 \| good	8.924 \| good	25.793 \| good	34.556 \| good	0.51 \| good	6.116 \| good	0.248 \| good
2025-06-05T04:00:00.000Z	58 \| moderate	11.556 \| good	69.472 \| fine	33.822 \| good	0.532 \| good	6.053 \| good	0.237 \| good
2025-06-05T05:00:00.000Z	58 \| moderate	13.258 \| fine	50.793 \| good	38.796 \| good	0.538 \| good	7.756 \| good	0.285 \| good
2025-06-05T06:00:00.000Z	56 \| moderate	11.809 \| good	46.977 \| good	24.556 \| good	0.594 \| good	8.772 \| good	0.285 \| good
2025-06-05T07:00:00.000Z	58 \| moderate	12.565 \| fine	66.73 \| fine	35.94 \| good	0.583 \| good	8.414 \| good	0.285 \| good
2025-06-05T08:00:00.000Z	67 \| moderate	16.959 \| fine	88.236 \| fine	24.826 \| good	0.588 \| good	8.519 \| good	0.292 \| good
2025-06-05T09:00:00.000Z	89 \| moderate	9.22 \| good	132.277 \| fine	20.465 \| good	0.588 \| good	3.716 \| good	0.527 \| good
2025-06-05T10:00:00.000Z	33 \| good	5.783 \| good	21.334 \| good	22.083 \| good	0.536 \| good	3.783 \| good	0.398 \| good
2025-06-05T11:00:00.000Z	49 \| good	8.905 \| good	41.326 \| good	30.096 \| good	0.556 \| good	2.64 \| good	0.309 \| good
2025-06-05T12:00:00.000Z	34 \| good	5.325 \| good	37.073 \| good	30.331 \| good	0.561 \| good	3.474 \| good	0.308 \| good
2025-06-05T13:00:00.000Z	52 \| moderate	5.471 \| good	57.099 \| fine	24.582 \| good	0.563 \| good	5.075 \| good	0.308 \| good
2025-06-05T14:00:00.000Z	52 \| moderate	4.493 \| good	57.223 \| fine	24.521 \| good	0.524 \| good	4.991 \| good	0.308 \| good
2025-06-05T15:00:00.000Z	33 \| good	6.258 \| good	22.852 \| good	32.176 \| good	0.468 \| good	6.058 \| good	0.269 \| good
2025-06-05T16:00:00.000Z	33 \| good	5.644 \| good	25.253 \| good	30.852 \| good	0.502 \| good	4.08 \| good	0.263 \| good
2025-06-05T17:00:00.000Z	38 \| good	6.913 \| good	40.136 \| good	32.232 \| good	0.481 \| good	4.038 \| good	0.319 \| good
2025-06-05T18:00:00.000Z	46 \| good	4.975 \| good	50.38 \| good	35.774 \| good	0.366 \| good	4.014 \| good	0.313 \| good
2025-06-05T19:00:00.000Z	35 \| good	5.615 \| good	19.533 \| good	37.846 \| good	0.47 \| good	4.397 \| good	0.258 \| good
2025-06-05T20:00:00.000Z	38 \| good	6.265 \| good	31.187 \| good	41.119 \| good	0.47 \| good	5.136 \| good	0.252 \| good
2025-06-05T21:00:00.000Z	38 \| good	7.397 \| good	24.211 \| good	38.731 \| good	0.452 \| good	3.841 \| good	0.247 \| good
2025-06-05T22:00:00.000Z	44 \| good	8.462 \| good	33.231 \| good	41.159 \| good	0.486 \| good	3.547 \| good	0.247 \| good
2025-06-05T23:00:00.000Z	49 \| good	8.756 \| good	41.769 \| good	39.054 \| good	0.626 \| good	4.713 \| good	0.206 \| good
2025-06-06T00:00:00.000Z	52 \| moderate	9.674 \| good	32.218 \| good	41.327 \| good	0.579 \| good	4.917 \| good	0.293 \| good
2025-06-06T01:00:00.000Z	49 \| good	8.623 \| good	33.793 \| good	40.742 \| good	0.645 \| good	5.755 \| good	0.245 \| good
2025-06-06T02:00:00.000Z	42 \| good	7.439 \| good	26.43 \| good	44.825 \| good	0.575 \| good	7.777 \| good	0.298 \| good
2025-06-06T03:00:00.000Z	44 \| good	7.579 \| good	28.321 \| good	43.398 \| good	0.524 \| good	8.765 \| good	0.358 \| good
2025-06-06T04:00:00.000Z	44 \| good	7.832 \| good	28.845 \| good	30.111 \| good	0.516 \| good	10.474 \| good	0.388 \| good
2025-06-06T05:00:00.000Z	54 \| moderate	10.625 \| good	29.104 \| good	23.454 \| good	0.497 \| good	10.946 \| good	0.478 \| good
2025-06-06T06:00:00.000Z	49 \| good	9.277 \| good	49.441 \| good	15.965 \| good	0.421 \| good	13.376 \| good	0.555 \| good
2025-06-06T06:00:00.000Z	49 \| good	9.277 \| good	49.441 \| good	15.965 \| good	0.421 \| good	13.376 \| good	0.555 \| good
2025-06-06T07:00:00.000Z	44 \| good	7.735 \| good	33.819 \| good	20.453 \| good	0.87 \| good	12.871 \| good	0.328 \| good
2025-06-06T08:00:00.000Z	49 \| good	9.071 \| good	40.486 \| good	17.948 \| good	0.906 \| good	13.939 \| good	0.334 \| good
2025-06-06T09:00:00.000Z	49 \| good	9.232 \| good	40.762 \| good	14.875 \| good	0.941 \| good	15.008 \| good	0.34 \| good
2025-06-06T10:00:00.000Z	62 \| moderate	14.501 \| fine	64.81 \| fine	15.032 \| good	0.785 \| good	7.859 \| good	0.316 \| good
2025-06-06T11:00:00.000Z	64 \| moderate	15.823 \| fine	70.542 \| fine	13.832 \| good	0.826 \| good	8.608 \| good	0.323 \| good
2025-06-06T12:00:00.000Z	64 \| moderate	15.913 \| fine	70.7 \| fine	14.165 \| good	0.867 \| good	9.358 \| good	0.331 \| good
2025-06-06T13:00:00.000Z	60 \| moderate	13.823 \| fine	62.614 \| fine	20.755 \| good	1.812 \| good	3.157 \| good	0.258 \| good
2025-06-06T14:00:00.000Z	66 \| moderate	16.649 \| fine	73.347 \| fine	27.397 \| good	1.847 \| good	3.133 \| good	0.257 \| good
2025-06-06T15:00:00.000Z	64 \| moderate	16.492 \| fine	73.404 \| fine	33.805 \| good	1.883 \| good	3.108 \| good	0.256 \| good
2025-06-06T16:00:00.000Z	75 \| moderate	21.612 \| fine	94.827 \| fine	30.191 \| good	1.468 \| good	2.357 \| good	0.215 \| good
2025-06-06T17:00:00.000Z	81 \| moderate	25.077 \| fine	110.038 \| fine	30.299 \| good	1.468 \| good	2.329 \| good	0.215 \| good
2025-06-06T18:00:00.000Z	79 \| moderate	24.225 \| fine	105.954 \| fine	36.222 \| good	1.468 \| good	2.3 \| good	0.214 \| good
2025-06-06T19:00:00.000Z	75 \| moderate	22.397 \| fine	98.235 \| fine	37.834 \| good	1.253 \| good	2.339 \| good	0.213 \| good
2025-06-06T20:00:00.000Z	81 \| moderate	25.123 \| fine	109.472 \| fine	34.663 \| good	1.213 \| good	2.236 \| good	0.212 \| good
2025-06-06T21:00:00.000Z	75 \| moderate	22.464 \| fine	99.089 \| fine	30.807 \| good	1.174 \| good	2.134 \| good	0.212 \| good
2025-06-06T22:00:00.000Z	73 \| moderate	21.386 \| fine	93.703 \| fine	27.083 \| good	0.819 \| good	5.918 \| good	0.235 \| good
2025-06-06T23:00:00.000Z	67 \| moderate	18.376 \| fine	81.06 \| fine	24.698 \| good	0.763 \| good	5.646 \| good	0.231 \| good
2025-06-07T00:00:00.000Z	75 \| moderate	21.617 \| fine	95.421 \| fine	36.338 \| good	0.707 \| good	5.373 \| good	0.226 \| good
2025-06-07T01:00:00.000Z	64 \| moderate	16.276 \| fine	72.336 \| fine	34.547 \| good	0.826 \| good	13.047 \| good	0.283 \| good
2025-06-07T02:00:00.000Z	66 \| moderate	16.553 \| fine	72.883 \| fine	33.1 \| good	0.704 \| good	12.063 \| good	0.269 \| good
2025-06-07T03:00:00.000Z	64 \| moderate	16.148 \| fine	72.198 \| fine	28.897 \| good	0.582 \| good	11.078 \| good	0.255 \| good
2025-06-07T04:00:00.000Z	64 \| moderate	16.07 \| fine	71.172 \| fine	28.49 \| good	0.365 \| good	21.095 \| good	0.366 \| good
2025-06-07T05:00:00.000Z	64 \| moderate	15.604 \| fine	69.126 \| fine	27.785 \| good	0.36 \| good	20.27 \| good	0.349 \| good
2025-06-07T06:00:00.000Z	62 \| moderate	14.863 \| fine	66.628 \| fine	27.399 \| good	0.355 \| good	19.445 \| good	0.332 \| good
2025-06-07T07:00:00.000Z	56 \| moderate	12.441 \| fine	56.488 \| fine	26.326 \| good	0.261 \| good	10.545 \| good	0.312 \| good
2025-06-07T08:00:00.000Z	60 \| moderate	13.53 \| fine	60.589 \| fine	26.898 \| good	0.275 \| good	10.513 \| good	0.303 \| good
2025-06-07T09:00:00.000Z	58 \| moderate	12.553 \| fine	56.498 \| fine	28.456 \| good	0.288 \| good	10.481 \| good	0.295 \| good
2025-06-07T10:00:00.000Z	58 \| moderate	12.842 \| fine	58.245 \| fine	31.455 \| good	0.251 \| good	6.209 \| good	0.283 \| good
2025-06-07T11:00:00.000Z	56 \| moderate	12.045 \| good	54.105 \| good	31.116 \| good	0.274 \| good	6.457 \| good	0.284 \| good
2025-06-07T12:00:00.000Z	58 \| moderate	12.927 \| fine	58.014 \| fine	26.69 \| good	0.297 \| good	6.706 \| good	0.284 \| good
2025-06-07T13:00:00.000Z	58 \| moderate	13.036 \| fine	58.584 \| fine	23.534 \| good	0.889 \| good	3.918 \| good	0.264 \| good
2025-06-07T14:00:00.000Z	58 \| moderate	13.351 \| fine	60.299 \| fine	24.269 \| good	0.837 \| good	3.776 \| good	0.262 \| good
2025-06-07T15:00:00.000Z	60 \| moderate	14.242 \| fine	63.079 \| fine	24.321 \| good	0.786 \| good	3.635 \| good	0.261 \| good
2025-06-07T16:00:00.000Z	62 \| moderate	14.952 \| fine	66.691 \| fine	26.436 \| good	1.051 \| good	2.343 \| good	0.223 \| good
2025-06-07T17:00:00.000Z	62 \| moderate	15.239 \| fine	68.683 \| fine	29.584 \| good	0.949 \| good	2.177 \| good	0.221 \| good
2025-06-07T18:00:00.000Z	56 \| moderate	12.216 \| fine	55.127 \| fine	37.793 \| good	0.847 \| good	2.01 \| good	0.219 \| good
2025-06-07T19:00:00.000Z	40 \| good	5.37 \| good	23.288 \| good	43.132 \| good	1.014 \| good	2.076 \| good	0.209 \| good
2025-06-07T20:00:00.000Z	37 \| good	5.02 \| good	21.482 \| good	39.983 \| good	0.96 \| good	2.062 \| good	0.208 \| good
2025-06-07T21:00:00.000Z	42 \| good	1.989 \| good	8.25 \| good	44.928 \| good	0.905 \| good	2.048 \| good	0.208 \| good
2025-06-07T22:00:00.000Z	45 \| good	0.972 \| good	3.976 \| good	49.219 \| good	0.623 \| good	4.47 \| good	0.213 \| good
2025-06-07T23:00:00.000Z	44 \| good	2.065 \| good	8.077 \| good	47.135 \| good	0.621 \| good	4.33 \| good	0.213 \| good
2025-06-08T00:00:00.000Z	44 \| good	4.251 \| good	18.881 \| good	48.364 \| good	0.62 \| good	4.191 \| good	0.214 \| good
2025-06-08T01:00:00.000Z	38 \| good	4.354 \| good	19.05 \| good	40.791 \| good	0.568 \| good	4.736 \| good	0.195 \| good
2025-06-08T02:00:00.000Z	34 \| good	5.429 \| good	23.379 \| good	37.499 \| good	0.583 \| good	4.845 \| good	0.201 \| good
2025-06-08T03:00:00.000Z	33 \| good	6.457 \| good	28.46 \| good	33.684 \| good	0.599 \| good	4.953 \| good	0.206 \| good
2025-06-08T04:00:00.000Z	49 \| good	8.636 \| good	37.844 \| good	34.502 \| good	0.45 \| good	2.846 \| good	0.168 \| good
2025-06-08T05:00:00.000Z	54 \| moderate	10.585 \| good	47.066 \| good	34.162 \| good	0.494 \| good	2.905 \| good	0.167 \| good
2025-06-08T06:00:00.000Z	29 \| good	1.937 \| good	1.997 \| good	31.189 \| good	0.541 \| good	3 \| good	0.167 \| good

O'Fallon

Get reliable air quality data to drive your business

O'Fallon, Illinois air quality map: Track AQI near you

0.48ppm

How accurate is Illinois, USA air quality data?

Air quality data and pollutant measurements for Illinois, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.

Source: Ambee Data Sources

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Frequently asked questions

How often is the air quality data for O'fallon, Illinois updated?

The air quality for O'fallon, Illinois is updated every hour.

When was the worst air quality at O'fallon, Illinois in the last 24 hrs?

The worst air quality in O'fallon, Illinois in the last 24 hours was observed at 09:00:00 on 2025-06-05.

When was the best air quality at O'fallon, Illinois in the last 24 hrs?

In the last 24 hrs, the best air quality in O'fallon, Illinois was observed at 04:00:00 on 2025-06-05.

What is the current air quality in O'fallon, Illinois?

The current air quality in O'fallon, Illinois is 49, categorized as Good based on real-time data.

What pollutant is the most common in O'fallon, Illinois?

The most common pollutant in O'fallon, Illinois is PM2.5.

What should I do if the air quality in O'fallon, Illinois is poor?

If the air quality in O'fallon, Illinois is poor, consider staying indoors and wearing a mask to protect yourself.

What is the current concentration of PM_2.5 in O'fallon, Illinois?

The current PM_2.5 concentration at O'fallon, Illinois is 9.277 μg/m³.

What is the current concentration of PM₁₀ in O'fallon, Illinois?

The current PM₁₀ concentration at O'fallon, Illinois is 49.441 μg/m³.

What is the current concentration of carbon monoxide (CO) in O'fallon, Illinois?

The current carbon monoxide (CO) concentration at O'fallon, Illinois is 0.555 ppm.

What is the current concentration of sulfur dioxide (SO₂) in O'fallon, Illinois?

The current sulfur dioxide (SO₂) concentration at O'fallon, Illinois is 0.421 ppb.

What is the current concentration of ozone (O₃) in O'fallon, Illinois?

The current ozone (O₃) concentration at O'fallon, Illinois is 15.965 ppm.

What is the current concentration of nitrogen dioxide (NO₂) in O'fallon, Illinois?

The current nitrogen dioxide (NO₂) concentration at O'fallon, Illinois is 13.376 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-06-04T07:00:00.000Z	67 \| moderate	18.118 \| fine	74.003 \| fine	37.284 \| good	0.817 \| good	6.291 \| good	0.263 \| good
2025-06-04T08:00:00.000Z	62 \| moderate	14.667 \| fine	58.832 \| fine	36.945 \| good	0.822 \| good	6.3 \| good	0.257 \| good
2025-06-04T09:00:00.000Z	59 \| moderate	9.128 \| good	71.524 \| fine	38.734 \| good	0.73 \| good	2.8 \| good	0.139 \| good
2025-06-04T10:00:00.000Z	67 \| moderate	18.118 \| fine	69.181 \| fine	32.833 \| good	0.491 \| good	4.022 \| good	0.174 \| good
2025-06-04T11:00:00.000Z	54 \| moderate	10.915 \| good	43.171 \| good	33.546 \| good	0.45 \| good	10.783 \| good	0.186 \| good
2025-06-04T12:00:00.000Z	47 \| good	3.519 \| good	51.078 \| good	35.674 \| good	0.563 \| good	14.178 \| good	0.257 \| good
2025-06-04T13:00:00.000Z	54 \| moderate	10.651 \| good	46.995 \| good	26.084 \| good	0.536 \| good	3.424 \| good	0.218 \| good
2025-06-04T14:00:00.000Z	38 \| good	6.646 \| good	13.152 \| good	30.734 \| good	0.537 \| good	21.952 \| good	0.319 \| good
2025-06-04T15:00:00.000Z	44 \| good	8.364 \| good	39.434 \| good	34.686 \| good	0.609 \| good	16.57 \| good	0.31 \| good
2025-06-04T16:00:00.000Z	49 \| good	8.641 \| good	43.498 \| good	28.692 \| good	0.498 \| good	10.557 \| good	0.296 \| good
2025-06-04T17:00:00.000Z	58 \| moderate	12.982 \| fine	61.638 \| fine	31.883 \| good	0.501 \| good	7.665 \| good	0.292 \| good
2025-06-04T18:00:00.000Z	56 \| moderate	12.485 \| fine	31.486 \| good	36.582 \| good	0.584 \| good	5.491 \| good	0.264 \| good
2025-06-04T19:00:00.000Z	58 \| moderate	12.954 \| fine	53.969 \| good	36.893 \| good	0.647 \| good	4.515 \| good	0.269 \| good
2025-06-04T20:00:00.000Z	62 \| moderate	15.091 \| fine	60.479 \| fine	39.9 \| good	0.629 \| good	6.352 \| good	0.287 \| good
2025-06-04T21:00:00.000Z	54 \| moderate	10.755 \| good	45.774 \| good	38.884 \| good	0.455 \| good	6.115 \| good	0.258 \| good
2025-06-04T22:00:00.000Z	49 \| good	9.152 \| good	33.012 \| good	37.179 \| good	0.471 \| good	6.489 \| good	0.175 \| good
2025-06-04T23:00:00.000Z	33 \| good	6.421 \| good	32.296 \| good	33.107 \| good	0.434 \| good	6.983 \| good	0.258 \| good
2025-06-05T00:00:00.000Z	32 \| good	3.727 \| good	17.43 \| good	34.972 \| good	0.48 \| good	8.206 \| good	0.243 \| good
2025-06-05T01:00:00.000Z	38 \| good	6.677 \| good	28.852 \| good	31.634 \| good	0.49 \| good	5.796 \| good	0.278 \| good
2025-06-05T02:00:00.000Z	49 \| good	9.442 \| good	44.223 \| good	33.334 \| good	0.46 \| good	7.545 \| good	0.25 \| good
2025-06-05T03:00:00.000Z	49 \| good	8.924 \| good	25.793 \| good	34.556 \| good	0.51 \| good	6.116 \| good	0.248 \| good
2025-06-05T04:00:00.000Z	58 \| moderate	11.556 \| good	69.472 \| fine	33.822 \| good	0.532 \| good	6.053 \| good	0.237 \| good
2025-06-05T05:00:00.000Z	58 \| moderate	13.258 \| fine	50.793 \| good	38.796 \| good	0.538 \| good	7.756 \| good	0.285 \| good
2025-06-05T06:00:00.000Z	56 \| moderate	11.809 \| good	46.977 \| good	24.556 \| good	0.594 \| good	8.772 \| good	0.285 \| good
2025-06-05T07:00:00.000Z	58 \| moderate	12.565 \| fine	66.73 \| fine	35.94 \| good	0.583 \| good	8.414 \| good	0.285 \| good
2025-06-05T08:00:00.000Z	67 \| moderate	16.959 \| fine	88.236 \| fine	24.826 \| good	0.588 \| good	8.519 \| good	0.292 \| good
2025-06-05T09:00:00.000Z	89 \| moderate	9.22 \| good	132.277 \| fine	20.465 \| good	0.588 \| good	3.716 \| good	0.527 \| good
2025-06-05T10:00:00.000Z	33 \| good	5.783 \| good	21.334 \| good	22.083 \| good	0.536 \| good	3.783 \| good	0.398 \| good
2025-06-05T11:00:00.000Z	49 \| good	8.905 \| good	41.326 \| good	30.096 \| good	0.556 \| good	2.64 \| good	0.309 \| good
2025-06-05T12:00:00.000Z	34 \| good	5.325 \| good	37.073 \| good	30.331 \| good	0.561 \| good	3.474 \| good	0.308 \| good
2025-06-05T13:00:00.000Z	52 \| moderate	5.471 \| good	57.099 \| fine	24.582 \| good	0.563 \| good	5.075 \| good	0.308 \| good
2025-06-05T14:00:00.000Z	52 \| moderate	4.493 \| good	57.223 \| fine	24.521 \| good	0.524 \| good	4.991 \| good	0.308 \| good
2025-06-05T15:00:00.000Z	33 \| good	6.258 \| good	22.852 \| good	32.176 \| good	0.468 \| good	6.058 \| good	0.269 \| good
2025-06-05T16:00:00.000Z	33 \| good	5.644 \| good	25.253 \| good	30.852 \| good	0.502 \| good	4.08 \| good	0.263 \| good
2025-06-05T17:00:00.000Z	38 \| good	6.913 \| good	40.136 \| good	32.232 \| good	0.481 \| good	4.038 \| good	0.319 \| good
2025-06-05T18:00:00.000Z	46 \| good	4.975 \| good	50.38 \| good	35.774 \| good	0.366 \| good	4.014 \| good	0.313 \| good
2025-06-05T19:00:00.000Z	35 \| good	5.615 \| good	19.533 \| good	37.846 \| good	0.47 \| good	4.397 \| good	0.258 \| good
2025-06-05T20:00:00.000Z	38 \| good	6.265 \| good	31.187 \| good	41.119 \| good	0.47 \| good	5.136 \| good	0.252 \| good
2025-06-05T21:00:00.000Z	38 \| good	7.397 \| good	24.211 \| good	38.731 \| good	0.452 \| good	3.841 \| good	0.247 \| good
2025-06-05T22:00:00.000Z	44 \| good	8.462 \| good	33.231 \| good	41.159 \| good	0.486 \| good	3.547 \| good	0.247 \| good
2025-06-05T23:00:00.000Z	49 \| good	8.756 \| good	41.769 \| good	39.054 \| good	0.626 \| good	4.713 \| good	0.206 \| good
2025-06-06T00:00:00.000Z	52 \| moderate	9.674 \| good	32.218 \| good	41.327 \| good	0.579 \| good	4.917 \| good	0.293 \| good
2025-06-06T01:00:00.000Z	49 \| good	8.623 \| good	33.793 \| good	40.742 \| good	0.645 \| good	5.755 \| good	0.245 \| good
2025-06-06T02:00:00.000Z	42 \| good	7.439 \| good	26.43 \| good	44.825 \| good	0.575 \| good	7.777 \| good	0.298 \| good
2025-06-06T03:00:00.000Z	44 \| good	7.579 \| good	28.321 \| good	43.398 \| good	0.524 \| good	8.765 \| good	0.358 \| good
2025-06-06T04:00:00.000Z	44 \| good	7.832 \| good	28.845 \| good	30.111 \| good	0.516 \| good	10.474 \| good	0.388 \| good
2025-06-06T05:00:00.000Z	54 \| moderate	10.625 \| good	29.104 \| good	23.454 \| good	0.497 \| good	10.946 \| good	0.478 \| good
2025-06-06T06:00:00.000Z	49 \| good	9.277 \| good	49.441 \| good	15.965 \| good	0.421 \| good	13.376 \| good	0.555 \| good
2025-06-06T06:00:00.000Z	49 \| good	9.277 \| good	49.441 \| good	15.965 \| good	0.421 \| good	13.376 \| good	0.555 \| good
2025-06-06T07:00:00.000Z	44 \| good	7.735 \| good	33.819 \| good	20.453 \| good	0.87 \| good	12.871 \| good	0.328 \| good
2025-06-06T08:00:00.000Z	49 \| good	9.071 \| good	40.486 \| good	17.948 \| good	0.906 \| good	13.939 \| good	0.334 \| good
2025-06-06T09:00:00.000Z	49 \| good	9.232 \| good	40.762 \| good	14.875 \| good	0.941 \| good	15.008 \| good	0.34 \| good
2025-06-06T10:00:00.000Z	62 \| moderate	14.501 \| fine	64.81 \| fine	15.032 \| good	0.785 \| good	7.859 \| good	0.316 \| good
2025-06-06T11:00:00.000Z	64 \| moderate	15.823 \| fine	70.542 \| fine	13.832 \| good	0.826 \| good	8.608 \| good	0.323 \| good
2025-06-06T12:00:00.000Z	64 \| moderate	15.913 \| fine	70.7 \| fine	14.165 \| good	0.867 \| good	9.358 \| good	0.331 \| good
2025-06-06T13:00:00.000Z	60 \| moderate	13.823 \| fine	62.614 \| fine	20.755 \| good	1.812 \| good	3.157 \| good	0.258 \| good
2025-06-06T14:00:00.000Z	66 \| moderate	16.649 \| fine	73.347 \| fine	27.397 \| good	1.847 \| good	3.133 \| good	0.257 \| good
2025-06-06T15:00:00.000Z	64 \| moderate	16.492 \| fine	73.404 \| fine	33.805 \| good	1.883 \| good	3.108 \| good	0.256 \| good
2025-06-06T16:00:00.000Z	75 \| moderate	21.612 \| fine	94.827 \| fine	30.191 \| good	1.468 \| good	2.357 \| good	0.215 \| good
2025-06-06T17:00:00.000Z	81 \| moderate	25.077 \| fine	110.038 \| fine	30.299 \| good	1.468 \| good	2.329 \| good	0.215 \| good
2025-06-06T18:00:00.000Z	79 \| moderate	24.225 \| fine	105.954 \| fine	36.222 \| good	1.468 \| good	2.3 \| good	0.214 \| good
2025-06-06T19:00:00.000Z	75 \| moderate	22.397 \| fine	98.235 \| fine	37.834 \| good	1.253 \| good	2.339 \| good	0.213 \| good
2025-06-06T20:00:00.000Z	81 \| moderate	25.123 \| fine	109.472 \| fine	34.663 \| good	1.213 \| good	2.236 \| good	0.212 \| good
2025-06-06T21:00:00.000Z	75 \| moderate	22.464 \| fine	99.089 \| fine	30.807 \| good	1.174 \| good	2.134 \| good	0.212 \| good
2025-06-06T22:00:00.000Z	73 \| moderate	21.386 \| fine	93.703 \| fine	27.083 \| good	0.819 \| good	5.918 \| good	0.235 \| good
2025-06-06T23:00:00.000Z	67 \| moderate	18.376 \| fine	81.06 \| fine	24.698 \| good	0.763 \| good	5.646 \| good	0.231 \| good
2025-06-07T00:00:00.000Z	75 \| moderate	21.617 \| fine	95.421 \| fine	36.338 \| good	0.707 \| good	5.373 \| good	0.226 \| good
2025-06-07T01:00:00.000Z	64 \| moderate	16.276 \| fine	72.336 \| fine	34.547 \| good	0.826 \| good	13.047 \| good	0.283 \| good
2025-06-07T02:00:00.000Z	66 \| moderate	16.553 \| fine	72.883 \| fine	33.1 \| good	0.704 \| good	12.063 \| good	0.269 \| good
2025-06-07T03:00:00.000Z	64 \| moderate	16.148 \| fine	72.198 \| fine	28.897 \| good	0.582 \| good	11.078 \| good	0.255 \| good
2025-06-07T04:00:00.000Z	64 \| moderate	16.07 \| fine	71.172 \| fine	28.49 \| good	0.365 \| good	21.095 \| good	0.366 \| good
2025-06-07T05:00:00.000Z	64 \| moderate	15.604 \| fine	69.126 \| fine	27.785 \| good	0.36 \| good	20.27 \| good	0.349 \| good
2025-06-07T06:00:00.000Z	62 \| moderate	14.863 \| fine	66.628 \| fine	27.399 \| good	0.355 \| good	19.445 \| good	0.332 \| good
2025-06-07T07:00:00.000Z	56 \| moderate	12.441 \| fine	56.488 \| fine	26.326 \| good	0.261 \| good	10.545 \| good	0.312 \| good
2025-06-07T08:00:00.000Z	60 \| moderate	13.53 \| fine	60.589 \| fine	26.898 \| good	0.275 \| good	10.513 \| good	0.303 \| good
2025-06-07T09:00:00.000Z	58 \| moderate	12.553 \| fine	56.498 \| fine	28.456 \| good	0.288 \| good	10.481 \| good	0.295 \| good
2025-06-07T10:00:00.000Z	58 \| moderate	12.842 \| fine	58.245 \| fine	31.455 \| good	0.251 \| good	6.209 \| good	0.283 \| good
2025-06-07T11:00:00.000Z	56 \| moderate	12.045 \| good	54.105 \| good	31.116 \| good	0.274 \| good	6.457 \| good	0.284 \| good
2025-06-07T12:00:00.000Z	58 \| moderate	12.927 \| fine	58.014 \| fine	26.69 \| good	0.297 \| good	6.706 \| good	0.284 \| good
2025-06-07T13:00:00.000Z	58 \| moderate	13.036 \| fine	58.584 \| fine	23.534 \| good	0.889 \| good	3.918 \| good	0.264 \| good
2025-06-07T14:00:00.000Z	58 \| moderate	13.351 \| fine	60.299 \| fine	24.269 \| good	0.837 \| good	3.776 \| good	0.262 \| good
2025-06-07T15:00:00.000Z	60 \| moderate	14.242 \| fine	63.079 \| fine	24.321 \| good	0.786 \| good	3.635 \| good	0.261 \| good
2025-06-07T16:00:00.000Z	62 \| moderate	14.952 \| fine	66.691 \| fine	26.436 \| good	1.051 \| good	2.343 \| good	0.223 \| good
2025-06-07T17:00:00.000Z	62 \| moderate	15.239 \| fine	68.683 \| fine	29.584 \| good	0.949 \| good	2.177 \| good	0.221 \| good
2025-06-07T18:00:00.000Z	56 \| moderate	12.216 \| fine	55.127 \| fine	37.793 \| good	0.847 \| good	2.01 \| good	0.219 \| good
2025-06-07T19:00:00.000Z	40 \| good	5.37 \| good	23.288 \| good	43.132 \| good	1.014 \| good	2.076 \| good	0.209 \| good
2025-06-07T20:00:00.000Z	37 \| good	5.02 \| good	21.482 \| good	39.983 \| good	0.96 \| good	2.062 \| good	0.208 \| good
2025-06-07T21:00:00.000Z	42 \| good	1.989 \| good	8.25 \| good	44.928 \| good	0.905 \| good	2.048 \| good	0.208 \| good
2025-06-07T22:00:00.000Z	45 \| good	0.972 \| good	3.976 \| good	49.219 \| good	0.623 \| good	4.47 \| good	0.213 \| good
2025-06-07T23:00:00.000Z	44 \| good	2.065 \| good	8.077 \| good	47.135 \| good	0.621 \| good	4.33 \| good	0.213 \| good
2025-06-08T00:00:00.000Z	44 \| good	4.251 \| good	18.881 \| good	48.364 \| good	0.62 \| good	4.191 \| good	0.214 \| good
2025-06-08T01:00:00.000Z	38 \| good	4.354 \| good	19.05 \| good	40.791 \| good	0.568 \| good	4.736 \| good	0.195 \| good
2025-06-08T02:00:00.000Z	34 \| good	5.429 \| good	23.379 \| good	37.499 \| good	0.583 \| good	4.845 \| good	0.201 \| good
2025-06-08T03:00:00.000Z	33 \| good	6.457 \| good	28.46 \| good	33.684 \| good	0.599 \| good	4.953 \| good	0.206 \| good
2025-06-08T04:00:00.000Z	49 \| good	8.636 \| good	37.844 \| good	34.502 \| good	0.45 \| good	2.846 \| good	0.168 \| good
2025-06-08T05:00:00.000Z	54 \| moderate	10.585 \| good	47.066 \| good	34.162 \| good	0.494 \| good	2.905 \| good	0.167 \| good
2025-06-08T06:00:00.000Z	29 \| good	1.937 \| good	1.997 \| good	31.189 \| good	0.541 \| good	3 \| good	0.167 \| good

Live air quality index in O'Fallon, Illinois today

Major air pollutants in O'Fallon, Illinois

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

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Air quality in nearby cities

O'Fallon, Illinois

Shiloh, Illinois

Fairview Heights, Illinois

Swansea, Illinois

Belleville, Illinois

Collinsville, Illinois

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Frequently asked questions

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Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

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What is the current concentration of ozone (O₃) in O'fallon, Illinois?

What is the current concentration of nitrogen dioxide (NO₂) in O'fallon, Illinois?