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

Chelmsford, Massachusetts currently has a PM10 concentration of 38.818 μg/m3.

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

The current sulfur dioxide (SO2) concentration in Chelmsford, Massachusetts is 0.58 ppb.

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

Chelmsford, Massachusetts currently has an ozone (O3) concentration of 30.549 ppm.

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

The current level of nitrogen dioxide (NO2) in Chelmsford, Massachusetts is 19.306 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 8.006 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)

8.01 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

38.82 μg/m³

155

255

425

605+

Ozone (O₃)

30.55 ppb

201

201+

Sulfur Dioxide (SO₂)

0.58 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

19.31 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.29 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Chelmsford, Massachusetts

Get Live Pollen Counts

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
2025-12-27T00:00:00.000Z	30 \| good	5.084 \| good	22.191 \| good	31.508 \| good	0.494 \| good	17.954 \| good	0.278 \| good
2025-12-27T01:00:00.000Z	38 \| good	6.661 \| good	30.3 \| good	25.028 \| good	0.498 \| good	18.898 \| good	0.328 \| good
2025-12-27T02:00:00.000Z	38 \| good	6.661 \| good	30.13 \| good	22.577 \| good	0.514 \| good	16.758 \| good	0.314 \| good
2025-12-27T03:00:00.000Z	38 \| good	6.652 \| good	29.565 \| good	20.037 \| good	0.455 \| good	16.606 \| good	0.314 \| good
2025-12-27T04:00:00.000Z	33 \| good	6.016 \| good	28.714 \| good	21.775 \| good	0.502 \| good	13.071 \| good	0.314 \| good
2025-12-27T05:00:00.000Z	27 \| good	5.403 \| good	19.265 \| good	23.104 \| good	0.505 \| good	8.319 \| good	0.229 \| good
2025-12-27T06:00:00.000Z	33 \| good	5.666 \| good	19.237 \| good	25.698 \| good	0.51 \| good	6.754 \| good	0.219 \| good
2025-12-27T07:00:00.000Z	33 \| good	5.566 \| good	21.722 \| good	25.436 \| good	0.511 \| good	7.281 \| good	0.219 \| good
2025-12-27T08:00:00.000Z	27 \| good	4.972 \| good	20.655 \| good	28.224 \| good	0.482 \| good	4.933 \| good	0.219 \| good
2025-12-27T09:00:00.000Z	28 \| good	4.224 \| good	17.152 \| good	29.79 \| good	0.502 \| good	4.99 \| good	0.2 \| good
2025-12-27T10:00:00.000Z	27 \| good	3.752 \| good	14.953 \| good	29.38 \| good	0.463 \| good	3.911 \| good	0.214 \| good
2025-12-27T11:00:00.000Z	27 \| good	3.199 \| good	11.415 \| good	29.496 \| good	0.464 \| good	3.886 \| good	0.2 \| good
2025-12-27T12:00:00.000Z	28 \| good	3.286 \| good	13.189 \| good	30.468 \| good	0.463 \| good	3.906 \| good	0.2 \| good
2025-12-27T13:00:00.000Z	30 \| good	2.999 \| good	12.096 \| good	32.16 \| good	0.463 \| good	3.25 \| good	0.2 \| good
2025-12-27T14:00:00.000Z	30 \| good	2.687 \| good	10.576 \| good	31.853 \| good	0.448 \| good	3.823 \| good	0.248 \| good
2025-12-27T15:00:00.000Z	31 \| good	3.172 \| good	16.483 \| good	33.212 \| good	0.462 \| good	3.787 \| good	0.248 \| good
2025-12-27T16:00:00.000Z	30 \| good	2.602 \| good	10.061 \| good	32.323 \| good	0.462 \| good	2.892 \| good	0.221 \| good
2025-12-27T17:00:00.000Z	30 \| good	2.773 \| good	16.873 \| good	32.398 \| good	0.463 \| good	2.578 \| good	0.235 \| good
2025-12-27T18:00:00.000Z	31 \| good	2.9 \| good	9.357 \| good	34.233 \| good	0.5 \| good	2.909 \| good	0.221 \| good
2025-12-27T19:00:00.000Z	31 \| good	3.14 \| good	16.626 \| good	33.355 \| good	0.499 \| good	4.033 \| good	0.221 \| good
2025-12-27T20:00:00.000Z	31 \| good	3.178 \| good	14.4 \| good	33.229 \| good	0.484 \| good	4.104 \| good	0.222 \| good
2025-12-27T21:00:00.000Z	31 \| good	3.366 \| good	13.615 \| good	32.5 \| good	0.425 \| good	5.5 \| good	0.256 \| good
2025-12-27T22:00:00.000Z	31 \| good	3.523 \| good	14.641 \| good	32.869 \| good	0.384 \| good	9.569 \| good	0.29 \| good
2025-12-27T23:00:00.000Z	29 \| good	4.583 \| good	16.653 \| good	30.523 \| good	0.402 \| good	22.86 \| good	0.306 \| good
2025-12-28T00:00:00.000Z	33 \| good	5.763 \| good	20.042 \| good	22.149 \| good	0.485 \| good	27.078 \| good	0.361 \| good
2025-12-28T01:00:00.000Z	44 \| good	7.779 \| good	31.944 \| good	18.399 \| good	0.404 \| good	26.391 \| good	0.444 \| good
2025-12-28T02:00:00.000Z	44 \| good	8.198 \| good	36.261 \| good	16.467 \| good	0.488 \| good	20.543 \| good	0.482 \| good
2025-12-28T03:00:00.000Z	49 \| good	9.029 \| good	40.227 \| good	19.689 \| good	0.52 \| good	10.826 \| good	0.211 \| good
2025-12-28T04:00:00.000Z	54 \| moderate	10.968 \| good	39.656 \| good	8.768 \| good	0.448 \| good	17.954 \| good	0.38 \| good
2025-12-28T05:00:00.000Z	52 \| moderate	10.338 \| good	45.22 \| good	9.053 \| good	0.44 \| good	20.48 \| good	0.37 \| good
2025-12-28T06:00:00.000Z	58 \| moderate	12.572 \| fine	55.746 \| fine	10.357 \| good	0.449 \| good	20.19 \| good	0.366 \| good
2025-12-28T07:00:00.000Z	56 \| moderate	12.024 \| good	47.911 \| good	8.258 \| good	0.448 \| good	20.547 \| good	0.346 \| good
2025-12-28T08:00:00.000Z	54 \| moderate	11.143 \| good	40.061 \| good	7.472 \| good	0.461 \| good	19.391 \| good	0.29 \| good
2025-12-28T09:00:00.000Z	52 \| moderate	10.461 \| good	34.623 \| good	4.532 \| good	0.519 \| good	20.122 \| good	0.347 \| good
2025-12-28T10:00:00.000Z	54 \| moderate	10.592 \| good	40.566 \| good	5.075 \| good	0.577 \| good	23.258 \| good	0.359 \| good
2025-12-28T11:00:00.000Z	54 \| moderate	11.159 \| good	38.452 \| good	5.857 \| good	0.53 \| good	24.7 \| good	0.36 \| good
2025-12-28T12:00:00.000Z	49 \| good	9.478 \| good	44.538 \| good	6.175 \| good	0.561 \| good	24.806 \| good	0.356 \| good
2025-12-28T13:00:00.000Z	52 \| moderate	9.501 \| good	36.218 \| good	8.34 \| good	0.563 \| good	24.9 \| good	0.455 \| good
2025-12-28T14:00:00.000Z	54 \| moderate	10.505 \| good	48.144 \| good	10.419 \| good	0.543 \| good	25.884 \| good	0.357 \| good
2025-12-28T15:00:00.000Z	49 \| good	8.539 \| good	37.553 \| good	10.66 \| good	0.503 \| good	16.786 \| good	0.279 \| good
2025-12-28T16:00:00.000Z	44 \| good	8.149 \| good	36.273 \| good	15.072 \| good	0.527 \| good	12.696 \| good	0.255 \| good
2025-12-28T17:00:00.000Z	38 \| good	6.914 \| good	30.672 \| good	22.358 \| good	0.506 \| good	7.674 \| good	0.234 \| good
2025-12-28T18:00:00.000Z	38 \| good	5.475 \| good	41.466 \| good	25.233 \| good	0.51 \| good	6.158 \| good	0.233 \| good
2025-12-28T19:00:00.000Z	38 \| good	6.541 \| good	38.417 \| good	29.821 \| good	0.503 \| good	8.722 \| good	0.233 \| good
2025-12-28T20:00:00.000Z	33 \| good	5.883 \| good	27.979 \| good	31.477 \| good	0.518 \| good	13.838 \| good	0.289 \| good
2025-12-28T21:00:00.000Z	38 \| good	7.439 \| good	30.888 \| good	33.154 \| good	0.545 \| good	21.727 \| good	0.274 \| good
2025-12-28T22:00:00.000Z	44 \| good	7.612 \| good	36.654 \| good	31.239 \| good	0.561 \| good	18.489 \| good	0.288 \| good
2025-12-28T23:00:00.000Z	44 \| good	8.006 \| good	38.818 \| good	30.549 \| good	0.58 \| good	19.306 \| good	0.294 \| good
2025-12-29T00:00:00.000Z	60 \| moderate	14.003 \| fine	62.791 \| fine	15.243 \| good	1.15 \| good	20.138 \| good	0.296 \| good
2025-12-29T01:00:00.000Z	60 \| moderate	13.553 \| fine	60.777 \| fine	18.021 \| good	1.386 \| good	19.795 \| good	0.286 \| good
2025-12-29T02:00:00.000Z	62 \| moderate	14.523 \| fine	65.103 \| fine	18.008 \| good	1.623 \| good	19.453 \| good	0.277 \| good
2025-12-29T03:00:00.000Z	62 \| moderate	15.146 \| fine	68.132 \| fine	17.044 \| good	1.859 \| good	19.111 \| good	0.267 \| good
2025-12-29T04:00:00.000Z	66 \| moderate	16.871 \| fine	74.987 \| fine	12.481 \| good	1.73 \| good	18.875 \| good	0.256 \| good
2025-12-29T05:00:00.000Z	69 \| moderate	18.577 \| fine	82.072 \| fine	7.228 \| good	1.6 \| good	18.64 \| good	0.246 \| good
2025-12-29T06:00:00.000Z	66 \| moderate	17.022 \| fine	75.112 \| fine	9.948 \| good	1.471 \| good	18.404 \| good	0.235 \| good
2025-12-29T07:00:00.000Z	58 \| moderate	12.585 \| fine	56.808 \| fine	16.913 \| good	1.143 \| good	14.16 \| good	0.21 \| good
2025-12-29T08:00:00.000Z	54 \| moderate	10.633 \| good	47.209 \| good	18.503 \| good	0.814 \| good	9.915 \| good	0.184 \| good
2025-12-29T09:00:00.000Z	54 \| moderate	11.154 \| good	49.513 \| good	14.404 \| good	0.486 \| good	5.67 \| good	0.159 \| good
2025-12-29T10:00:00.000Z	52 \| moderate	9.748 \| good	43.638 \| good	13.541 \| good	0.496 \| good	5.64 \| good	0.16 \| good
2025-12-29T11:00:00.000Z	44 \| good	7.537 \| good	33.235 \| good	13.779 \| good	0.506 \| good	5.61 \| good	0.162 \| good
2025-12-29T12:00:00.000Z	33 \| good	5.762 \| good	25.219 \| good	16.63 \| good	0.516 \| good	5.58 \| good	0.163 \| good
2025-12-29T13:00:00.000Z	22 \| good	4.168 \| good	18.008 \| good	18.367 \| good	0.689 \| good	6.297 \| good	0.172 \| good
2025-12-29T14:00:00.000Z	27 \| good	4.552 \| good	19.783 \| good	21.147 \| good	0.861 \| good	7.013 \| good	0.181 \| good
2025-12-29T15:00:00.000Z	27 \| good	4.589 \| good	19.848 \| good	21.987 \| good	1.034 \| good	7.729 \| good	0.19 \| good
2025-12-29T16:00:00.000Z	22 \| good	4.229 \| good	18.538 \| good	24.291 \| good	1.024 \| good	7.916 \| good	0.192 \| good
2025-12-29T17:00:00.000Z	27 \| good	5.304 \| good	22.694 \| good	23.238 \| good	1.015 \| good	8.103 \| good	0.193 \| good
2025-12-29T18:00:00.000Z	33 \| good	6.176 \| good	27.478 \| good	23.883 \| good	1.005 \| good	8.291 \| good	0.194 \| good
2025-12-29T19:00:00.000Z	44 \| good	7.511 \| good	33.141 \| good	23.021 \| good	1.079 \| good	9.571 \| good	0.201 \| good
2025-12-29T20:00:00.000Z	27 \| good	4.406 \| good	19.12 \| good	28.881 \| good	1.154 \| good	10.852 \| good	0.208 \| good
2025-12-29T21:00:00.000Z	34 \| good	2.722 \| good	10.758 \| good	36.924 \| good	1.228 \| good	12.132 \| good	0.215 \| good
2025-12-29T22:00:00.000Z	31 \| good	5.033 \| good	21.857 \| good	33.64 \| good	1.252 \| good	10.228 \| good	0.204 \| good
2025-12-29T23:00:00.000Z	33 \| good	6.499 \| good	28.62 \| good	32.539 \| good	1.277 \| good	8.324 \| good	0.193 \| good
2025-12-30T00:00:00.000Z	38 \| good	6.582 \| good	29.071 \| good	26.596 \| good	1.301 \| good	6.42 \| good	0.182 \| good
2025-12-30T01:00:00.000Z	27 \| good	5.201 \| good	22.287 \| good	25.286 \| good	1.033 \| good	5.183 \| good	0.179 \| good
2025-12-30T02:00:00.000Z	27 \| good	4.559 \| good	20.012 \| good	23.916 \| good	0.765 \| good	3.947 \| good	0.177 \| good
2025-12-30T03:00:00.000Z	22 \| good	4.35 \| good	18.925 \| good	24.097 \| good	0.498 \| good	2.71 \| good	0.174 \| good
2025-12-30T04:00:00.000Z	22 \| good	3.638 \| good	15.846 \| good	24.271 \| good	0.454 \| good	2.377 \| good	0.166 \| good
2025-12-30T05:00:00.000Z	24 \| good	3.053 \| good	12.956 \| good	26.195 \| good	0.41 \| good	2.043 \| good	0.158 \| good
2025-12-30T06:00:00.000Z	28 \| good	1.906 \| good	7.846 \| good	29.922 \| good	0.366 \| good	1.71 \| good	0.15 \| good
2025-12-30T07:00:00.000Z	29 \| good	1.18 \| good	4.815 \| good	30.858 \| good	0.349 \| good	1.536 \| good	0.146 \| good
2025-12-30T08:00:00.000Z	28 \| good	0.265 \| good	0.844 \| good	30.379 \| good	0.331 \| good	1.362 \| good	0.142 \| good
2025-12-30T09:00:00.000Z	29 \| good	0.331 \| good	1.153 \| good	31.036 \| good	0.314 \| good	1.188 \| good	0.138 \| good
2025-12-30T10:00:00.000Z	29 \| good	0.256 \| good	0.815 \| good	31.228 \| good	0.316 \| good	1.488 \| good	0.14 \| good
2025-12-30T11:00:00.000Z	29 \| good	0.372 \| good	1.116 \| good	30.547 \| good	0.319 \| good	1.788 \| good	0.143 \| good
2025-12-30T12:00:00.000Z	28 \| good	0.421 \| good	1.813 \| good	29.699 \| good	0.321 \| good	2.088 \| good	0.145 \| good
2025-12-30T13:00:00.000Z	28 \| good	0.397 \| good	1.488 \| good	30.097 \| good	0.285 \| good	1.75 \| good	0.142 \| good
2025-12-30T14:00:00.000Z	29 \| good	0.348 \| good	1 \| good	30.68 \| good	0.249 \| good	1.413 \| good	0.139 \| good
2025-12-30T15:00:00.000Z	29 \| good	0.334 \| good	1.364 \| good	30.686 \| good	0.213 \| good	1.076 \| good	0.136 \| good
2025-12-30T16:00:00.000Z	30 \| good	0.544 \| good	2 \| good	32.121 \| good	0.209 \| good	1.032 \| good	0.135 \| good
2025-12-30T17:00:00.000Z	31 \| good	0.605 \| good	2.117 \| good	33.086 \| good	0.206 \| good	0.987 \| good	0.134 \| good
2025-12-30T18:00:00.000Z	31 \| good	0.516 \| good	1.872 \| good	33.532 \| good	0.202 \| good	0.942 \| good	0.133 \| good
2025-12-30T19:00:00.000Z	31 \| good	0.305 \| good	1.116 \| good	34.483 \| good	0.21 \| good	1.196 \| good	0.134 \| good
2025-12-30T20:00:00.000Z	33 \| good	0.258 \| good	0.999 \| good	35.85 \| good	0.218 \| good	1.451 \| good	0.134 \| good
2025-12-30T21:00:00.000Z	33 \| good	0.427 \| good	1.517 \| good	36.306 \| good	0.226 \| good	1.706 \| good	0.135 \| good
2025-12-30T22:00:00.000Z	32 \| good	1.136 \| good	4.449 \| good	35.318 \| good	0.267 \| good	1.911 \| good	0.136 \| good
2025-12-30T23:00:00.000Z	32 \| good	2.256 \| good	9.024 \| good	34.554 \| good	0.308 \| good	2.116 \| good	0.137 \| good

Chelmsford

Empower business decisions with accurate air quality data

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

0.28ppm

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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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 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 06:00:00, 2025-12-28.

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

The best air quality in Chelmsford, Massachusetts was observed at 11:00:00 on 2025-12-27.

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

The air quality in Chelmsford, Massachusetts right now is Good, with an AQI of 44.

What pollutant is most frequently found in Chelmsford, Massachusetts?

In Chelmsford, Massachusetts, PM2.5 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 8.006 μg/m³.

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

Chelmsford, Massachusetts currently has a PM₁₀ concentration of 38.818 μg/m³.

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

The current carbon monoxide (CO) level in Chelmsford, Massachusetts is 0.294 ppm.

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

The current sulfur dioxide (SO₂) concentration in Chelmsford, Massachusetts is 0.58 ppb.

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

Chelmsford, Massachusetts currently has an ozone (O₃) concentration of 30.549 ppm.

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

The current level of nitrogen dioxide (NO₂) in Chelmsford, Massachusetts is 19.306 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-12-27T00:00:00.000Z	30 \| good	5.084 \| good	22.191 \| good	31.508 \| good	0.494 \| good	17.954 \| good	0.278 \| good
2025-12-27T01:00:00.000Z	38 \| good	6.661 \| good	30.3 \| good	25.028 \| good	0.498 \| good	18.898 \| good	0.328 \| good
2025-12-27T02:00:00.000Z	38 \| good	6.661 \| good	30.13 \| good	22.577 \| good	0.514 \| good	16.758 \| good	0.314 \| good
2025-12-27T03:00:00.000Z	38 \| good	6.652 \| good	29.565 \| good	20.037 \| good	0.455 \| good	16.606 \| good	0.314 \| good
2025-12-27T04:00:00.000Z	33 \| good	6.016 \| good	28.714 \| good	21.775 \| good	0.502 \| good	13.071 \| good	0.314 \| good
2025-12-27T05:00:00.000Z	27 \| good	5.403 \| good	19.265 \| good	23.104 \| good	0.505 \| good	8.319 \| good	0.229 \| good
2025-12-27T06:00:00.000Z	33 \| good	5.666 \| good	19.237 \| good	25.698 \| good	0.51 \| good	6.754 \| good	0.219 \| good
2025-12-27T07:00:00.000Z	33 \| good	5.566 \| good	21.722 \| good	25.436 \| good	0.511 \| good	7.281 \| good	0.219 \| good
2025-12-27T08:00:00.000Z	27 \| good	4.972 \| good	20.655 \| good	28.224 \| good	0.482 \| good	4.933 \| good	0.219 \| good
2025-12-27T09:00:00.000Z	28 \| good	4.224 \| good	17.152 \| good	29.79 \| good	0.502 \| good	4.99 \| good	0.2 \| good
2025-12-27T10:00:00.000Z	27 \| good	3.752 \| good	14.953 \| good	29.38 \| good	0.463 \| good	3.911 \| good	0.214 \| good
2025-12-27T11:00:00.000Z	27 \| good	3.199 \| good	11.415 \| good	29.496 \| good	0.464 \| good	3.886 \| good	0.2 \| good
2025-12-27T12:00:00.000Z	28 \| good	3.286 \| good	13.189 \| good	30.468 \| good	0.463 \| good	3.906 \| good	0.2 \| good
2025-12-27T13:00:00.000Z	30 \| good	2.999 \| good	12.096 \| good	32.16 \| good	0.463 \| good	3.25 \| good	0.2 \| good
2025-12-27T14:00:00.000Z	30 \| good	2.687 \| good	10.576 \| good	31.853 \| good	0.448 \| good	3.823 \| good	0.248 \| good
2025-12-27T15:00:00.000Z	31 \| good	3.172 \| good	16.483 \| good	33.212 \| good	0.462 \| good	3.787 \| good	0.248 \| good
2025-12-27T16:00:00.000Z	30 \| good	2.602 \| good	10.061 \| good	32.323 \| good	0.462 \| good	2.892 \| good	0.221 \| good
2025-12-27T17:00:00.000Z	30 \| good	2.773 \| good	16.873 \| good	32.398 \| good	0.463 \| good	2.578 \| good	0.235 \| good
2025-12-27T18:00:00.000Z	31 \| good	2.9 \| good	9.357 \| good	34.233 \| good	0.5 \| good	2.909 \| good	0.221 \| good
2025-12-27T19:00:00.000Z	31 \| good	3.14 \| good	16.626 \| good	33.355 \| good	0.499 \| good	4.033 \| good	0.221 \| good
2025-12-27T20:00:00.000Z	31 \| good	3.178 \| good	14.4 \| good	33.229 \| good	0.484 \| good	4.104 \| good	0.222 \| good
2025-12-27T21:00:00.000Z	31 \| good	3.366 \| good	13.615 \| good	32.5 \| good	0.425 \| good	5.5 \| good	0.256 \| good
2025-12-27T22:00:00.000Z	31 \| good	3.523 \| good	14.641 \| good	32.869 \| good	0.384 \| good	9.569 \| good	0.29 \| good
2025-12-27T23:00:00.000Z	29 \| good	4.583 \| good	16.653 \| good	30.523 \| good	0.402 \| good	22.86 \| good	0.306 \| good
2025-12-28T00:00:00.000Z	33 \| good	5.763 \| good	20.042 \| good	22.149 \| good	0.485 \| good	27.078 \| good	0.361 \| good
2025-12-28T01:00:00.000Z	44 \| good	7.779 \| good	31.944 \| good	18.399 \| good	0.404 \| good	26.391 \| good	0.444 \| good
2025-12-28T02:00:00.000Z	44 \| good	8.198 \| good	36.261 \| good	16.467 \| good	0.488 \| good	20.543 \| good	0.482 \| good
2025-12-28T03:00:00.000Z	49 \| good	9.029 \| good	40.227 \| good	19.689 \| good	0.52 \| good	10.826 \| good	0.211 \| good
2025-12-28T04:00:00.000Z	54 \| moderate	10.968 \| good	39.656 \| good	8.768 \| good	0.448 \| good	17.954 \| good	0.38 \| good
2025-12-28T05:00:00.000Z	52 \| moderate	10.338 \| good	45.22 \| good	9.053 \| good	0.44 \| good	20.48 \| good	0.37 \| good
2025-12-28T06:00:00.000Z	58 \| moderate	12.572 \| fine	55.746 \| fine	10.357 \| good	0.449 \| good	20.19 \| good	0.366 \| good
2025-12-28T07:00:00.000Z	56 \| moderate	12.024 \| good	47.911 \| good	8.258 \| good	0.448 \| good	20.547 \| good	0.346 \| good
2025-12-28T08:00:00.000Z	54 \| moderate	11.143 \| good	40.061 \| good	7.472 \| good	0.461 \| good	19.391 \| good	0.29 \| good
2025-12-28T09:00:00.000Z	52 \| moderate	10.461 \| good	34.623 \| good	4.532 \| good	0.519 \| good	20.122 \| good	0.347 \| good
2025-12-28T10:00:00.000Z	54 \| moderate	10.592 \| good	40.566 \| good	5.075 \| good	0.577 \| good	23.258 \| good	0.359 \| good
2025-12-28T11:00:00.000Z	54 \| moderate	11.159 \| good	38.452 \| good	5.857 \| good	0.53 \| good	24.7 \| good	0.36 \| good
2025-12-28T12:00:00.000Z	49 \| good	9.478 \| good	44.538 \| good	6.175 \| good	0.561 \| good	24.806 \| good	0.356 \| good
2025-12-28T13:00:00.000Z	52 \| moderate	9.501 \| good	36.218 \| good	8.34 \| good	0.563 \| good	24.9 \| good	0.455 \| good
2025-12-28T14:00:00.000Z	54 \| moderate	10.505 \| good	48.144 \| good	10.419 \| good	0.543 \| good	25.884 \| good	0.357 \| good
2025-12-28T15:00:00.000Z	49 \| good	8.539 \| good	37.553 \| good	10.66 \| good	0.503 \| good	16.786 \| good	0.279 \| good
2025-12-28T16:00:00.000Z	44 \| good	8.149 \| good	36.273 \| good	15.072 \| good	0.527 \| good	12.696 \| good	0.255 \| good
2025-12-28T17:00:00.000Z	38 \| good	6.914 \| good	30.672 \| good	22.358 \| good	0.506 \| good	7.674 \| good	0.234 \| good
2025-12-28T18:00:00.000Z	38 \| good	5.475 \| good	41.466 \| good	25.233 \| good	0.51 \| good	6.158 \| good	0.233 \| good
2025-12-28T19:00:00.000Z	38 \| good	6.541 \| good	38.417 \| good	29.821 \| good	0.503 \| good	8.722 \| good	0.233 \| good
2025-12-28T20:00:00.000Z	33 \| good	5.883 \| good	27.979 \| good	31.477 \| good	0.518 \| good	13.838 \| good	0.289 \| good
2025-12-28T21:00:00.000Z	38 \| good	7.439 \| good	30.888 \| good	33.154 \| good	0.545 \| good	21.727 \| good	0.274 \| good
2025-12-28T22:00:00.000Z	44 \| good	7.612 \| good	36.654 \| good	31.239 \| good	0.561 \| good	18.489 \| good	0.288 \| good
2025-12-28T23:00:00.000Z	44 \| good	8.006 \| good	38.818 \| good	30.549 \| good	0.58 \| good	19.306 \| good	0.294 \| good
2025-12-29T00:00:00.000Z	60 \| moderate	14.003 \| fine	62.791 \| fine	15.243 \| good	1.15 \| good	20.138 \| good	0.296 \| good
2025-12-29T01:00:00.000Z	60 \| moderate	13.553 \| fine	60.777 \| fine	18.021 \| good	1.386 \| good	19.795 \| good	0.286 \| good
2025-12-29T02:00:00.000Z	62 \| moderate	14.523 \| fine	65.103 \| fine	18.008 \| good	1.623 \| good	19.453 \| good	0.277 \| good
2025-12-29T03:00:00.000Z	62 \| moderate	15.146 \| fine	68.132 \| fine	17.044 \| good	1.859 \| good	19.111 \| good	0.267 \| good
2025-12-29T04:00:00.000Z	66 \| moderate	16.871 \| fine	74.987 \| fine	12.481 \| good	1.73 \| good	18.875 \| good	0.256 \| good
2025-12-29T05:00:00.000Z	69 \| moderate	18.577 \| fine	82.072 \| fine	7.228 \| good	1.6 \| good	18.64 \| good	0.246 \| good
2025-12-29T06:00:00.000Z	66 \| moderate	17.022 \| fine	75.112 \| fine	9.948 \| good	1.471 \| good	18.404 \| good	0.235 \| good
2025-12-29T07:00:00.000Z	58 \| moderate	12.585 \| fine	56.808 \| fine	16.913 \| good	1.143 \| good	14.16 \| good	0.21 \| good
2025-12-29T08:00:00.000Z	54 \| moderate	10.633 \| good	47.209 \| good	18.503 \| good	0.814 \| good	9.915 \| good	0.184 \| good
2025-12-29T09:00:00.000Z	54 \| moderate	11.154 \| good	49.513 \| good	14.404 \| good	0.486 \| good	5.67 \| good	0.159 \| good
2025-12-29T10:00:00.000Z	52 \| moderate	9.748 \| good	43.638 \| good	13.541 \| good	0.496 \| good	5.64 \| good	0.16 \| good
2025-12-29T11:00:00.000Z	44 \| good	7.537 \| good	33.235 \| good	13.779 \| good	0.506 \| good	5.61 \| good	0.162 \| good
2025-12-29T12:00:00.000Z	33 \| good	5.762 \| good	25.219 \| good	16.63 \| good	0.516 \| good	5.58 \| good	0.163 \| good
2025-12-29T13:00:00.000Z	22 \| good	4.168 \| good	18.008 \| good	18.367 \| good	0.689 \| good	6.297 \| good	0.172 \| good
2025-12-29T14:00:00.000Z	27 \| good	4.552 \| good	19.783 \| good	21.147 \| good	0.861 \| good	7.013 \| good	0.181 \| good
2025-12-29T15:00:00.000Z	27 \| good	4.589 \| good	19.848 \| good	21.987 \| good	1.034 \| good	7.729 \| good	0.19 \| good
2025-12-29T16:00:00.000Z	22 \| good	4.229 \| good	18.538 \| good	24.291 \| good	1.024 \| good	7.916 \| good	0.192 \| good
2025-12-29T17:00:00.000Z	27 \| good	5.304 \| good	22.694 \| good	23.238 \| good	1.015 \| good	8.103 \| good	0.193 \| good
2025-12-29T18:00:00.000Z	33 \| good	6.176 \| good	27.478 \| good	23.883 \| good	1.005 \| good	8.291 \| good	0.194 \| good
2025-12-29T19:00:00.000Z	44 \| good	7.511 \| good	33.141 \| good	23.021 \| good	1.079 \| good	9.571 \| good	0.201 \| good
2025-12-29T20:00:00.000Z	27 \| good	4.406 \| good	19.12 \| good	28.881 \| good	1.154 \| good	10.852 \| good	0.208 \| good
2025-12-29T21:00:00.000Z	34 \| good	2.722 \| good	10.758 \| good	36.924 \| good	1.228 \| good	12.132 \| good	0.215 \| good
2025-12-29T22:00:00.000Z	31 \| good	5.033 \| good	21.857 \| good	33.64 \| good	1.252 \| good	10.228 \| good	0.204 \| good
2025-12-29T23:00:00.000Z	33 \| good	6.499 \| good	28.62 \| good	32.539 \| good	1.277 \| good	8.324 \| good	0.193 \| good
2025-12-30T00:00:00.000Z	38 \| good	6.582 \| good	29.071 \| good	26.596 \| good	1.301 \| good	6.42 \| good	0.182 \| good
2025-12-30T01:00:00.000Z	27 \| good	5.201 \| good	22.287 \| good	25.286 \| good	1.033 \| good	5.183 \| good	0.179 \| good
2025-12-30T02:00:00.000Z	27 \| good	4.559 \| good	20.012 \| good	23.916 \| good	0.765 \| good	3.947 \| good	0.177 \| good
2025-12-30T03:00:00.000Z	22 \| good	4.35 \| good	18.925 \| good	24.097 \| good	0.498 \| good	2.71 \| good	0.174 \| good
2025-12-30T04:00:00.000Z	22 \| good	3.638 \| good	15.846 \| good	24.271 \| good	0.454 \| good	2.377 \| good	0.166 \| good
2025-12-30T05:00:00.000Z	24 \| good	3.053 \| good	12.956 \| good	26.195 \| good	0.41 \| good	2.043 \| good	0.158 \| good
2025-12-30T06:00:00.000Z	28 \| good	1.906 \| good	7.846 \| good	29.922 \| good	0.366 \| good	1.71 \| good	0.15 \| good
2025-12-30T07:00:00.000Z	29 \| good	1.18 \| good	4.815 \| good	30.858 \| good	0.349 \| good	1.536 \| good	0.146 \| good
2025-12-30T08:00:00.000Z	28 \| good	0.265 \| good	0.844 \| good	30.379 \| good	0.331 \| good	1.362 \| good	0.142 \| good
2025-12-30T09:00:00.000Z	29 \| good	0.331 \| good	1.153 \| good	31.036 \| good	0.314 \| good	1.188 \| good	0.138 \| good
2025-12-30T10:00:00.000Z	29 \| good	0.256 \| good	0.815 \| good	31.228 \| good	0.316 \| good	1.488 \| good	0.14 \| good
2025-12-30T11:00:00.000Z	29 \| good	0.372 \| good	1.116 \| good	30.547 \| good	0.319 \| good	1.788 \| good	0.143 \| good
2025-12-30T12:00:00.000Z	28 \| good	0.421 \| good	1.813 \| good	29.699 \| good	0.321 \| good	2.088 \| good	0.145 \| good
2025-12-30T13:00:00.000Z	28 \| good	0.397 \| good	1.488 \| good	30.097 \| good	0.285 \| good	1.75 \| good	0.142 \| good
2025-12-30T14:00:00.000Z	29 \| good	0.348 \| good	1 \| good	30.68 \| good	0.249 \| good	1.413 \| good	0.139 \| good
2025-12-30T15:00:00.000Z	29 \| good	0.334 \| good	1.364 \| good	30.686 \| good	0.213 \| good	1.076 \| good	0.136 \| good
2025-12-30T16:00:00.000Z	30 \| good	0.544 \| good	2 \| good	32.121 \| good	0.209 \| good	1.032 \| good	0.135 \| good
2025-12-30T17:00:00.000Z	31 \| good	0.605 \| good	2.117 \| good	33.086 \| good	0.206 \| good	0.987 \| good	0.134 \| good
2025-12-30T18:00:00.000Z	31 \| good	0.516 \| good	1.872 \| good	33.532 \| good	0.202 \| good	0.942 \| good	0.133 \| good
2025-12-30T19:00:00.000Z	31 \| good	0.305 \| good	1.116 \| good	34.483 \| good	0.21 \| good	1.196 \| good	0.134 \| good
2025-12-30T20:00:00.000Z	33 \| good	0.258 \| good	0.999 \| good	35.85 \| good	0.218 \| good	1.451 \| good	0.134 \| good
2025-12-30T21:00:00.000Z	33 \| good	0.427 \| good	1.517 \| good	36.306 \| good	0.226 \| good	1.706 \| good	0.135 \| good
2025-12-30T22:00:00.000Z	32 \| good	1.136 \| good	4.449 \| good	35.318 \| good	0.267 \| good	1.911 \| good	0.136 \| good
2025-12-30T23:00:00.000Z	32 \| good	2.256 \| good	9.024 \| good	34.554 \| good	0.308 \| good	2.116 \| good	0.137 \| good

Current air quality index in Chelmsford, Massachusetts today

Common air pollutants in Chelmsford, Massachusetts

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Chelmsford, Massachusetts air quality forecast and history

Empower business decisions with accurate air quality data

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

Air quality in nearby cities

Lowell, Massachusetts

Westford, Massachusetts

Billerica, Massachusetts

Dracut, Massachusetts

Tewksbury, Massachusetts

Tyngsborough, Massachusetts

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Frequently asked questions

How frequently does the air quality data for Chelmsford, Massachusetts get updated?

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

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

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

What pollutant is most frequently found in Chelmsford, Massachusetts?

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

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

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

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

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

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

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

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 Chelmsford, Massachusetts right now?

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

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

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

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