What is the current level of PM10 in Chelmsford, Massachusetts?

Chelmsford, Massachusetts currently has a PM10 concentration of 13.6 μg/m3.

What is the current level of sulfur dioxide (SO2) in Chelmsford, Massachusetts?

The current sulfur dioxide (SO2) concentration in Chelmsford, Massachusetts is 0.478 ppb.

What is the current level of ozone (O3) in Chelmsford, Massachusetts?

Chelmsford, Massachusetts currently has an ozone (O3) concentration of 45.828 ppm.

What is the current level of nitrogen dioxide (NO2) in Chelmsford, Massachusetts?

The current level of nitrogen dioxide (NO2) in Chelmsford, Massachusetts is 5.34 ppb.

Current air quality index in Chelmsford, Massachusetts today

Q: What is the PM2.5 concentration in Chelmsford, Massachusetts right now?

Chelmsford, Massachusetts currently has a PM2.5 concentration of 4.037 μg/m3.

Stay updated with real-time air quality in Chelmsford, Massachusetts 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

Chelmsford, Massachusetts

Last updated: ... (Local time)

Common air pollutants in Chelmsford, Massachusetts

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

4.04 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

13.60 μg/m³

155

255

425

605+

Ozone (O₃)

45.83 ppb

201

201+

Sulfur Dioxide (SO₂)

0.48 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

5.34 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.19 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Looks like we don't have this data available right now

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Chelmsford, Massachusetts

Scroll To Air Quality Map

Track live Chelmsford, Massachusetts air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-03-28T00:00:00.000Z	40 \| good	2.909 \| good	12.113 \| good	43.182 \| good	0.355 \| good	5.178 \| good	0.194 \| good
2026-03-28T01:00:00.000Z	38 \| good	3.148 \| good	11.611 \| good	41.016 \| good	0.328 \| good	5.39 \| good	0.18 \| good
2026-03-28T02:00:00.000Z	38 \| good	3.365 \| good	10.979 \| good	40.755 \| good	0.408 \| good	4.447 \| good	0.18 \| good
2026-03-28T03:00:00.000Z	36 \| good	3.637 \| good	12.45 \| good	38.86 \| good	0.42 \| good	5.411 \| good	0.214 \| good
2026-03-28T04:00:00.000Z	35 \| good	3.811 \| good	16.472 \| good	38.295 \| good	0.42 \| good	3.85 \| good	0.255 \| good
2026-03-28T05:00:00.000Z	33 \| good	4.035 \| good	17.076 \| good	36.256 \| good	0.356 \| good	4.903 \| good	0.214 \| good
2026-03-28T06:00:00.000Z	36 \| good	4.035 \| good	17.255 \| good	38.868 \| good	0.356 \| good	5.034 \| good	0.214 \| good
2026-03-28T07:00:00.000Z	34 \| good	4.158 \| good	17.548 \| good	37.083 \| good	0.465 \| good	4.993 \| good	0.18 \| good
2026-03-28T08:00:00.000Z	33 \| good	3.808 \| good	15.454 \| good	36.124 \| good	0.37 \| good	3.683 \| good	0.18 \| good
2026-03-28T09:00:00.000Z	33 \| good	3.831 \| good	15.692 \| good	35.862 \| good	0.338 \| good	2.418 \| good	0.149 \| good
2026-03-28T10:00:00.000Z	34 \| good	3.878 \| good	16.904 \| good	36.846 \| good	0.359 \| good	2.543 \| good	0.18 \| good
2026-03-28T11:00:00.000Z	35 \| good	3.885 \| good	15.914 \| good	38.004 \| good	0.384 \| good	3.356 \| good	0.18 \| good
2026-03-28T12:00:00.000Z	34 \| good	4.03 \| good	17.465 \| good	36.709 \| good	0.348 \| good	3.59 \| good	0.194 \| good
2026-03-28T13:00:00.000Z	36 \| good	4.111 \| good	17.113 \| good	38.935 \| good	0.35 \| good	3.449 \| good	0.194 \| good
2026-03-28T14:00:00.000Z	36 \| good	4.137 \| good	17.675 \| good	38.646 \| good	0.385 \| good	2.526 \| good	0.18 \| good
2026-03-28T15:00:00.000Z	36 \| good	4.209 \| good	16.689 \| good	38.846 \| good	0.402 \| good	2.135 \| good	0.18 \| good
2026-03-28T16:00:00.000Z	36 \| good	4.326 \| good	17.411 \| good	39.459 \| good	0.37 \| good	2.036 \| good	0.18 \| good
2026-03-28T17:00:00.000Z	39 \| good	4.251 \| good	17.62 \| good	42.16 \| good	0.386 \| good	1.25 \| good	0.18 \| good
2026-03-28T18:00:00.000Z	39 \| good	4.191 \| good	14.977 \| good	41.923 \| good	0.407 \| good	1.188 \| good	0.18 \| good
2026-03-28T19:00:00.000Z	38 \| good	4.171 \| good	17.653 \| good	41.415 \| good	0.386 \| good	1.091 \| good	0.18 \| good
2026-03-28T20:00:00.000Z	38 \| good	4.587 \| good	18.833 \| good	41.126 \| good	0.561 \| good	0.936 \| good	0.18 \| good
2026-03-28T21:00:00.000Z	40 \| good	4.133 \| good	16.702 \| good	42.628 \| good	0.561 \| good	1.804 \| good	0.18 \| good
2026-03-28T22:00:00.000Z	39 \| good	4.194 \| good	16.814 \| good	42.076 \| good	0.522 \| good	2.209 \| good	0.18 \| good
2026-03-28T23:00:00.000Z	37 \| good	3.822 \| good	16.165 \| good	40.051 \| good	0.5 \| good	2.802 \| good	0.2 \| good
2026-03-29T00:00:00.000Z	38 \| good	3.715 \| good	16.033 \| good	41.045 \| good	0.517 \| good	2.775 \| good	0.2 \| good
2026-03-29T01:00:00.000Z	38 \| good	3.698 \| good	12.407 \| good	40.563 \| good	0.525 \| good	3.614 \| good	0.22 \| good
2026-03-29T02:00:00.000Z	37 \| good	3.677 \| good	16.094 \| good	39.821 \| good	0.536 \| good	5.711 \| good	0.2 \| good
2026-03-29T03:00:00.000Z	29 \| good	3.64 \| good	16 \| good	31.412 \| good	0.593 \| good	6.141 \| good	0.222 \| good
2026-03-29T04:00:00.000Z	37 \| good	3.804 \| good	16.022 \| good	39.501 \| good	0.54 \| good	3.519 \| good	0.2 \| good
2026-03-29T05:00:00.000Z	38 \| good	3.67 \| good	15.607 \| good	41.319 \| good	0.515 \| good	3.178 \| good	0.2 \| good
2026-03-29T06:00:00.000Z	37 \| good	3.617 \| good	9.849 \| good	39.632 \| good	0.515 \| good	3.013 \| good	0.2 \| good
2026-03-29T07:00:00.000Z	33 \| good	3.428 \| good	15.592 \| good	36.428 \| good	0.514 \| good	4.031 \| good	0.18 \| good
2026-03-29T08:00:00.000Z	35 \| good	3.579 \| good	15.119 \| good	37.886 \| good	0.497 \| good	10.006 \| good	0.2 \| good
2026-03-29T09:00:00.000Z	35 \| good	3.437 \| good	12.021 \| good	37.955 \| good	0.495 \| good	9.726 \| good	0.2 \| good
2026-03-29T10:00:00.000Z	34 \| good	3.461 \| good	14.495 \| good	36.973 \| good	0.535 \| good	15.02 \| good	0.167 \| good
2026-03-29T11:00:00.000Z	31 \| good	3.488 \| good	14.73 \| good	33.655 \| good	0.55 \| good	14.62 \| good	0.167 \| good
2026-03-29T12:00:00.000Z	32 \| good	3.617 \| good	14.339 \| good	35.324 \| good	0.42 \| good	12.962 \| good	0.186 \| good
2026-03-29T13:00:00.000Z	33 \| good	3.653 \| good	14.993 \| good	35.548 \| good	0.452 \| good	10.436 \| good	0.226 \| good
2026-03-29T14:00:00.000Z	34 \| good	3.954 \| good	16.571 \| good	36.838 \| good	0.521 \| good	3.94 \| good	0.18 \| good
2026-03-29T15:00:00.000Z	34 \| good	4.098 \| good	16.535 \| good	37.324 \| good	0.547 \| good	3.796 \| good	0.18 \| good
2026-03-29T16:00:00.000Z	37 \| good	4.347 \| good	15.583 \| good	39.636 \| good	0.568 \| good	5.21 \| good	0.18 \| good
2026-03-29T17:00:00.000Z	40 \| good	4.325 \| good	17.035 \| good	42.735 \| good	0.403 \| good	3.863 \| good	0.18 \| good
2026-03-29T18:00:00.000Z	40 \| good	3.685 \| good	13.356 \| good	42.95 \| good	0.389 \| good	4.771 \| good	0.167 \| good
2026-03-29T19:00:00.000Z	43 \| good	4.06 \| good	17.078 \| good	45.719 \| good	0.391 \| good	5.329 \| good	0.167 \| good
2026-03-29T20:00:00.000Z	43 \| good	4.049 \| good	15.282 \| good	45.857 \| good	0.577 \| good	5.378 \| good	0.167 \| good
2026-03-29T21:00:00.000Z	43 \| good	4.03 \| good	16.925 \| good	45.501 \| good	0.515 \| good	6.39 \| good	0.18 \| good
2026-03-29T22:00:00.000Z	43 \| good	4.037 \| good	13.6 \| good	45.828 \| good	0.478 \| good	5.34 \| good	0.187 \| good
2026-03-29T23:00:00.000Z	44 \| good	4.396 \| good	16.734 \| good	46.728 \| good	0.386 \| good	9.977 \| good	0.187 \| good
2026-03-29T23:00:00.000Z	43 \| good	4.037 \| good	13.6 \| good	45.828 \| good	0.478 \| good	5.34 \| good	0.187 \| good
2026-03-30T00:00:00.000Z	34 \| good	5.366 \| good	23.03 \| good	36.786 \| good	1.502 \| good	8.987 \| good	0.199 \| good
2026-03-30T01:00:00.000Z	37 \| good	5.288 \| good	23 \| good	40.106 \| good	1.612 \| good	8.393 \| good	0.2 \| good
2026-03-30T02:00:00.000Z	35 \| good	5.872 \| good	25.401 \| good	38.393 \| good	1.721 \| good	7.799 \| good	0.202 \| good
2026-03-30T03:00:00.000Z	38 \| good	7.095 \| good	31.339 \| good	35.514 \| good	1.831 \| good	7.204 \| good	0.203 \| good
2026-03-30T04:00:00.000Z	38 \| good	7.477 \| good	32.695 \| good	35.612 \| good	1.713 \| good	6.287 \| good	0.197 \| good
2026-03-30T05:00:00.000Z	33 \| good	6.392 \| good	28.213 \| good	35.108 \| good	1.595 \| good	5.37 \| good	0.191 \| good
2026-03-30T06:00:00.000Z	38 \| good	6.838 \| good	30.237 \| good	33.002 \| good	1.477 \| good	4.452 \| good	0.186 \| good
2026-03-30T07:00:00.000Z	38 \| good	7.475 \| good	32.595 \| good	35.708 \| good	1.334 \| good	3.958 \| good	0.176 \| good
2026-03-30T08:00:00.000Z	33 \| good	6.358 \| good	28.526 \| good	34.652 \| good	1.191 \| good	3.464 \| good	0.166 \| good
2026-03-30T09:00:00.000Z	32 \| good	4.291 \| good	18.94 \| good	35.431 \| good	1.048 \| good	2.969 \| good	0.157 \| good
2026-03-30T10:00:00.000Z	28 \| good	1.357 \| good	5.166 \| good	30.4 \| good	1.087 \| good	3.712 \| good	0.164 \| good
2026-03-30T11:00:00.000Z	30 \| good	1.701 \| good	6.819 \| good	31.547 \| good	1.125 \| good	4.454 \| good	0.171 \| good
2026-03-30T12:00:00.000Z	30 \| good	1.878 \| good	8.145 \| good	32.158 \| good	1.164 \| good	5.196 \| good	0.178 \| good
2026-03-30T13:00:00.000Z	31 \| good	4.688 \| good	20.146 \| good	33.344 \| good	1.323 \| good	5 \| good	0.185 \| good
2026-03-30T14:00:00.000Z	38 \| good	6.566 \| good	29.256 \| good	36.696 \| good	1.482 \| good	4.803 \| good	0.192 \| good
2026-03-30T15:00:00.000Z	33 \| good	6.346 \| good	28.065 \| good	36.151 \| good	1.641 \| good	4.606 \| good	0.199 \| good
2026-03-30T16:00:00.000Z	38 \| good	7.422 \| good	32.466 \| good	37.958 \| good	1.758 \| good	4.297 \| good	0.194 \| good
2026-03-30T17:00:00.000Z	49 \| good	8.668 \| good	37.782 \| good	41.317 \| good	1.875 \| good	3.988 \| good	0.19 \| good
2026-03-30T18:00:00.000Z	54 \| moderate	11.153 \| good	49.272 \| good	44.304 \| good	1.992 \| good	3.679 \| good	0.185 \| good
2026-03-30T19:00:00.000Z	52 \| moderate	10.352 \| good	46.002 \| good	45.986 \| good	1.917 \| good	3.854 \| good	0.181 \| good
2026-03-30T20:00:00.000Z	54 \| moderate	10.598 \| good	47.019 \| good	45.953 \| good	1.842 \| good	4.028 \| good	0.177 \| good
2026-03-30T21:00:00.000Z	44 \| good	8.452 \| good	37.342 \| good	46.449 \| good	1.767 \| good	4.203 \| good	0.173 \| good
2026-03-30T22:00:00.000Z	39 \| good	6.779 \| good	30.179 \| good	42.19 \| good	1.808 \| good	5.477 \| good	0.182 \| good
2026-03-30T23:00:00.000Z	33 \| good	6.435 \| good	29.021 \| good	35.65 \| good	1.848 \| good	6.75 \| good	0.19 \| good
2026-03-31T00:00:00.000Z	38 \| good	6.791 \| good	30.077 \| good	33.369 \| good	1.889 \| good	8.024 \| good	0.198 \| good
2026-03-31T01:00:00.000Z	38 \| good	6.785 \| good	29.968 \| good	32.905 \| good	2.003 \| good	8.005 \| good	0.2 \| good
2026-03-31T02:00:00.000Z	49 \| good	9.439 \| good	42.08 \| good	34.995 \| good	2.117 \| good	7.987 \| good	0.202 \| good
2026-03-31T03:00:00.000Z	54 \| moderate	11.486 \| good	50.693 \| good	34.132 \| good	2.231 \| good	7.968 \| good	0.204 \| good
2026-03-31T04:00:00.000Z	54 \| moderate	10.92 \| good	48.477 \| good	32.827 \| good	2.302 \| good	7.485 \| good	0.204 \| good
2026-03-31T05:00:00.000Z	54 \| moderate	10.781 \| good	48.05 \| good	30.982 \| good	2.374 \| good	7.001 \| good	0.204 \| good
2026-03-31T06:00:00.000Z	60 \| moderate	14.274 \| fine	14.873 \| good	37.381 \| good	2.432 \| good	6.516 \| good	0.204 \| good
2026-03-31T07:00:00.000Z	54 \| moderate	11.371 \| good	50.545 \| good	24.616 \| good	2.395 \| good	6.275 \| good	0.202 \| good
2026-03-31T08:00:00.000Z	54 \| moderate	11.095 \| good	49.009 \| good	24.398 \| good	2.346 \| good	6.033 \| good	0.2 \| good
2026-03-31T09:00:00.000Z	49 \| good	9.045 \| good	39.99 \| good	25.619 \| good	2.296 \| good	5.791 \| good	0.198 \| good
2026-03-31T10:00:00.000Z	54 \| moderate	10.643 \| good	47.142 \| good	22.356 \| good	2.211 \| good	7.361 \| good	0.206 \| good
2026-03-31T11:00:00.000Z	49 \| good	8.529 \| good	37.317 \| good	24.308 \| good	2.126 \| good	8.931 \| good	0.214 \| good
2026-03-31T12:00:00.000Z	64 \| moderate	16.445 \| fine	16.735 \| good	30.252 \| good	2.031 \| good	10.514 \| good	0.222 \| good
2026-03-31T13:00:00.000Z	64 \| moderate	16.278 \| fine	16.537 \| good	31.877 \| good	1.926 \| good	9.357 \| good	0.215 \| good
2026-03-31T14:00:00.000Z	62 \| moderate	14.666 \| fine	14.925 \| good	33.502 \| good	1.821 \| good	8.2 \| good	0.208 \| good
2026-03-31T15:00:00.000Z	56 \| moderate	11.938 \| good	12.288 \| good	35.126 \| good	1.716 \| good	7.043 \| good	0.201 \| good
2026-03-31T16:00:00.000Z	54 \| moderate	11.218 \| good	11.687 \| good	36.55 \| good	1.542 \| good	6.342 \| good	0.198 \| good
2026-03-31T17:00:00.000Z	54 \| moderate	10.709 \| good	47.531 \| good	19.391 \| good	1.372 \| good	5.631 \| good	0.195 \| good
2026-03-31T18:00:00.000Z	52 \| moderate	10.222 \| good	10.818 \| good	39.398 \| good	1.195 \| good	4.941 \| good	0.192 \| good
2026-03-31T19:00:00.000Z	49 \| good	9.247 \| good	9.833 \| good	38.435 \| good	1.131 \| good	5.468 \| good	0.198 \| good
2026-03-31T20:00:00.000Z	49 \| good	8.501 \| good	9.102 \| good	37.472 \| good	1.068 \| good	5.994 \| good	0.203 \| good
2026-03-31T21:00:00.000Z	49 \| good	8.509 \| good	9.229 \| good	36.51 \| good	1.004 \| good	6.521 \| good	0.208 \| good
2026-03-31T22:00:00.000Z	44 \| good	8.177 \| good	9.201 \| good	34.72 \| good	0.957 \| good	7.378 \| good	0.214 \| good
2026-03-31T23:00:00.000Z	49 \| good	8.521 \| good	9.727 \| good	32.931 \| good	0.911 \| good	8.235 \| good	0.22 \| good

Chelmsford

Empower business decisions with accurate air quality data

Real-time air quality map: Monitor AQI near Chelmsford, Massachusetts

0.19ppm

How accurate is Massachusetts, USA air quality data?

The air quality data for Massachusetts, 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 Chelmsford, Massachusetts get updated?

Air quality updates for Chelmsford, Massachusetts are available every hour.

What time in the past 24 hours saw the poorest air quality in Chelmsford, Massachusetts?

Chelmsford, Massachusetts experienced its worst air quality at 10:00:00, 2026-03-29.

When was air quality in Chelmsford, Massachusetts the best over the past 24 hours?

The best air quality in Chelmsford, Massachusetts was observed at 03:00:00 on 2026-03-29.

What is the air quality in Chelmsford, Massachusetts right now?

The air quality in Chelmsford, Massachusetts right now is Good, with an AQI of 43.

What pollutant is most frequently found in Chelmsford, Massachusetts?

In Chelmsford, Massachusetts, O3 is the most frequently found pollutant.

What can I do if the air quality in Chelmsford, Massachusetts is poor?

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

What is the PM_2.5 concentration in Chelmsford, Massachusetts right now?

Chelmsford, Massachusetts currently has a PM_2.5 concentration of 4.037 μg/m³.

What is the current level of PM₁₀ in Chelmsford, Massachusetts?

Chelmsford, Massachusetts currently has a PM₁₀ concentration of 13.6 μg/m³.

What is the current level of carbon monoxide (CO) in Chelmsford, Massachusetts?

The current carbon monoxide (CO) level in Chelmsford, Massachusetts is 0.187 ppm.

What is the current level of sulfur dioxide (SO₂) in Chelmsford, Massachusetts?

The current sulfur dioxide (SO₂) concentration in Chelmsford, Massachusetts is 0.478 ppb.

What is the current level of ozone (O₃) in Chelmsford, Massachusetts?

Chelmsford, Massachusetts currently has an ozone (O₃) concentration of 45.828 ppm.

What is the current level of nitrogen dioxide (NO₂) in Chelmsford, Massachusetts?

The current level of nitrogen dioxide (NO₂) in Chelmsford, Massachusetts is 5.34 ppb.

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