What is the current level of PM10 in St. Charles, Missouri?

St. Charles, Missouri currently has a PM10 concentration of 13.311 μg/m3.

What is the current level of sulfur dioxide (SO2) in St. Charles, Missouri?

The current sulfur dioxide (SO2) concentration in St. Charles, Missouri is 0.378 ppb.

What is the current level of ozone (O3) in St. Charles, Missouri?

St. Charles, Missouri currently has an ozone (O3) concentration of 30.725 ppm.

What is the current level of nitrogen dioxide (NO2) in St. Charles, Missouri?

The current level of nitrogen dioxide (NO2) in St. Charles, Missouri is 4.12 ppb.

Current air quality index in St. Charles, Missouri today

Q: What is the PM2.5 concentration in St. Charles, Missouri right now?

St. Charles, Missouri currently has a PM2.5 concentration of 2.406 μg/m3.

Stay updated with real-time air quality in St. Charles, Missouri 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

St. Charles, Missouri

Last updated: ... (Local time)

Common air pollutants in St. Charles, Missouri

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

2.41 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

13.31 μg/m³

155

255

425

605+

Ozone (O₃)

30.73 ppb

201

201+

Sulfur Dioxide (SO₂)

0.38 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

4.12 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.15 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

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St. Charles, Missouri

Scroll To Air Quality Map

Track live St. Charles, Missouri air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-01-21T16:00:00.000Z	54 \| moderate	10.85 \| good	43.774 \| good	28.372 \| good	1.624 \| good	12.193 \| good	0.248 \| good
2026-01-21T17:00:00.000Z	56 \| moderate	11.822 \| good	35.009 \| good	28.274 \| good	0.994 \| good	10.77 \| good	0.251 \| good
2026-01-21T18:00:00.000Z	54 \| moderate	10.881 \| good	49.819 \| good	29.25 \| good	1.003 \| good	10.797 \| good	0.248 \| good
2026-01-21T19:00:00.000Z	52 \| moderate	9.973 \| good	42.107 \| good	29.574 \| good	1.001 \| good	8.939 \| good	0.248 \| good
2026-01-21T20:00:00.000Z	49 \| good	9.046 \| good	36.557 \| good	30.133 \| good	0.875 \| good	8.969 \| good	0.248 \| good
2026-01-21T21:00:00.000Z	38 \| good	7.272 \| good	34.087 \| good	29.247 \| good	0.769 \| good	7.89 \| good	0.193 \| good
2026-01-21T22:00:00.000Z	30 \| good	5.483 \| good	23.173 \| good	31.955 \| good	0.861 \| good	10.813 \| good	0.196 \| good
2026-01-21T23:00:00.000Z	29 \| good	4.969 \| good	21.732 \| good	30.507 \| good	1.144 \| good	10.324 \| good	0.251 \| good
2026-01-22T00:00:00.000Z	31 \| good	4.116 \| good	15.569 \| good	33.663 \| good	1.411 \| good	14.344 \| good	0.251 \| good
2026-01-22T01:00:00.000Z	24 \| good	4.063 \| good	19.252 \| good	26.407 \| good	1.208 \| good	18.199 \| good	0.337 \| good
2026-01-22T02:00:00.000Z	22 \| good	4.092 \| good	19.42 \| good	24.03 \| good	0.716 \| good	11.745 \| good	0.303 \| good
2026-01-22T03:00:00.000Z	55 \| moderate	11.423 \| good	63.722 \| fine	24.823 \| good	2.643 \| good	9.531 \| good	0.251 \| good
2026-01-22T04:00:00.000Z	27 \| good	4.655 \| good	28.91 \| good	23.181 \| good	0.634 \| good	5.775 \| good	0.196 \| good
2026-01-22T05:00:00.000Z	23 \| good	4.1 \| good	18.584 \| good	25.368 \| good	0.389 \| good	2.178 \| good	0.113 \| good
2026-01-22T06:00:00.000Z	24 \| good	3.138 \| good	24.056 \| good	26.107 \| good	0.295 \| good	2.313 \| good	0.106 \| good
2026-01-22T07:00:00.000Z	19 \| good	3.083 \| good	21.335 \| good	20.18 \| good	0.294 \| good	2.316 \| good	0.113 \| good
2026-01-22T08:00:00.000Z	16 \| good	2.726 \| good	13.593 \| good	14.358 \| good	0.294 \| good	2.319 \| good	0.113 \| good
2026-01-22T09:00:00.000Z	16 \| good	2.554 \| good	15.39 \| good	11.609 \| good	0.387 \| good	2.538 \| good	0.103 \| good
2026-01-22T10:00:00.000Z	17 \| good	1.713 \| good	18.474 \| good	15.5 \| good	0.293 \| good	9.599 \| good	0.103 \| good
2026-01-22T11:00:00.000Z	20 \| good	1.271 \| good	3.945 \| good	20.712 \| good	0.485 \| good	20.948 \| good	0.1 \| good
2026-01-22T12:00:00.000Z	25 \| good	1.335 \| good	8.159 \| good	14.986 \| good	1.141 \| good	27.363 \| good	0.245 \| good
2026-01-22T13:00:00.000Z	28 \| good	2.549 \| good	12.307 \| good	14.026 \| good	0.953 \| good	29.918 \| good	0.227 \| good
2026-01-22T14:00:00.000Z	31 \| good	3.793 \| good	13.894 \| good	10.9 \| good	1.052 \| good	33.497 \| good	0.505 \| good
2026-01-22T15:00:00.000Z	27 \| good	4.008 \| good	16.363 \| good	19.511 \| good	1.155 \| good	29.34 \| good	0.451 \| good
2026-01-22T16:00:00.000Z	23 \| good	2.595 \| good	12.638 \| good	25.171 \| good	0.79 \| good	20.856 \| good	0.337 \| good
2026-01-22T17:00:00.000Z	25 \| good	1.891 \| good	9.575 \| good	26.662 \| good	0.768 \| good	14.768 \| good	0.282 \| good
2026-01-22T18:00:00.000Z	28 \| good	2.757 \| good	13.035 \| good	30.22 \| good	0.68 \| good	7.2 \| good	0.193 \| good
2026-01-22T19:00:00.000Z	29 \| good	3.277 \| good	12.585 \| good	30.976 \| good	0.299 \| good	3.863 \| good	0.193 \| good
2026-01-22T20:00:00.000Z	29 \| good	0.928 \| good	9.393 \| good	31.376 \| good	0.299 \| good	7.727 \| good	0.193 \| good
2026-01-22T21:00:00.000Z	29 \| good	1.616 \| good	7.611 \| good	31.354 \| good	0.389 \| good	7.148 \| good	0.193 \| good
2026-01-22T22:00:00.000Z	30 \| good	1.778 \| good	18.02 \| good	31.982 \| good	0.575 \| good	13.637 \| good	0.193 \| good
2026-01-22T23:00:00.000Z	29 \| good	1.918 \| good	11.098 \| good	30.795 \| good	0.58 \| good	10.885 \| good	0.196 \| good
2026-01-23T00:00:00.000Z	28 \| good	3.454 \| good	26.433 \| good	29.805 \| good	0.487 \| good	10.859 \| good	0.23 \| good
2026-01-23T01:00:00.000Z	27 \| good	4.85 \| good	28.037 \| good	24.683 \| good	0.597 \| good	9.156 \| good	0.292 \| good
2026-01-23T02:00:00.000Z	33 \| good	5.823 \| good	22.769 \| good	22.311 \| good	0.694 \| good	19.363 \| good	0.333 \| good
2026-01-23T03:00:00.000Z	44 \| good	7.706 \| good	22.14 \| good	14.428 \| good	0.604 \| good	21.34 \| good	0.329 \| good
2026-01-23T04:00:00.000Z	49 \| good	9.032 \| good	23.297 \| good	11.767 \| good	0.973 \| good	37.691 \| good	0.508 \| good
2026-01-23T05:00:00.000Z	54 \| moderate	10.856 \| good	22.263 \| good	12.03 \| good	1.07 \| good	35.782 \| good	0.563 \| good
2026-01-23T06:00:00.000Z	56 \| moderate	12.348 \| fine	57.582 \| fine	14.93 \| good	0.785 \| good	11.59 \| good	0.388 \| good
2026-01-23T07:00:00.000Z	52 \| moderate	9.783 \| good	40.743 \| good	11.391 \| good	0.785 \| good	11.511 \| good	0.384 \| good
2026-01-23T08:00:00.000Z	52 \| moderate	9.77 \| good	38.308 \| good	14.527 \| good	0.786 \| good	11.416 \| good	0.381 \| good
2026-01-23T09:00:00.000Z	30 \| good	4.82 \| good	32.071 \| good	15.654 \| good	0.487 \| good	2.271 \| good	0.106 \| good
2026-01-23T10:00:00.000Z	22 \| good	4.241 \| good	10.585 \| good	19.951 \| good	0.401 \| good	2.437 \| good	0.158 \| good
2026-01-23T11:00:00.000Z	26 \| good	2.829 \| good	23.045 \| good	27.896 \| good	0.495 \| good	2.91 \| good	0.1 \| good
2026-01-23T12:00:00.000Z	27 \| good	1.911 \| good	9.61 \| good	28.543 \| good	0.485 \| good	3.119 \| good	0.1 \| good
2026-01-23T13:00:00.000Z	26 \| good	2.399 \| good	12.352 \| good	28.49 \| good	0.391 \| good	3.398 \| good	0.1 \| good
2026-01-23T14:00:00.000Z	29 \| good	2.175 \| good	11.84 \| good	30.6 \| good	0.39 \| good	3.752 \| good	0.155 \| good
2026-01-23T15:00:00.000Z	29 \| good	2.406 \| good	13.311 \| good	30.725 \| good	0.378 \| good	4.12 \| good	0.155 \| good
2026-01-23T16:00:00.000Z	17 \| good	2.62 \| good	10.923 \| good	18.4 \| good	0.452 \| good	1.638 \| good	0.173 \| good
2026-01-23T17:00:00.000Z	17 \| good	1.962 \| good	8.029 \| good	17.954 \| good	0.469 \| good	1.431 \| good	0.17 \| good
2026-01-23T18:00:00.000Z	17 \| good	2.386 \| good	9.923 \| good	17.525 \| good	0.486 \| good	1.225 \| good	0.168 \| good
2026-01-23T19:00:00.000Z	18 \| good	2.733 \| good	11.212 \| good	19.264 \| good	0.501 \| good	1.35 \| good	0.166 \| good
2026-01-23T20:00:00.000Z	19 \| good	2.488 \| good	10 \| good	21.383 \| good	0.515 \| good	1.475 \| good	0.165 \| good
2026-01-23T21:00:00.000Z	22 \| good	2.095 \| good	8.711 \| good	23.503 \| good	0.53 \| good	1.601 \| good	0.164 \| good
2026-01-23T22:00:00.000Z	20 \| good	1.165 \| good	4.858 \| good	22.166 \| good	0.551 \| good	2.235 \| good	0.165 \| good
2026-01-23T23:00:00.000Z	19 \| good	2.107 \| good	8.86 \| good	19.653 \| good	0.572 \| good	2.87 \| good	0.167 \| good
2026-01-24T00:00:00.000Z	17 \| good	1.955 \| good	8 \| good	18.173 \| good	0.592 \| good	3.505 \| good	0.168 \| good
2026-01-24T01:00:00.000Z	12 \| good	2.027 \| good	8.127 \| good	13.157 \| good	0.629 \| good	3.568 \| good	0.168 \| good
2026-01-24T02:00:00.000Z	22 \| good	3.713 \| good	16.029 \| good	10.065 \| good	0.666 \| good	3.631 \| good	0.167 \| good
2026-01-24T03:00:00.000Z	27 \| good	5.101 \| good	22.005 \| good	12.22 \| good	0.703 \| good	3.694 \| good	0.166 \| good
2026-01-24T04:00:00.000Z	27 \| good	4.723 \| good	20.806 \| good	12.562 \| good	0.748 \| good	3.59 \| good	0.166 \| good
2026-01-24T05:00:00.000Z	22 \| good	3.908 \| good	16.971 \| good	14.227 \| good	0.792 \| good	3.486 \| good	0.165 \| good
2026-01-24T06:00:00.000Z	22 \| good	3.589 \| good	16 \| good	15.241 \| good	0.837 \| good	3.383 \| good	0.164 \| good
2026-01-24T07:00:00.000Z	22 \| good	3.663 \| good	16 \| good	12.959 \| good	0.856 \| good	3.303 \| good	0.164 \| good
2026-01-24T08:00:00.000Z	16 \| good	3.015 \| good	12.058 \| good	11.215 \| good	0.875 \| good	3.224 \| good	0.163 \| good
2026-01-24T09:00:00.000Z	14 \| good	2.301 \| good	9.737 \| good	15.062 \| good	0.894 \| good	3.144 \| good	0.163 \| good
2026-01-24T10:00:00.000Z	16 \| good	1.846 \| good	7.737 \| good	17.024 \| good	0.865 \| good	3.108 \| good	0.163 \| good
2026-01-24T11:00:00.000Z	15 \| good	2.482 \| good	10.02 \| good	16.201 \| good	0.836 \| good	3.072 \| good	0.163 \| good
2026-01-24T12:00:00.000Z	14 \| good	2.262 \| good	9.022 \| good	15.354 \| good	0.808 \| good	3.036 \| good	0.163 \| good
2026-01-24T13:00:00.000Z	33 \| good	5.716 \| good	24.899 \| good	14.362 \| good	0.821 \| good	3.47 \| good	0.166 \| good
2026-01-24T14:00:00.000Z	33 \| good	6.06 \| good	26.761 \| good	12.821 \| good	0.834 \| good	3.904 \| good	0.169 \| good
2026-01-24T15:00:00.000Z	44 \| good	8.181 \| good	35.98 \| good	9.612 \| good	0.847 \| good	4.338 \| good	0.173 \| good
2026-01-24T16:00:00.000Z	38 \| good	7.383 \| good	32.203 \| good	12.283 \| good	0.892 \| good	4.183 \| good	0.172 \| good
2026-01-24T17:00:00.000Z	27 \| good	5.497 \| good	23.851 \| good	15.258 \| good	0.936 \| good	4.028 \| good	0.171 \| good
2026-01-24T18:00:00.000Z	33 \| good	6.432 \| good	28.829 \| good	17.68 \| good	0.981 \| good	3.873 \| good	0.17 \| good
2026-01-24T19:00:00.000Z	33 \| good	6.439 \| good	28.853 \| good	17.868 \| good	1.008 \| good	4.151 \| good	0.172 \| good
2026-01-24T20:00:00.000Z	38 \| good	6.812 \| good	30.051 \| good	19.218 \| good	1.036 \| good	4.429 \| good	0.173 \| good
2026-01-24T21:00:00.000Z	33 \| good	5.582 \| good	23.9 \| good	21.005 \| good	1.064 \| good	4.707 \| good	0.175 \| good
2026-01-24T22:00:00.000Z	19 \| good	2.889 \| good	11.913 \| good	20.306 \| good	1.031 \| good	5.423 \| good	0.178 \| good
2026-01-24T23:00:00.000Z	20 \| good	2.119 \| good	8.734 \| good	21.571 \| good	0.997 \| good	6.14 \| good	0.182 \| good
2026-01-25T00:00:00.000Z	18 \| good	2.212 \| good	9.001 \| good	19.082 \| good	0.964 \| good	6.856 \| good	0.185 \| good
2026-01-25T01:00:00.000Z	16 \| good	2.46 \| good	10.001 \| good	16.869 \| good	0.924 \| good	6.791 \| good	0.185 \| good
2026-01-25T02:00:00.000Z	22 \| good	4.212 \| good	18.853 \| good	13.177 \| good	0.883 \| good	6.726 \| good	0.185 \| good
2026-01-25T03:00:00.000Z	33 \| good	6.411 \| good	28.886 \| good	17.578 \| good	0.843 \| good	6.661 \| good	0.185 \| good
2026-01-25T04:00:00.000Z	33 \| good	5.883 \| good	25.376 \| good	16.802 \| good	0.787 \| good	6.223 \| good	0.184 \| good
2026-01-25T05:00:00.000Z	33 \| good	5.939 \| good	26.671 \| good	14.012 \| good	0.73 \| good	5.785 \| good	0.183 \| good
2026-01-25T06:00:00.000Z	33 \| good	5.963 \| good	27 \| good	13.127 \| good	0.674 \| good	5.348 \| good	0.182 \| good
2026-01-25T07:00:00.000Z	38 \| good	6.675 \| good	30 \| good	12.938 \| good	0.626 \| good	4.889 \| good	0.18 \| good
2026-01-25T08:00:00.000Z	38 \| good	7.094 \| good	31.272 \| good	11.936 \| good	0.578 \| good	4.43 \| good	0.179 \| good
2026-01-25T09:00:00.000Z	38 \| good	7.007 \| good	31.007 \| good	12.997 \| good	0.53 \| good	3.972 \| good	0.178 \| good
2026-01-25T10:00:00.000Z	38 \| good	6.527 \| good	29.153 \| good	14.071 \| good	0.531 \| good	3.845 \| good	0.178 \| good
2026-01-25T11:00:00.000Z	33 \| good	6.389 \| good	28.225 \| good	18.667 \| good	0.531 \| good	3.718 \| good	0.178 \| good
2026-01-25T12:00:00.000Z	33 \| good	5.797 \| good	25.373 \| good	19.948 \| good	0.532 \| good	3.591 \| good	0.178 \| good
2026-01-25T13:00:00.000Z	44 \| good	8.47 \| good	37.219 \| good	20.328 \| good	0.589 \| good	3.873 \| good	0.185 \| good
2026-01-25T14:00:00.000Z	44 \| good	7.955 \| good	35.029 \| good	18.154 \| good	0.647 \| good	4.155 \| good	0.192 \| good
2026-01-25T15:00:00.000Z	44 \| good	7.68 \| good	33.923 \| good	17.028 \| good	0.705 \| good	4.438 \| good	0.199 \| good

St. Charles

Empower business decisions with accurate air quality data

Real-time air quality map: Monitor AQI near St. Charles, Missouri

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How accurate is Missouri, USA air quality data?

The air quality data for Missouri, 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 St. Charles, Missouri get updated?

Air quality updates for St. Charles, Missouri are available every hour.

What time in the past 24 hours saw the poorest air quality in St. Charles, Missouri?

St. Charles, Missouri experienced its worst air quality at 06:00:00, 2026-01-23.

When was air quality in St. Charles, Missouri the best over the past 24 hours?

The best air quality in St. Charles, Missouri was observed at 10:00:00 on 2026-01-23.

What is the air quality in St. Charles, Missouri right now?

The air quality in St. Charles, Missouri right now is Good, with an AQI of 29.

What pollutant is most frequently found in St. Charles, Missouri?

In St. Charles, Missouri, O3 is the most frequently found pollutant.

What can I do if the air quality in St. Charles, Missouri is poor?

When air quality in St. Charles, Missouri is compromised, staying indoors and wearing a mask can reduce health risks.

What is the PM_2.5 concentration in St. Charles, Missouri right now?

St. Charles, Missouri currently has a PM_2.5 concentration of 2.406 μg/m³.

What is the current level of PM₁₀ in St. Charles, Missouri?

St. Charles, Missouri currently has a PM₁₀ concentration of 13.311 μg/m³.

What is the current level of carbon monoxide (CO) in St. Charles, Missouri?

The current carbon monoxide (CO) level in St. Charles, Missouri is 0.155 ppm.

What is the current level of sulfur dioxide (SO₂) in St. Charles, Missouri?

The current sulfur dioxide (SO₂) concentration in St. Charles, Missouri is 0.378 ppb.

What is the current level of ozone (O₃) in St. Charles, Missouri?

St. Charles, Missouri currently has an ozone (O₃) concentration of 30.725 ppm.

What is the current level of nitrogen dioxide (NO₂) in St. Charles, Missouri?

The current level of nitrogen dioxide (NO₂) in St. Charles, Missouri is 4.12 ppb.

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