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

Chelmsford, Massachusetts currently has a PM10 concentration of 23.304 μg/m3.

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

The current sulfur dioxide (SO2) concentration in Chelmsford, Massachusetts is 0.459 ppb.

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

Chelmsford, Massachusetts currently has an ozone (O3) concentration of 42.348 ppm.

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

The current level of nitrogen dioxide (NO2) in Chelmsford, Massachusetts is 3.177 ppb.

Current air quality index in Chelmsford, Massachusetts today

Name: Live air pollution levels in Chelmsford, Massachusetts today
Creator: Ambee

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)

Moderate

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)

10.26 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

39.35 μg/m³

155

255

425

605+

Ozone (O₃)

18.79 ppb

201

201+

Sulfur Dioxide (SO₂)

0.48 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

22.16 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.47 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

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
2025-09-13T05:00:00.000Z	33 \| good	5.537 \| good	20.786 \| good	13.886 \| good	0.4 \| good	12.858 \| good	0.319 \| good
2025-09-13T06:00:00.000Z	33 \| good	5.713 \| good	23.27 \| good	9.645 \| good	0.427 \| good	11.19 \| good	0.3 \| good
2025-09-13T07:00:00.000Z	33 \| good	5.607 \| good	27.297 \| good	7.456 \| good	0.405 \| good	9.165 \| good	0.299 \| good
2025-09-13T08:00:00.000Z	27 \| good	5.403 \| good	23.167 \| good	5.105 \| good	0.409 \| good	8.725 \| good	0.26 \| good
2025-09-13T09:00:00.000Z	27 \| good	5.325 \| good	18.764 \| good	3.736 \| good	0.423 \| good	6.853 \| good	0.207 \| good
2025-09-13T10:00:00.000Z	33 \| good	5.624 \| good	23.029 \| good	3.306 \| good	0.423 \| good	5.69 \| good	0.226 \| good
2025-09-13T11:00:00.000Z	33 \| good	5.623 \| good	24.193 \| good	3.19 \| good	0.431 \| good	5.297 \| good	0.213 \| good
2025-09-13T12:00:00.000Z	33 \| good	5.94 \| good	25.709 \| good	4.455 \| good	0.482 \| good	5.614 \| good	0.3 \| good
2025-09-13T13:00:00.000Z	33 \| good	5.911 \| good	25.842 \| good	6.877 \| good	0.546 \| good	6.98 \| good	0.246 \| good
2025-09-13T14:00:00.000Z	33 \| good	5.819 \| good	24.324 \| good	16.882 \| good	0.523 \| good	8.095 \| good	0.187 \| good
2025-09-13T15:00:00.000Z	27 \| good	5.443 \| good	17.346 \| good	18.998 \| good	0.475 \| good	6.773 \| good	0.153 \| good
2025-09-13T16:00:00.000Z	33 \| good	5.597 \| good	20.979 \| good	23.167 \| good	0.415 \| good	5.892 \| good	0.153 \| good
2025-09-13T17:00:00.000Z	33 \| good	5.65 \| good	24.158 \| good	28.356 \| good	0.574 \| good	5.963 \| good	0.153 \| good
2025-09-13T18:00:00.000Z	34 \| good	5.77 \| good	24.264 \| good	37.096 \| good	0.367 \| good	5.067 \| good	0.153 \| good
2025-09-13T19:00:00.000Z	37 \| good	6.389 \| good	25.384 \| good	39.771 \| good	0.367 \| good	5.051 \| good	0.153 \| good
2025-09-13T20:00:00.000Z	37 \| good	6.044 \| good	25.982 \| good	39.988 \| good	0.447 \| good	6.273 \| good	0.173 \| good
2025-09-13T21:00:00.000Z	38 \| good	6.305 \| good	22.083 \| good	41.278 \| good	0.484 \| good	9.259 \| good	0.193 \| good
2025-09-13T22:00:00.000Z	34 \| good	6.019 \| good	21.743 \| good	36.764 \| good	0.488 \| good	7.811 \| good	0.193 \| good
2025-09-13T23:00:00.000Z	33 \| good	6.039 \| good	25.823 \| good	34.927 \| good	0.345 \| good	7.782 \| good	0.187 \| good
2025-09-14T00:00:00.000Z	33 \| good	6.003 \| good	22.751 \| good	32.816 \| good	0.324 \| good	6.456 \| good	0.221 \| good
2025-09-14T01:00:00.000Z	33 \| good	6.294 \| good	25.032 \| good	28.612 \| good	0.323 \| good	9.42 \| good	0.207 \| good
2025-09-14T02:00:00.000Z	33 \| good	5.974 \| good	20.346 \| good	24.606 \| good	0.434 \| good	8.025 \| good	0.207 \| good
2025-09-14T03:00:00.000Z	27 \| good	5.093 \| good	21.779 \| good	23.851 \| good	0.855 \| good	6.465 \| good	0.186 \| good
2025-09-14T04:00:00.000Z	33 \| good	5.732 \| good	23.893 \| good	23.674 \| good	0.442 \| good	7.154 \| good	0.246 \| good
2025-09-14T05:00:00.000Z	33 \| good	5.672 \| good	24.338 \| good	21.853 \| good	0.369 \| good	7.19 \| good	0.207 \| good
2025-09-14T06:00:00.000Z	33 \| good	5.588 \| good	21.791 \| good	19.911 \| good	0.414 \| good	7.088 \| good	0.207 \| good
2025-09-14T07:00:00.000Z	27 \| good	5.413 \| good	21.459 \| good	20.081 \| good	0.409 \| good	7.22 \| good	0.226 \| good
2025-09-14T08:00:00.000Z	27 \| good	5.392 \| good	19.602 \| good	15.624 \| good	0.427 \| good	6.027 \| good	0.226 \| good
2025-09-14T09:00:00.000Z	27 \| good	5.332 \| good	19.875 \| good	14.552 \| good	0.381 \| good	2.463 \| good	0.207 \| good
2025-09-14T10:00:00.000Z	27 \| good	5.482 \| good	17.752 \| good	13.579 \| good	0.382 \| good	6.671 \| good	0.173 \| good
2025-09-14T11:00:00.000Z	33 \| good	5.523 \| good	16.626 \| good	14.041 \| good	0.396 \| good	5.393 \| good	0.173 \| good
2025-09-14T12:00:00.000Z	27 \| good	5.469 \| good	19.271 \| good	15.508 \| good	0.321 \| good	6.137 \| good	0.193 \| good
2025-09-14T13:00:00.000Z	33 \| good	5.541 \| good	21.241 \| good	18.026 \| good	0.371 \| good	7.047 \| good	0.28 \| good
2025-09-14T14:00:00.000Z	33 \| good	5.572 \| good	23.655 \| good	18.396 \| good	0.342 \| good	5.997 \| good	0.24 \| good
2025-09-14T15:00:00.000Z	33 \| good	5.675 \| good	21.385 \| good	20.205 \| good	0.462 \| good	3.248 \| good	0.239 \| good
2025-09-14T16:00:00.000Z	33 \| good	6.249 \| good	28.219 \| good	27.046 \| good	0.478 \| good	2.409 \| good	0.207 \| good
2025-09-14T17:00:00.000Z	38 \| good	6.586 \| good	28.152 \| good	32.474 \| good	0.481 \| good	3.058 \| good	0.187 \| good
2025-09-14T18:00:00.000Z	38 \| good	7.149 \| good	22.417 \| good	35.501 \| good	0.453 \| good	2.51 \| good	0.207 \| good
2025-09-14T19:00:00.000Z	38 \| good	7.164 \| good	22.529 \| good	38.586 \| good	0.475 \| good	2.46 \| good	0.22 \| good
2025-09-14T20:00:00.000Z	38 \| good	7.38 \| good	19.979 \| good	39.92 \| good	0.475 \| good	2.522 \| good	0.234 \| good
2025-09-14T21:00:00.000Z	44 \| good	7.794 \| good	23.924 \| good	41.909 \| good	0.455 \| good	2.92 \| good	0.221 \| good
2025-09-14T22:00:00.000Z	39 \| good	7.178 \| good	23.304 \| good	42.348 \| good	0.459 \| good	3.177 \| good	0.234 \| good
2025-09-14T23:00:00.000Z	44 \| good	8.128 \| good	31.502 \| good	39.581 \| good	0.532 \| good	3.397 \| good	0.201 \| good
2025-09-15T00:00:00.000Z	44 \| good	7.664 \| good	32.276 \| good	33.18 \| good	0.47 \| good	9.588 \| good	0.269 \| good
2025-09-15T01:00:00.000Z	44 \| good	7.847 \| good	21.216 \| good	31.957 \| good	0.482 \| good	17.011 \| good	0.302 \| good
2025-09-15T02:00:00.000Z	44 \| good	8.242 \| good	36.293 \| good	30.309 \| good	0.523 \| good	18.7 \| good	0.375 \| good
2025-09-15T03:00:00.000Z	60 \| moderate	12.066 \| good	73.229 \| fine	21.65 \| good	0.544 \| good	24.789 \| good	0.46 \| good
2025-09-15T04:00:00.000Z	52 \| moderate	10.264 \| good	39.348 \| good	18.788 \| good	0.485 \| good	22.159 \| good	0.471 \| good
2025-09-15T04:00:00.000Z	52 \| moderate	10.264 \| good	39.348 \| good	18.788 \| good	0.485 \| good	22.159 \| good	0.471 \| good
2025-09-14T23:00:00.000Z	62 \| moderate	15.337 \| fine	68.358 \| fine	31.568 \| good	0.855 \| good	14.248 \| good	0.302 \| good
2025-09-15T00:00:00.000Z	64 \| moderate	16.32 \| fine	72.32 \| fine	30.066 \| good	0.981 \| good	19.933 \| good	0.357 \| good
2025-09-15T01:00:00.000Z	66 \| moderate	17.16 \| fine	75.397 \| fine	24.664 \| good	1.134 \| good	20.393 \| good	0.364 \| good
2025-09-15T02:00:00.000Z	71 \| moderate	20.361 \| fine	90.117 \| fine	21 \| good	1.286 \| good	20.853 \| good	0.37 \| good
2025-09-15T03:00:00.000Z	71 \| moderate	20.451 \| fine	90.004 \| fine	18.981 \| good	1.439 \| good	21.313 \| good	0.377 \| good
2025-09-15T04:00:00.000Z	73 \| moderate	21.007 \| fine	91.986 \| fine	19.099 \| good	1.374 \| good	21.042 \| good	0.38 \| good
2025-09-15T05:00:00.000Z	73 \| moderate	20.502 \| fine	89.948 \| fine	17.686 \| good	1.309 \| good	20.772 \| good	0.384 \| good
2025-09-15T06:00:00.000Z	69 \| moderate	19.333 \| fine	85.275 \| fine	17.229 \| good	1.244 \| good	20.501 \| good	0.387 \| good
2025-09-15T07:00:00.000Z	69 \| moderate	18.9 \| fine	83.517 \| fine	17.183 \| good	1.085 \| good	17.619 \| good	0.36 \| good
2025-09-15T08:00:00.000Z	69 \| moderate	18.68 \| fine	82.525 \| fine	15.67 \| good	0.925 \| good	14.737 \| good	0.334 \| good
2025-09-15T09:00:00.000Z	66 \| moderate	16.621 \| fine	73.96 \| fine	11.738 \| good	0.766 \| good	11.855 \| good	0.307 \| good
2025-09-15T10:00:00.000Z	60 \| moderate	13.915 \| fine	62.52 \| fine	9.351 \| good	0.772 \| good	10.583 \| good	0.299 \| good
2025-09-15T11:00:00.000Z	66 \| moderate	16.834 \| fine	74.115 \| fine	10.232 \| good	0.778 \| good	9.311 \| good	0.291 \| good
2025-09-15T12:00:00.000Z	71 \| moderate	20.262 \| fine	89.036 \| fine	19.534 \| good	0.783 \| good	8.039 \| good	0.283 \| good
2025-09-15T13:00:00.000Z	79 \| moderate	23.685 \| fine	103.354 \| fine	30.221 \| good	0.818 \| good	6.259 \| good	0.257 \| good
2025-09-15T14:00:00.000Z	77 \| moderate	23.325 \| fine	102.098 \| fine	38.488 \| good	0.853 \| good	4.479 \| good	0.231 \| good
2025-09-15T15:00:00.000Z	77 \| moderate	23.002 \| fine	100.93 \| fine	44.868 \| good	0.888 \| good	2.7 \| good	0.204 \| good
2025-09-15T16:00:00.000Z	71 \| moderate	20.36 \| fine	89.314 \| fine	47.369 \| good	0.815 \| good	2.334 \| good	0.197 \| good
2025-09-15T17:00:00.000Z	66 \| moderate	16.563 \| fine	73.404 \| fine	49.034 \| good	0.742 \| good	1.969 \| good	0.189 \| good
2025-09-15T18:00:00.000Z	60 \| moderate	13.733 \| fine	61.665 \| fine	49.295 \| good	0.668 \| good	1.603 \| good	0.182 \| good
2025-09-15T19:00:00.000Z	54 \| moderate	10.663 \| good	47.126 \| good	43.813 \| good	0.657 \| good	1.914 \| good	0.182 \| good
2025-09-15T20:00:00.000Z	49 \| good	9.498 \| good	42.347 \| good	40.016 \| good	0.645 \| good	2.226 \| good	0.181 \| good
2025-09-15T21:00:00.000Z	49 \| good	8.596 \| good	37.824 \| good	41.137 \| good	0.633 \| good	2.537 \| good	0.181 \| good
2025-09-15T22:00:00.000Z	44 \| good	8.021 \| good	35.194 \| good	37.886 \| good	0.74 \| good	4.846 \| good	0.197 \| good
2025-09-15T23:00:00.000Z	49 \| good	8.89 \| good	39.178 \| good	30.238 \| good	0.846 \| good	7.155 \| good	0.212 \| good
2025-09-16T00:00:00.000Z	56 \| moderate	11.511 \| good	51.183 \| good	26.197 \| good	0.953 \| good	9.464 \| good	0.228 \| good
2025-09-16T01:00:00.000Z	56 \| moderate	12.126 \| fine	54.644 \| good	20.683 \| good	1.022 \| good	10.162 \| good	0.232 \| good
2025-09-16T02:00:00.000Z	60 \| moderate	13.687 \| fine	61.186 \| fine	18.993 \| good	1.091 \| good	10.861 \| good	0.236 \| good
2025-09-16T03:00:00.000Z	60 \| moderate	14.322 \| fine	64.299 \| fine	19.349 \| good	1.16 \| good	11.559 \| good	0.24 \| good
2025-09-16T04:00:00.000Z	58 \| moderate	12.908 \| fine	58.42 \| fine	17.177 \| good	1.184 \| good	11.824 \| good	0.245 \| good
2025-09-16T05:00:00.000Z	58 \| moderate	13.186 \| fine	58.718 \| fine	15.916 \| good	1.209 \| good	12.09 \| good	0.249 \| good
2025-09-16T06:00:00.000Z	58 \| moderate	12.9 \| fine	58.303 \| fine	13.782 \| good	1.233 \| good	12.356 \| good	0.254 \| good
2025-09-16T07:00:00.000Z	58 \| moderate	12.864 \| fine	58.325 \| fine	11.498 \| good	1.194 \| good	12.233 \| good	0.255 \| good
2025-09-16T08:00:00.000Z	58 \| moderate	12.917 \| fine	58.451 \| fine	10.641 \| good	1.156 \| good	12.109 \| good	0.256 \| good
2025-09-16T09:00:00.000Z	58 \| moderate	13.417 \| fine	60.49 \| fine	10.108 \| good	1.118 \| good	11.986 \| good	0.257 \| good
2025-09-16T10:00:00.000Z	64 \| moderate	15.701 \| fine	70.052 \| fine	8.675 \| good	1.055 \| good	12.145 \| good	0.281 \| good
2025-09-16T11:00:00.000Z	67 \| moderate	17.592 \| fine	78.248 \| fine	8.904 \| good	0.991 \| good	12.305 \| good	0.305 \| good
2025-09-16T12:00:00.000Z	66 \| moderate	17.301 \| fine	76.793 \| fine	17.555 \| good	0.927 \| good	12.464 \| good	0.329 \| good
2025-09-16T13:00:00.000Z	64 \| moderate	15.895 \| fine	70.696 \| fine	29.434 \| good	1.149 \| good	9.965 \| good	0.29 \| good
2025-09-16T14:00:00.000Z	64 \| moderate	15.9 \| fine	70.816 \| fine	39.753 \| good	1.371 \| good	7.467 \| good	0.251 \| good
2025-09-16T15:00:00.000Z	66 \| moderate	16.575 \| fine	72.943 \| fine	48.145 \| good	1.593 \| good	4.968 \| good	0.212 \| good
2025-09-16T16:00:00.000Z	64 \| moderate	16.209 \| fine	71.733 \| fine	52 \| good	1.374 \| good	4.103 \| good	0.204 \| good
2025-09-16T17:00:00.000Z	62 \| moderate	14.694 \| fine	65.862 \| fine	55.731 \| fine	1.156 \| good	3.239 \| good	0.195 \| good
2025-09-16T18:00:00.000Z	61 \| moderate	14.488 \| fine	64.101 \| fine	58.314 \| fine	0.937 \| good	2.374 \| good	0.187 \| good
2025-09-16T19:00:00.000Z	67 \| moderate	14.526 \| fine	65.032 \| fine	60.325 \| fine	0.893 \| good	2.53 \| good	0.187 \| good
2025-09-16T20:00:00.000Z	64 \| moderate	13.269 \| fine	60.003 \| fine	59.341 \| fine	0.85 \| good	2.685 \| good	0.187 \| good
2025-09-16T21:00:00.000Z	49 \| good	8.99 \| good	39.271 \| good	38.832 \| good	0.806 \| good	2.841 \| good	0.187 \| good
2025-09-16T22:00:00.000Z	21 \| good	2.782 \| good	11.452 \| good	23.405 \| good	0.855 \| good	5.108 \| good	0.201 \| good

Chelmsford

Empower business decisions with accurate air quality data

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

0.22ppm

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 09:00:00, 2025-09-14.

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

The best air quality in Chelmsford, Massachusetts was observed at 12:00:00 on 2025-09-14.

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

The air quality in Chelmsford, Massachusetts right now is Good, with an AQI of 39.

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 7.178 μg/m³.

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

Chelmsford, Massachusetts currently has a PM₁₀ concentration of 23.304 μg/m³.

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

The current carbon monoxide (CO) level in Chelmsford, Massachusetts is 0.234 ppm.

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

The current sulfur dioxide (SO₂) concentration in Chelmsford, Massachusetts is 0.459 ppb.

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

Chelmsford, Massachusetts currently has an ozone (O₃) concentration of 42.348 ppm.

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

The current level of nitrogen dioxide (NO₂) in Chelmsford, Massachusetts is 3.177 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-09-13T05:00:00.000Z	33 \| good	5.537 \| good	20.786 \| good	13.886 \| good	0.4 \| good	12.858 \| good	0.319 \| good
2025-09-13T06:00:00.000Z	33 \| good	5.713 \| good	23.27 \| good	9.645 \| good	0.427 \| good	11.19 \| good	0.3 \| good
2025-09-13T07:00:00.000Z	33 \| good	5.607 \| good	27.297 \| good	7.456 \| good	0.405 \| good	9.165 \| good	0.299 \| good
2025-09-13T08:00:00.000Z	27 \| good	5.403 \| good	23.167 \| good	5.105 \| good	0.409 \| good	8.725 \| good	0.26 \| good
2025-09-13T09:00:00.000Z	27 \| good	5.325 \| good	18.764 \| good	3.736 \| good	0.423 \| good	6.853 \| good	0.207 \| good
2025-09-13T10:00:00.000Z	33 \| good	5.624 \| good	23.029 \| good	3.306 \| good	0.423 \| good	5.69 \| good	0.226 \| good
2025-09-13T11:00:00.000Z	33 \| good	5.623 \| good	24.193 \| good	3.19 \| good	0.431 \| good	5.297 \| good	0.213 \| good
2025-09-13T12:00:00.000Z	33 \| good	5.94 \| good	25.709 \| good	4.455 \| good	0.482 \| good	5.614 \| good	0.3 \| good
2025-09-13T13:00:00.000Z	33 \| good	5.911 \| good	25.842 \| good	6.877 \| good	0.546 \| good	6.98 \| good	0.246 \| good
2025-09-13T14:00:00.000Z	33 \| good	5.819 \| good	24.324 \| good	16.882 \| good	0.523 \| good	8.095 \| good	0.187 \| good
2025-09-13T15:00:00.000Z	27 \| good	5.443 \| good	17.346 \| good	18.998 \| good	0.475 \| good	6.773 \| good	0.153 \| good
2025-09-13T16:00:00.000Z	33 \| good	5.597 \| good	20.979 \| good	23.167 \| good	0.415 \| good	5.892 \| good	0.153 \| good
2025-09-13T17:00:00.000Z	33 \| good	5.65 \| good	24.158 \| good	28.356 \| good	0.574 \| good	5.963 \| good	0.153 \| good
2025-09-13T18:00:00.000Z	34 \| good	5.77 \| good	24.264 \| good	37.096 \| good	0.367 \| good	5.067 \| good	0.153 \| good
2025-09-13T19:00:00.000Z	37 \| good	6.389 \| good	25.384 \| good	39.771 \| good	0.367 \| good	5.051 \| good	0.153 \| good
2025-09-13T20:00:00.000Z	37 \| good	6.044 \| good	25.982 \| good	39.988 \| good	0.447 \| good	6.273 \| good	0.173 \| good
2025-09-13T21:00:00.000Z	38 \| good	6.305 \| good	22.083 \| good	41.278 \| good	0.484 \| good	9.259 \| good	0.193 \| good
2025-09-13T22:00:00.000Z	34 \| good	6.019 \| good	21.743 \| good	36.764 \| good	0.488 \| good	7.811 \| good	0.193 \| good
2025-09-13T23:00:00.000Z	33 \| good	6.039 \| good	25.823 \| good	34.927 \| good	0.345 \| good	7.782 \| good	0.187 \| good
2025-09-14T00:00:00.000Z	33 \| good	6.003 \| good	22.751 \| good	32.816 \| good	0.324 \| good	6.456 \| good	0.221 \| good
2025-09-14T01:00:00.000Z	33 \| good	6.294 \| good	25.032 \| good	28.612 \| good	0.323 \| good	9.42 \| good	0.207 \| good
2025-09-14T02:00:00.000Z	33 \| good	5.974 \| good	20.346 \| good	24.606 \| good	0.434 \| good	8.025 \| good	0.207 \| good
2025-09-14T03:00:00.000Z	27 \| good	5.093 \| good	21.779 \| good	23.851 \| good	0.855 \| good	6.465 \| good	0.186 \| good
2025-09-14T04:00:00.000Z	33 \| good	5.732 \| good	23.893 \| good	23.674 \| good	0.442 \| good	7.154 \| good	0.246 \| good
2025-09-14T05:00:00.000Z	33 \| good	5.672 \| good	24.338 \| good	21.853 \| good	0.369 \| good	7.19 \| good	0.207 \| good
2025-09-14T06:00:00.000Z	33 \| good	5.588 \| good	21.791 \| good	19.911 \| good	0.414 \| good	7.088 \| good	0.207 \| good
2025-09-14T07:00:00.000Z	27 \| good	5.413 \| good	21.459 \| good	20.081 \| good	0.409 \| good	7.22 \| good	0.226 \| good
2025-09-14T08:00:00.000Z	27 \| good	5.392 \| good	19.602 \| good	15.624 \| good	0.427 \| good	6.027 \| good	0.226 \| good
2025-09-14T09:00:00.000Z	27 \| good	5.332 \| good	19.875 \| good	14.552 \| good	0.381 \| good	2.463 \| good	0.207 \| good
2025-09-14T10:00:00.000Z	27 \| good	5.482 \| good	17.752 \| good	13.579 \| good	0.382 \| good	6.671 \| good	0.173 \| good
2025-09-14T11:00:00.000Z	33 \| good	5.523 \| good	16.626 \| good	14.041 \| good	0.396 \| good	5.393 \| good	0.173 \| good
2025-09-14T12:00:00.000Z	27 \| good	5.469 \| good	19.271 \| good	15.508 \| good	0.321 \| good	6.137 \| good	0.193 \| good
2025-09-14T13:00:00.000Z	33 \| good	5.541 \| good	21.241 \| good	18.026 \| good	0.371 \| good	7.047 \| good	0.28 \| good
2025-09-14T14:00:00.000Z	33 \| good	5.572 \| good	23.655 \| good	18.396 \| good	0.342 \| good	5.997 \| good	0.24 \| good
2025-09-14T15:00:00.000Z	33 \| good	5.675 \| good	21.385 \| good	20.205 \| good	0.462 \| good	3.248 \| good	0.239 \| good
2025-09-14T16:00:00.000Z	33 \| good	6.249 \| good	28.219 \| good	27.046 \| good	0.478 \| good	2.409 \| good	0.207 \| good
2025-09-14T17:00:00.000Z	38 \| good	6.586 \| good	28.152 \| good	32.474 \| good	0.481 \| good	3.058 \| good	0.187 \| good
2025-09-14T18:00:00.000Z	38 \| good	7.149 \| good	22.417 \| good	35.501 \| good	0.453 \| good	2.51 \| good	0.207 \| good
2025-09-14T19:00:00.000Z	38 \| good	7.164 \| good	22.529 \| good	38.586 \| good	0.475 \| good	2.46 \| good	0.22 \| good
2025-09-14T20:00:00.000Z	38 \| good	7.38 \| good	19.979 \| good	39.92 \| good	0.475 \| good	2.522 \| good	0.234 \| good
2025-09-14T21:00:00.000Z	44 \| good	7.794 \| good	23.924 \| good	41.909 \| good	0.455 \| good	2.92 \| good	0.221 \| good
2025-09-14T22:00:00.000Z	39 \| good	7.178 \| good	23.304 \| good	42.348 \| good	0.459 \| good	3.177 \| good	0.234 \| good
2025-09-14T23:00:00.000Z	44 \| good	8.128 \| good	31.502 \| good	39.581 \| good	0.532 \| good	3.397 \| good	0.201 \| good
2025-09-15T00:00:00.000Z	44 \| good	7.664 \| good	32.276 \| good	33.18 \| good	0.47 \| good	9.588 \| good	0.269 \| good
2025-09-15T01:00:00.000Z	44 \| good	7.847 \| good	21.216 \| good	31.957 \| good	0.482 \| good	17.011 \| good	0.302 \| good
2025-09-15T02:00:00.000Z	44 \| good	8.242 \| good	36.293 \| good	30.309 \| good	0.523 \| good	18.7 \| good	0.375 \| good
2025-09-15T03:00:00.000Z	60 \| moderate	12.066 \| good	73.229 \| fine	21.65 \| good	0.544 \| good	24.789 \| good	0.46 \| good
2025-09-15T04:00:00.000Z	52 \| moderate	10.264 \| good	39.348 \| good	18.788 \| good	0.485 \| good	22.159 \| good	0.471 \| good
2025-09-15T04:00:00.000Z	52 \| moderate	10.264 \| good	39.348 \| good	18.788 \| good	0.485 \| good	22.159 \| good	0.471 \| good
2025-09-14T23:00:00.000Z	62 \| moderate	15.337 \| fine	68.358 \| fine	31.568 \| good	0.855 \| good	14.248 \| good	0.302 \| good
2025-09-15T00:00:00.000Z	64 \| moderate	16.32 \| fine	72.32 \| fine	30.066 \| good	0.981 \| good	19.933 \| good	0.357 \| good
2025-09-15T01:00:00.000Z	66 \| moderate	17.16 \| fine	75.397 \| fine	24.664 \| good	1.134 \| good	20.393 \| good	0.364 \| good
2025-09-15T02:00:00.000Z	71 \| moderate	20.361 \| fine	90.117 \| fine	21 \| good	1.286 \| good	20.853 \| good	0.37 \| good
2025-09-15T03:00:00.000Z	71 \| moderate	20.451 \| fine	90.004 \| fine	18.981 \| good	1.439 \| good	21.313 \| good	0.377 \| good
2025-09-15T04:00:00.000Z	73 \| moderate	21.007 \| fine	91.986 \| fine	19.099 \| good	1.374 \| good	21.042 \| good	0.38 \| good
2025-09-15T05:00:00.000Z	73 \| moderate	20.502 \| fine	89.948 \| fine	17.686 \| good	1.309 \| good	20.772 \| good	0.384 \| good
2025-09-15T06:00:00.000Z	69 \| moderate	19.333 \| fine	85.275 \| fine	17.229 \| good	1.244 \| good	20.501 \| good	0.387 \| good
2025-09-15T07:00:00.000Z	69 \| moderate	18.9 \| fine	83.517 \| fine	17.183 \| good	1.085 \| good	17.619 \| good	0.36 \| good
2025-09-15T08:00:00.000Z	69 \| moderate	18.68 \| fine	82.525 \| fine	15.67 \| good	0.925 \| good	14.737 \| good	0.334 \| good
2025-09-15T09:00:00.000Z	66 \| moderate	16.621 \| fine	73.96 \| fine	11.738 \| good	0.766 \| good	11.855 \| good	0.307 \| good
2025-09-15T10:00:00.000Z	60 \| moderate	13.915 \| fine	62.52 \| fine	9.351 \| good	0.772 \| good	10.583 \| good	0.299 \| good
2025-09-15T11:00:00.000Z	66 \| moderate	16.834 \| fine	74.115 \| fine	10.232 \| good	0.778 \| good	9.311 \| good	0.291 \| good
2025-09-15T12:00:00.000Z	71 \| moderate	20.262 \| fine	89.036 \| fine	19.534 \| good	0.783 \| good	8.039 \| good	0.283 \| good
2025-09-15T13:00:00.000Z	79 \| moderate	23.685 \| fine	103.354 \| fine	30.221 \| good	0.818 \| good	6.259 \| good	0.257 \| good
2025-09-15T14:00:00.000Z	77 \| moderate	23.325 \| fine	102.098 \| fine	38.488 \| good	0.853 \| good	4.479 \| good	0.231 \| good
2025-09-15T15:00:00.000Z	77 \| moderate	23.002 \| fine	100.93 \| fine	44.868 \| good	0.888 \| good	2.7 \| good	0.204 \| good
2025-09-15T16:00:00.000Z	71 \| moderate	20.36 \| fine	89.314 \| fine	47.369 \| good	0.815 \| good	2.334 \| good	0.197 \| good
2025-09-15T17:00:00.000Z	66 \| moderate	16.563 \| fine	73.404 \| fine	49.034 \| good	0.742 \| good	1.969 \| good	0.189 \| good
2025-09-15T18:00:00.000Z	60 \| moderate	13.733 \| fine	61.665 \| fine	49.295 \| good	0.668 \| good	1.603 \| good	0.182 \| good
2025-09-15T19:00:00.000Z	54 \| moderate	10.663 \| good	47.126 \| good	43.813 \| good	0.657 \| good	1.914 \| good	0.182 \| good
2025-09-15T20:00:00.000Z	49 \| good	9.498 \| good	42.347 \| good	40.016 \| good	0.645 \| good	2.226 \| good	0.181 \| good
2025-09-15T21:00:00.000Z	49 \| good	8.596 \| good	37.824 \| good	41.137 \| good	0.633 \| good	2.537 \| good	0.181 \| good
2025-09-15T22:00:00.000Z	44 \| good	8.021 \| good	35.194 \| good	37.886 \| good	0.74 \| good	4.846 \| good	0.197 \| good
2025-09-15T23:00:00.000Z	49 \| good	8.89 \| good	39.178 \| good	30.238 \| good	0.846 \| good	7.155 \| good	0.212 \| good
2025-09-16T00:00:00.000Z	56 \| moderate	11.511 \| good	51.183 \| good	26.197 \| good	0.953 \| good	9.464 \| good	0.228 \| good
2025-09-16T01:00:00.000Z	56 \| moderate	12.126 \| fine	54.644 \| good	20.683 \| good	1.022 \| good	10.162 \| good	0.232 \| good
2025-09-16T02:00:00.000Z	60 \| moderate	13.687 \| fine	61.186 \| fine	18.993 \| good	1.091 \| good	10.861 \| good	0.236 \| good
2025-09-16T03:00:00.000Z	60 \| moderate	14.322 \| fine	64.299 \| fine	19.349 \| good	1.16 \| good	11.559 \| good	0.24 \| good
2025-09-16T04:00:00.000Z	58 \| moderate	12.908 \| fine	58.42 \| fine	17.177 \| good	1.184 \| good	11.824 \| good	0.245 \| good
2025-09-16T05:00:00.000Z	58 \| moderate	13.186 \| fine	58.718 \| fine	15.916 \| good	1.209 \| good	12.09 \| good	0.249 \| good
2025-09-16T06:00:00.000Z	58 \| moderate	12.9 \| fine	58.303 \| fine	13.782 \| good	1.233 \| good	12.356 \| good	0.254 \| good
2025-09-16T07:00:00.000Z	58 \| moderate	12.864 \| fine	58.325 \| fine	11.498 \| good	1.194 \| good	12.233 \| good	0.255 \| good
2025-09-16T08:00:00.000Z	58 \| moderate	12.917 \| fine	58.451 \| fine	10.641 \| good	1.156 \| good	12.109 \| good	0.256 \| good
2025-09-16T09:00:00.000Z	58 \| moderate	13.417 \| fine	60.49 \| fine	10.108 \| good	1.118 \| good	11.986 \| good	0.257 \| good
2025-09-16T10:00:00.000Z	64 \| moderate	15.701 \| fine	70.052 \| fine	8.675 \| good	1.055 \| good	12.145 \| good	0.281 \| good
2025-09-16T11:00:00.000Z	67 \| moderate	17.592 \| fine	78.248 \| fine	8.904 \| good	0.991 \| good	12.305 \| good	0.305 \| good
2025-09-16T12:00:00.000Z	66 \| moderate	17.301 \| fine	76.793 \| fine	17.555 \| good	0.927 \| good	12.464 \| good	0.329 \| good
2025-09-16T13:00:00.000Z	64 \| moderate	15.895 \| fine	70.696 \| fine	29.434 \| good	1.149 \| good	9.965 \| good	0.29 \| good
2025-09-16T14:00:00.000Z	64 \| moderate	15.9 \| fine	70.816 \| fine	39.753 \| good	1.371 \| good	7.467 \| good	0.251 \| good
2025-09-16T15:00:00.000Z	66 \| moderate	16.575 \| fine	72.943 \| fine	48.145 \| good	1.593 \| good	4.968 \| good	0.212 \| good
2025-09-16T16:00:00.000Z	64 \| moderate	16.209 \| fine	71.733 \| fine	52 \| good	1.374 \| good	4.103 \| good	0.204 \| good
2025-09-16T17:00:00.000Z	62 \| moderate	14.694 \| fine	65.862 \| fine	55.731 \| fine	1.156 \| good	3.239 \| good	0.195 \| good
2025-09-16T18:00:00.000Z	61 \| moderate	14.488 \| fine	64.101 \| fine	58.314 \| fine	0.937 \| good	2.374 \| good	0.187 \| good
2025-09-16T19:00:00.000Z	67 \| moderate	14.526 \| fine	65.032 \| fine	60.325 \| fine	0.893 \| good	2.53 \| good	0.187 \| good
2025-09-16T20:00:00.000Z	64 \| moderate	13.269 \| fine	60.003 \| fine	59.341 \| fine	0.85 \| good	2.685 \| good	0.187 \| good
2025-09-16T21:00:00.000Z	49 \| good	8.99 \| good	39.271 \| good	38.832 \| good	0.806 \| good	2.841 \| good	0.187 \| good
2025-09-16T22:00:00.000Z	21 \| good	2.782 \| good	11.452 \| good	23.405 \| good	0.855 \| good	5.108 \| good	0.201 \| 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

How accurate is Massachusetts, USA air quality data?

Air quality levels in US

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?