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

Chelmsford, Massachusetts currently has a PM10 concentration of 35.915 μg/m3.

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

The current sulfur dioxide (SO2) concentration in Chelmsford, Massachusetts is 1.036 ppb.

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

Chelmsford, Massachusetts currently has an ozone (O3) concentration of 45.693 ppm.

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

The current level of nitrogen dioxide (NO2) in Chelmsford, Massachusetts is 3.403 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)

10.74 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

35.56 μg/m³

155

255

425

605+

Ozone (O₃)

24.92 ppb

201

201+

Sulfur Dioxide (SO₂)

0.71 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

9.81 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.23 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
2025-07-29T08:00:00.000Z	58 \| moderate	12.742 \| fine	49.183 \| good	13.459 \| good	0.348 \| good	17.752 \| good	0.224 \| good
2025-07-29T09:00:00.000Z	60 \| moderate	13.671 \| fine	55.985 \| fine	18.274 \| good	0.3 \| good	11.768 \| good	0.227 \| good
2025-07-29T10:00:00.000Z	60 \| moderate	13.907 \| fine	61.512 \| fine	12.974 \| good	0.36 \| good	8.724 \| good	0.227 \| good
2025-07-29T11:00:00.000Z	60 \| moderate	14.396 \| fine	61.8 \| fine	12.65 \| good	0.277 \| good	9.083 \| good	0.248 \| good
2025-07-29T12:00:00.000Z	60 \| moderate	14.448 \| fine	62.767 \| fine	19.548 \| good	0.269 \| good	11.706 \| good	0.294 \| good
2025-07-29T13:00:00.000Z	62 \| moderate	14.637 \| fine	60.05 \| fine	21.214 \| good	1.295 \| good	11.569 \| good	0.261 \| good
2025-07-29T14:00:00.000Z	62 \| moderate	14.595 \| fine	63.219 \| fine	25.874 \| good	0.78 \| good	9.766 \| good	0.298 \| good
2025-07-29T15:00:00.000Z	62 \| moderate	14.505 \| fine	61.192 \| fine	31.509 \| good	2.804 \| good	6.898 \| good	0.27 \| good
2025-07-29T16:00:00.000Z	62 \| moderate	14.561 \| fine	57.796 \| fine	35.087 \| good	1.183 \| good	6.828 \| good	0.243 \| good
2025-07-29T17:00:00.000Z	60 \| moderate	13.746 \| fine	59.237 \| fine	37.531 \| good	1.056 \| good	8.361 \| good	0.243 \| good
2025-07-29T18:00:00.000Z	58 \| moderate	12.984 \| fine	57.408 \| fine	44.071 \| good	1.888 \| good	7.35 \| good	0.227 \| good
2025-07-29T19:00:00.000Z	56 \| moderate	12.124 \| fine	52.117 \| good	46.799 \| good	1.824 \| good	9.002 \| good	0.216 \| good
2025-07-29T20:00:00.000Z	54 \| moderate	11.118 \| good	48.311 \| good	46.957 \| good	1.234 \| good	6.485 \| good	0.255 \| good
2025-07-29T21:00:00.000Z	52 \| moderate	10.387 \| good	43.723 \| good	48.354 \| good	0.953 \| good	4.805 \| good	0.243 \| good
2025-07-29T22:00:00.000Z	52 \| moderate	9.615 \| good	41.795 \| good	46.609 \| good	1.792 \| good	4.789 \| good	0.234 \| good
2025-07-29T23:00:00.000Z	49 \| good	8.932 \| good	36.883 \| good	46.71 \| good	0.987 \| good	3.781 \| good	0.234 \| good
2025-07-30T00:00:00.000Z	44 \| good	8.294 \| good	34.586 \| good	43.216 \| good	0.955 \| good	3.057 \| good	0.222 \| good
2025-07-30T01:00:00.000Z	44 \| good	8.207 \| good	32.663 \| good	38.705 \| good	0.53 \| good	3.2 \| good	0.185 \| good
2025-07-30T02:00:00.000Z	44 \| good	8.174 \| good	35.531 \| good	32.977 \| good	0.351 \| good	4.9 \| good	0.186 \| good
2025-07-30T03:00:00.000Z	71 \| moderate	20.38 \| fine	89.641 \| fine	21.108 \| good	0.764 \| good	12.139 \| good	0.273 \| good
2025-07-30T04:00:00.000Z	49 \| good	8.698 \| good	35.985 \| good	25.388 \| good	0.374 \| good	17.097 \| good	0.273 \| good
2025-07-30T05:00:00.000Z	44 \| good	8.45 \| good	34.263 \| good	27.881 \| good	0.419 \| good	16.387 \| good	0.319 \| good
2025-07-30T06:00:00.000Z	49 \| good	8.524 \| good	33.29 \| good	26.348 \| good	0.338 \| good	16.189 \| good	0.281 \| good
2025-07-30T07:00:00.000Z	44 \| good	8.075 \| good	46.226 \| good	17.701 \| good	0.467 \| good	13.032 \| good	0.321 \| good
2025-07-30T08:00:00.000Z	49 \| good	9.075 \| good	39.83 \| good	20.004 \| good	0.516 \| good	13.496 \| good	0.303 \| good
2025-07-30T09:00:00.000Z	49 \| good	9.04 \| good	45.138 \| good	13.709 \| good	0.513 \| good	14.374 \| good	0.256 \| good
2025-07-30T10:00:00.000Z	49 \| good	8.974 \| good	36.576 \| good	12.946 \| good	0.412 \| good	13.107 \| good	0.256 \| good
2025-07-30T11:00:00.000Z	49 \| good	9.091 \| good	40.315 \| good	13.641 \| good	0.526 \| good	11.567 \| good	0.269 \| good
2025-07-30T12:00:00.000Z	49 \| good	8.994 \| good	41.241 \| good	13.721 \| good	0.597 \| good	9.837 \| good	0.324 \| good
2025-07-30T13:00:00.000Z	49 \| good	9.189 \| good	40.693 \| good	18.846 \| good	0.703 \| good	9.272 \| good	0.33 \| good
2025-07-30T14:00:00.000Z	49 \| good	9.217 \| good	37.429 \| good	26.684 \| good	1.041 \| good	10.279 \| good	0.296 \| good
2025-07-30T15:00:00.000Z	49 \| good	9.339 \| good	41.156 \| good	30.935 \| good	1.542 \| good	12.461 \| good	0.281 \| good
2025-07-30T16:00:00.000Z	52 \| moderate	9.802 \| good	40.881 \| good	34.057 \| good	1.264 \| good	7.163 \| good	0.271 \| good
2025-07-30T17:00:00.000Z	52 \| moderate	9.592 \| good	42.471 \| good	39.93 \| good	1.189 \| good	6.586 \| good	0.281 \| good
2025-07-30T18:00:00.000Z	52 \| moderate	9.524 \| good	41.719 \| good	40.655 \| good	0.601 \| good	7.014 \| good	0.268 \| good
2025-07-30T19:00:00.000Z	49 \| good	9.433 \| good	40.512 \| good	41.974 \| good	0.541 \| good	6.272 \| good	0.268 \| good
2025-07-30T20:00:00.000Z	49 \| good	9.354 \| good	37.216 \| good	43.403 \| good	0.456 \| good	10.901 \| good	0.268 \| good
2025-07-30T21:00:00.000Z	49 \| good	9.316 \| good	41.175 \| good	44.054 \| good	0.479 \| good	11.164 \| good	0.264 \| good
2025-07-30T22:00:00.000Z	49 \| good	8.978 \| good	38.255 \| good	40.276 \| good	0.435 \| good	9.656 \| good	0.298 \| good
2025-07-30T23:00:00.000Z	44 \| good	8.272 \| good	34.831 \| good	39.587 \| good	0.57 \| good	10.576 \| good	0.239 \| good
2025-07-31T00:00:00.000Z	44 \| good	8.257 \| good	35.811 \| good	41.966 \| good	0.335 \| good	11.277 \| good	0.239 \| good
2025-07-31T01:00:00.000Z	44 \| good	7.71 \| good	33.345 \| good	38.303 \| good	0.324 \| good	13.482 \| good	0.282 \| good
2025-07-31T02:00:00.000Z	38 \| good	7.295 \| good	31.169 \| good	37.227 \| good	0.309 \| good	6.731 \| good	0.261 \| good
2025-07-31T03:00:00.000Z	38 \| good	7.177 \| good	30.545 \| good	33.712 \| good	0.422 \| good	5.413 \| good	0.239 \| good
2025-07-31T04:00:00.000Z	38 \| good	7.442 \| good	31.767 \| good	31.261 \| good	0.383 \| good	5.705 \| good	0.241 \| good
2025-07-31T05:00:00.000Z	38 \| good	7.111 \| good	30.765 \| good	35.467 \| good	0.487 \| good	10.085 \| good	0.286 \| good
2025-07-31T06:00:00.000Z	52 \| moderate	10.45 \| good	45.799 \| good	31.356 \| good	0.983 \| good	8.434 \| good	0.333 \| good
2025-07-31T07:00:00.000Z	56 \| moderate	11.76 \| good	39.499 \| good	23.446 \| good	0.686 \| good	9.966 \| good	0.227 \| good
2025-07-31T07:00:00.000Z	54 \| moderate	10.737 \| good	35.562 \| good	24.923 \| good	0.706 \| good	9.812 \| good	0.235 \| good
2025-07-30T01:00:00.000Z	66 \| moderate	16.841 \| fine	74.305 \| fine	23.289 \| good	0.531 \| good	7.989 \| good	0.231 \| good
2025-07-30T02:00:00.000Z	79 \| moderate	23.778 \| fine	103.851 \| fine	24.611 \| good	0.545 \| good	8.683 \| good	0.241 \| good
2025-07-30T03:00:00.000Z	88 \| moderate	28.947 \| fine	125.196 \| fine	26.284 \| good	0.559 \| good	9.378 \| good	0.251 \| good
2025-07-30T04:00:00.000Z	92 \| moderate	30.824 \| fine	133.826 \| fine	26.03 \| good	0.547 \| good	8.764 \| good	0.251 \| good
2025-07-30T05:00:00.000Z	94 \| moderate	31.837 \| fine	137.918 \| fine	20.963 \| good	0.536 \| good	8.151 \| good	0.251 \| good
2025-07-30T06:00:00.000Z	96 \| moderate	32.647 \| fine	141.607 \| fine	17.171 \| good	0.524 \| good	7.537 \| good	0.251 \| good
2025-07-30T07:00:00.000Z	94 \| moderate	31.851 \| fine	137.783 \| fine	17.316 \| good	0.544 \| good	7.699 \| good	0.257 \| good
2025-07-30T08:00:00.000Z	88 \| moderate	29.22 \| fine	126.693 \| fine	17.855 \| good	0.563 \| good	7.86 \| good	0.262 \| good
2025-07-30T09:00:00.000Z	92 \| moderate	31.087 \| fine	134.709 \| fine	17.158 \| good	0.582 \| good	8.022 \| good	0.268 \| good
2025-07-30T10:00:00.000Z	84 \| moderate	27.285 \| fine	118.929 \| fine	16.317 \| good	0.685 \| good	7.613 \| good	0.28 \| good
2025-07-30T11:00:00.000Z	73 \| moderate	21.457 \| fine	94.841 \| fine	21.176 \| good	0.789 \| good	7.205 \| good	0.292 \| good
2025-07-30T12:00:00.000Z	71 \| moderate	20.313 \| fine	89.641 \| fine	28.093 \| good	0.893 \| good	6.797 \| good	0.304 \| good
2025-07-30T13:00:00.000Z	77 \| moderate	23.456 \| fine	102.607 \| fine	32.329 \| good	0.953 \| good	5.507 \| good	0.284 \| good
2025-07-30T14:00:00.000Z	82 \| moderate	25.922 \| fine	112.761 \| fine	40.924 \| good	1.012 \| good	4.217 \| good	0.264 \| good
2025-07-30T15:00:00.000Z	84 \| moderate	27.13 \| fine	117.938 \| fine	48.56 \| good	1.072 \| good	2.927 \| good	0.245 \| good
2025-07-30T16:00:00.000Z	81 \| moderate	25.095 \| fine	109.262 \| fine	49.312 \| good	0.897 \| good	2.411 \| good	0.232 \| good
2025-07-30T17:00:00.000Z	75 \| moderate	21.507 \| fine	94.351 \| fine	48 \| good	0.722 \| good	1.895 \| good	0.219 \| good
2025-07-30T18:00:00.000Z	69 \| moderate	18.925 \| fine	83.592 \| fine	49.223 \| good	0.547 \| good	1.38 \| good	0.205 \| good
2025-07-30T19:00:00.000Z	69 \| moderate	18.655 \| fine	82.542 \| fine	51.732 \| good	0.472 \| good	1.425 \| good	0.196 \| good
2025-07-30T20:00:00.000Z	64 \| moderate	16.168 \| fine	71.644 \| fine	48.058 \| good	0.398 \| good	1.47 \| good	0.187 \| good
2025-07-30T21:00:00.000Z	62 \| moderate	15.056 \| fine	67.122 \| fine	49.328 \| good	0.323 \| good	1.515 \| good	0.178 \| good
2025-07-30T22:00:00.000Z	60 \| moderate	14.243 \| fine	64.293 \| fine	48.945 \| good	0.379 \| good	3.445 \| good	0.194 \| good
2025-07-30T23:00:00.000Z	60 \| moderate	14.085 \| fine	63.193 \| fine	44.787 \| good	0.434 \| good	5.375 \| good	0.21 \| good
2025-07-31T00:00:00.000Z	71 \| moderate	19.59 \| fine	86.919 \| fine	40.202 \| good	0.49 \| good	7.305 \| good	0.225 \| good
2025-07-31T01:00:00.000Z	69 \| moderate	19.455 \| fine	85.854 \| fine	36.576 \| good	0.576 \| good	9.623 \| good	0.25 \| good
2025-07-31T02:00:00.000Z	73 \| moderate	21.435 \| fine	93.757 \| fine	31.464 \| good	0.662 \| good	11.941 \| good	0.275 \| good
2025-07-31T03:00:00.000Z	77 \| moderate	23.337 \| fine	102.473 \| fine	31.95 \| good	0.748 \| good	14.258 \| good	0.3 \| good
2025-07-31T04:00:00.000Z	75 \| moderate	21.848 \| fine	95.628 \| fine	32.37 \| good	0.762 \| good	14.078 \| good	0.303 \| good
2025-07-31T05:00:00.000Z	75 \| moderate	22.041 \| fine	96.668 \| fine	29.446 \| good	0.775 \| good	13.897 \| good	0.305 \| good
2025-07-31T06:00:00.000Z	77 \| moderate	22.713 \| fine	100.364 \| fine	24.596 \| good	0.789 \| good	13.716 \| good	0.308 \| good
2025-07-31T07:00:00.000Z	77 \| moderate	23.131 \| fine	101.383 \| fine	23.798 \| good	0.753 \| good	11.231 \| good	0.281 \| good
2025-07-31T08:00:00.000Z	75 \| moderate	21.783 \| fine	95.687 \| fine	21.806 \| good	0.718 \| good	8.747 \| good	0.255 \| good
2025-07-31T09:00:00.000Z	81 \| moderate	25.197 \| fine	109.517 \| fine	20.928 \| good	0.682 \| good	6.262 \| good	0.228 \| good
2025-07-31T10:00:00.000Z	79 \| moderate	24.236 \| fine	105.688 \| fine	21.039 \| good	0.641 \| good	5.674 \| good	0.221 \| good
2025-07-31T11:00:00.000Z	81 \| moderate	24.531 \| fine	107.433 \| fine	21.381 \| good	0.599 \| good	5.086 \| good	0.214 \| good
2025-07-31T12:00:00.000Z	69 \| moderate	19.397 \| fine	85.065 \| fine	20.362 \| good	0.558 \| good	4.498 \| good	0.207 \| good
2025-07-31T13:00:00.000Z	66 \| moderate	17.013 \| fine	75.065 \| fine	20.331 \| good	0.581 \| good	4.052 \| good	0.211 \| good
2025-07-31T14:00:00.000Z	62 \| moderate	14.733 \| fine	66.068 \| fine	27.766 \| good	0.604 \| good	3.606 \| good	0.216 \| good
2025-07-31T15:00:00.000Z	64 \| moderate	15.833 \| fine	70.968 \| fine	28.28 \| good	0.627 \| good	3.16 \| good	0.22 \| good
2025-07-31T16:00:00.000Z	62 \| moderate	14.795 \| fine	65.849 \| fine	25.833 \| good	0.652 \| good	3.089 \| good	0.225 \| good
2025-07-31T17:00:00.000Z	62 \| moderate	15.359 \| fine	69.038 \| fine	25.597 \| good	0.676 \| good	3.018 \| good	0.229 \| good
2025-07-31T18:00:00.000Z	60 \| moderate	14.466 \| fine	64.99 \| fine	25.988 \| good	0.7 \| good	2.947 \| good	0.233 \| good
2025-07-31T19:00:00.000Z	58 \| moderate	13.462 \| fine	61.038 \| fine	23.375 \| good	0.707 \| good	3.495 \| good	0.242 \| good
2025-07-31T20:00:00.000Z	60 \| moderate	14.104 \| fine	63.065 \| fine	21.456 \| good	0.713 \| good	4.043 \| good	0.25 \| good
2025-07-31T21:00:00.000Z	60 \| moderate	13.524 \| fine	60.952 \| fine	23.202 \| good	0.72 \| good	4.591 \| good	0.258 \| good
2025-07-31T22:00:00.000Z	56 \| moderate	12.409 \| fine	56.129 \| fine	22.919 \| good	0.702 \| good	5.115 \| good	0.264 \| good
2025-07-31T23:00:00.000Z	49 \| good	9.268 \| good	41.393 \| good	19.983 \| good	0.684 \| good	5.64 \| good	0.271 \| good
2025-08-01T00:00:00.000Z	69 \| moderate	18.955 \| fine	19.589 \| good	37.83 \| good	0.66 \| good	6.164 \| good	0.277 \| good

Chelmsford

Empower business decisions with accurate air quality data

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

0.23ppm

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

Air quality levels in US

Check live rankings of places in the USA affected by air pollution.

View Polluted Cities

Check live rankings of places in the USA with the cleanest air.

View Clean Cities

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 04:00:00, 2025-07-29.

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

The best air quality in Chelmsford, Massachusetts was observed at 11:00:00 on 2025-07-29.

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

The air quality in Chelmsford, Massachusetts right now is Good, with an AQI of 49.

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 9.382 μg/m³.

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

Chelmsford, Massachusetts currently has a PM₁₀ concentration of 35.915 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 1.036 ppb.

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

Chelmsford, Massachusetts currently has an ozone (O₃) concentration of 45.693 ppm.

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

The current level of nitrogen dioxide (NO₂) in Chelmsford, Massachusetts is 3.403 ppb.

Certified

APIs

Refund Policy

Historical Climate Data

Terms & Conditions

Refund Policy

Terms & Conditions

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-07-29T08:00:00.000Z	58 \| moderate	12.742 \| fine	49.183 \| good	13.459 \| good	0.348 \| good	17.752 \| good	0.224 \| good
2025-07-29T09:00:00.000Z	60 \| moderate	13.671 \| fine	55.985 \| fine	18.274 \| good	0.3 \| good	11.768 \| good	0.227 \| good
2025-07-29T10:00:00.000Z	60 \| moderate	13.907 \| fine	61.512 \| fine	12.974 \| good	0.36 \| good	8.724 \| good	0.227 \| good
2025-07-29T11:00:00.000Z	60 \| moderate	14.396 \| fine	61.8 \| fine	12.65 \| good	0.277 \| good	9.083 \| good	0.248 \| good
2025-07-29T12:00:00.000Z	60 \| moderate	14.448 \| fine	62.767 \| fine	19.548 \| good	0.269 \| good	11.706 \| good	0.294 \| good
2025-07-29T13:00:00.000Z	62 \| moderate	14.637 \| fine	60.05 \| fine	21.214 \| good	1.295 \| good	11.569 \| good	0.261 \| good
2025-07-29T14:00:00.000Z	62 \| moderate	14.595 \| fine	63.219 \| fine	25.874 \| good	0.78 \| good	9.766 \| good	0.298 \| good
2025-07-29T15:00:00.000Z	62 \| moderate	14.505 \| fine	61.192 \| fine	31.509 \| good	2.804 \| good	6.898 \| good	0.27 \| good
2025-07-29T16:00:00.000Z	62 \| moderate	14.561 \| fine	57.796 \| fine	35.087 \| good	1.183 \| good	6.828 \| good	0.243 \| good
2025-07-29T17:00:00.000Z	60 \| moderate	13.746 \| fine	59.237 \| fine	37.531 \| good	1.056 \| good	8.361 \| good	0.243 \| good
2025-07-29T18:00:00.000Z	58 \| moderate	12.984 \| fine	57.408 \| fine	44.071 \| good	1.888 \| good	7.35 \| good	0.227 \| good
2025-07-29T19:00:00.000Z	56 \| moderate	12.124 \| fine	52.117 \| good	46.799 \| good	1.824 \| good	9.002 \| good	0.216 \| good
2025-07-29T20:00:00.000Z	54 \| moderate	11.118 \| good	48.311 \| good	46.957 \| good	1.234 \| good	6.485 \| good	0.255 \| good
2025-07-29T21:00:00.000Z	52 \| moderate	10.387 \| good	43.723 \| good	48.354 \| good	0.953 \| good	4.805 \| good	0.243 \| good
2025-07-29T22:00:00.000Z	52 \| moderate	9.615 \| good	41.795 \| good	46.609 \| good	1.792 \| good	4.789 \| good	0.234 \| good
2025-07-29T23:00:00.000Z	49 \| good	8.932 \| good	36.883 \| good	46.71 \| good	0.987 \| good	3.781 \| good	0.234 \| good
2025-07-30T00:00:00.000Z	44 \| good	8.294 \| good	34.586 \| good	43.216 \| good	0.955 \| good	3.057 \| good	0.222 \| good
2025-07-30T01:00:00.000Z	44 \| good	8.207 \| good	32.663 \| good	38.705 \| good	0.53 \| good	3.2 \| good	0.185 \| good
2025-07-30T02:00:00.000Z	44 \| good	8.174 \| good	35.531 \| good	32.977 \| good	0.351 \| good	4.9 \| good	0.186 \| good
2025-07-30T03:00:00.000Z	71 \| moderate	20.38 \| fine	89.641 \| fine	21.108 \| good	0.764 \| good	12.139 \| good	0.273 \| good
2025-07-30T04:00:00.000Z	49 \| good	8.698 \| good	35.985 \| good	25.388 \| good	0.374 \| good	17.097 \| good	0.273 \| good
2025-07-30T05:00:00.000Z	44 \| good	8.45 \| good	34.263 \| good	27.881 \| good	0.419 \| good	16.387 \| good	0.319 \| good
2025-07-30T06:00:00.000Z	49 \| good	8.524 \| good	33.29 \| good	26.348 \| good	0.338 \| good	16.189 \| good	0.281 \| good
2025-07-30T07:00:00.000Z	44 \| good	8.075 \| good	46.226 \| good	17.701 \| good	0.467 \| good	13.032 \| good	0.321 \| good
2025-07-30T08:00:00.000Z	49 \| good	9.075 \| good	39.83 \| good	20.004 \| good	0.516 \| good	13.496 \| good	0.303 \| good
2025-07-30T09:00:00.000Z	49 \| good	9.04 \| good	45.138 \| good	13.709 \| good	0.513 \| good	14.374 \| good	0.256 \| good
2025-07-30T10:00:00.000Z	49 \| good	8.974 \| good	36.576 \| good	12.946 \| good	0.412 \| good	13.107 \| good	0.256 \| good
2025-07-30T11:00:00.000Z	49 \| good	9.091 \| good	40.315 \| good	13.641 \| good	0.526 \| good	11.567 \| good	0.269 \| good
2025-07-30T12:00:00.000Z	49 \| good	8.994 \| good	41.241 \| good	13.721 \| good	0.597 \| good	9.837 \| good	0.324 \| good
2025-07-30T13:00:00.000Z	49 \| good	9.189 \| good	40.693 \| good	18.846 \| good	0.703 \| good	9.272 \| good	0.33 \| good
2025-07-30T14:00:00.000Z	49 \| good	9.217 \| good	37.429 \| good	26.684 \| good	1.041 \| good	10.279 \| good	0.296 \| good
2025-07-30T15:00:00.000Z	49 \| good	9.339 \| good	41.156 \| good	30.935 \| good	1.542 \| good	12.461 \| good	0.281 \| good
2025-07-30T16:00:00.000Z	52 \| moderate	9.802 \| good	40.881 \| good	34.057 \| good	1.264 \| good	7.163 \| good	0.271 \| good
2025-07-30T17:00:00.000Z	52 \| moderate	9.592 \| good	42.471 \| good	39.93 \| good	1.189 \| good	6.586 \| good	0.281 \| good
2025-07-30T18:00:00.000Z	52 \| moderate	9.524 \| good	41.719 \| good	40.655 \| good	0.601 \| good	7.014 \| good	0.268 \| good
2025-07-30T19:00:00.000Z	49 \| good	9.433 \| good	40.512 \| good	41.974 \| good	0.541 \| good	6.272 \| good	0.268 \| good
2025-07-30T20:00:00.000Z	49 \| good	9.354 \| good	37.216 \| good	43.403 \| good	0.456 \| good	10.901 \| good	0.268 \| good
2025-07-30T21:00:00.000Z	49 \| good	9.316 \| good	41.175 \| good	44.054 \| good	0.479 \| good	11.164 \| good	0.264 \| good
2025-07-30T22:00:00.000Z	49 \| good	8.978 \| good	38.255 \| good	40.276 \| good	0.435 \| good	9.656 \| good	0.298 \| good
2025-07-30T23:00:00.000Z	44 \| good	8.272 \| good	34.831 \| good	39.587 \| good	0.57 \| good	10.576 \| good	0.239 \| good
2025-07-31T00:00:00.000Z	44 \| good	8.257 \| good	35.811 \| good	41.966 \| good	0.335 \| good	11.277 \| good	0.239 \| good
2025-07-31T01:00:00.000Z	44 \| good	7.71 \| good	33.345 \| good	38.303 \| good	0.324 \| good	13.482 \| good	0.282 \| good
2025-07-31T02:00:00.000Z	38 \| good	7.295 \| good	31.169 \| good	37.227 \| good	0.309 \| good	6.731 \| good	0.261 \| good
2025-07-31T03:00:00.000Z	38 \| good	7.177 \| good	30.545 \| good	33.712 \| good	0.422 \| good	5.413 \| good	0.239 \| good
2025-07-31T04:00:00.000Z	38 \| good	7.442 \| good	31.767 \| good	31.261 \| good	0.383 \| good	5.705 \| good	0.241 \| good
2025-07-31T05:00:00.000Z	38 \| good	7.111 \| good	30.765 \| good	35.467 \| good	0.487 \| good	10.085 \| good	0.286 \| good
2025-07-31T06:00:00.000Z	52 \| moderate	10.45 \| good	45.799 \| good	31.356 \| good	0.983 \| good	8.434 \| good	0.333 \| good
2025-07-31T07:00:00.000Z	56 \| moderate	11.76 \| good	39.499 \| good	23.446 \| good	0.686 \| good	9.966 \| good	0.227 \| good
2025-07-31T07:00:00.000Z	54 \| moderate	10.737 \| good	35.562 \| good	24.923 \| good	0.706 \| good	9.812 \| good	0.235 \| good
2025-07-30T01:00:00.000Z	66 \| moderate	16.841 \| fine	74.305 \| fine	23.289 \| good	0.531 \| good	7.989 \| good	0.231 \| good
2025-07-30T02:00:00.000Z	79 \| moderate	23.778 \| fine	103.851 \| fine	24.611 \| good	0.545 \| good	8.683 \| good	0.241 \| good
2025-07-30T03:00:00.000Z	88 \| moderate	28.947 \| fine	125.196 \| fine	26.284 \| good	0.559 \| good	9.378 \| good	0.251 \| good
2025-07-30T04:00:00.000Z	92 \| moderate	30.824 \| fine	133.826 \| fine	26.03 \| good	0.547 \| good	8.764 \| good	0.251 \| good
2025-07-30T05:00:00.000Z	94 \| moderate	31.837 \| fine	137.918 \| fine	20.963 \| good	0.536 \| good	8.151 \| good	0.251 \| good
2025-07-30T06:00:00.000Z	96 \| moderate	32.647 \| fine	141.607 \| fine	17.171 \| good	0.524 \| good	7.537 \| good	0.251 \| good
2025-07-30T07:00:00.000Z	94 \| moderate	31.851 \| fine	137.783 \| fine	17.316 \| good	0.544 \| good	7.699 \| good	0.257 \| good
2025-07-30T08:00:00.000Z	88 \| moderate	29.22 \| fine	126.693 \| fine	17.855 \| good	0.563 \| good	7.86 \| good	0.262 \| good
2025-07-30T09:00:00.000Z	92 \| moderate	31.087 \| fine	134.709 \| fine	17.158 \| good	0.582 \| good	8.022 \| good	0.268 \| good
2025-07-30T10:00:00.000Z	84 \| moderate	27.285 \| fine	118.929 \| fine	16.317 \| good	0.685 \| good	7.613 \| good	0.28 \| good
2025-07-30T11:00:00.000Z	73 \| moderate	21.457 \| fine	94.841 \| fine	21.176 \| good	0.789 \| good	7.205 \| good	0.292 \| good
2025-07-30T12:00:00.000Z	71 \| moderate	20.313 \| fine	89.641 \| fine	28.093 \| good	0.893 \| good	6.797 \| good	0.304 \| good
2025-07-30T13:00:00.000Z	77 \| moderate	23.456 \| fine	102.607 \| fine	32.329 \| good	0.953 \| good	5.507 \| good	0.284 \| good
2025-07-30T14:00:00.000Z	82 \| moderate	25.922 \| fine	112.761 \| fine	40.924 \| good	1.012 \| good	4.217 \| good	0.264 \| good
2025-07-30T15:00:00.000Z	84 \| moderate	27.13 \| fine	117.938 \| fine	48.56 \| good	1.072 \| good	2.927 \| good	0.245 \| good
2025-07-30T16:00:00.000Z	81 \| moderate	25.095 \| fine	109.262 \| fine	49.312 \| good	0.897 \| good	2.411 \| good	0.232 \| good
2025-07-30T17:00:00.000Z	75 \| moderate	21.507 \| fine	94.351 \| fine	48 \| good	0.722 \| good	1.895 \| good	0.219 \| good
2025-07-30T18:00:00.000Z	69 \| moderate	18.925 \| fine	83.592 \| fine	49.223 \| good	0.547 \| good	1.38 \| good	0.205 \| good
2025-07-30T19:00:00.000Z	69 \| moderate	18.655 \| fine	82.542 \| fine	51.732 \| good	0.472 \| good	1.425 \| good	0.196 \| good
2025-07-30T20:00:00.000Z	64 \| moderate	16.168 \| fine	71.644 \| fine	48.058 \| good	0.398 \| good	1.47 \| good	0.187 \| good
2025-07-30T21:00:00.000Z	62 \| moderate	15.056 \| fine	67.122 \| fine	49.328 \| good	0.323 \| good	1.515 \| good	0.178 \| good
2025-07-30T22:00:00.000Z	60 \| moderate	14.243 \| fine	64.293 \| fine	48.945 \| good	0.379 \| good	3.445 \| good	0.194 \| good
2025-07-30T23:00:00.000Z	60 \| moderate	14.085 \| fine	63.193 \| fine	44.787 \| good	0.434 \| good	5.375 \| good	0.21 \| good
2025-07-31T00:00:00.000Z	71 \| moderate	19.59 \| fine	86.919 \| fine	40.202 \| good	0.49 \| good	7.305 \| good	0.225 \| good
2025-07-31T01:00:00.000Z	69 \| moderate	19.455 \| fine	85.854 \| fine	36.576 \| good	0.576 \| good	9.623 \| good	0.25 \| good
2025-07-31T02:00:00.000Z	73 \| moderate	21.435 \| fine	93.757 \| fine	31.464 \| good	0.662 \| good	11.941 \| good	0.275 \| good
2025-07-31T03:00:00.000Z	77 \| moderate	23.337 \| fine	102.473 \| fine	31.95 \| good	0.748 \| good	14.258 \| good	0.3 \| good
2025-07-31T04:00:00.000Z	75 \| moderate	21.848 \| fine	95.628 \| fine	32.37 \| good	0.762 \| good	14.078 \| good	0.303 \| good
2025-07-31T05:00:00.000Z	75 \| moderate	22.041 \| fine	96.668 \| fine	29.446 \| good	0.775 \| good	13.897 \| good	0.305 \| good
2025-07-31T06:00:00.000Z	77 \| moderate	22.713 \| fine	100.364 \| fine	24.596 \| good	0.789 \| good	13.716 \| good	0.308 \| good
2025-07-31T07:00:00.000Z	77 \| moderate	23.131 \| fine	101.383 \| fine	23.798 \| good	0.753 \| good	11.231 \| good	0.281 \| good
2025-07-31T08:00:00.000Z	75 \| moderate	21.783 \| fine	95.687 \| fine	21.806 \| good	0.718 \| good	8.747 \| good	0.255 \| good
2025-07-31T09:00:00.000Z	81 \| moderate	25.197 \| fine	109.517 \| fine	20.928 \| good	0.682 \| good	6.262 \| good	0.228 \| good
2025-07-31T10:00:00.000Z	79 \| moderate	24.236 \| fine	105.688 \| fine	21.039 \| good	0.641 \| good	5.674 \| good	0.221 \| good
2025-07-31T11:00:00.000Z	81 \| moderate	24.531 \| fine	107.433 \| fine	21.381 \| good	0.599 \| good	5.086 \| good	0.214 \| good
2025-07-31T12:00:00.000Z	69 \| moderate	19.397 \| fine	85.065 \| fine	20.362 \| good	0.558 \| good	4.498 \| good	0.207 \| good
2025-07-31T13:00:00.000Z	66 \| moderate	17.013 \| fine	75.065 \| fine	20.331 \| good	0.581 \| good	4.052 \| good	0.211 \| good
2025-07-31T14:00:00.000Z	62 \| moderate	14.733 \| fine	66.068 \| fine	27.766 \| good	0.604 \| good	3.606 \| good	0.216 \| good
2025-07-31T15:00:00.000Z	64 \| moderate	15.833 \| fine	70.968 \| fine	28.28 \| good	0.627 \| good	3.16 \| good	0.22 \| good
2025-07-31T16:00:00.000Z	62 \| moderate	14.795 \| fine	65.849 \| fine	25.833 \| good	0.652 \| good	3.089 \| good	0.225 \| good
2025-07-31T17:00:00.000Z	62 \| moderate	15.359 \| fine	69.038 \| fine	25.597 \| good	0.676 \| good	3.018 \| good	0.229 \| good
2025-07-31T18:00:00.000Z	60 \| moderate	14.466 \| fine	64.99 \| fine	25.988 \| good	0.7 \| good	2.947 \| good	0.233 \| good
2025-07-31T19:00:00.000Z	58 \| moderate	13.462 \| fine	61.038 \| fine	23.375 \| good	0.707 \| good	3.495 \| good	0.242 \| good
2025-07-31T20:00:00.000Z	60 \| moderate	14.104 \| fine	63.065 \| fine	21.456 \| good	0.713 \| good	4.043 \| good	0.25 \| good
2025-07-31T21:00:00.000Z	60 \| moderate	13.524 \| fine	60.952 \| fine	23.202 \| good	0.72 \| good	4.591 \| good	0.258 \| good
2025-07-31T22:00:00.000Z	56 \| moderate	12.409 \| fine	56.129 \| fine	22.919 \| good	0.702 \| good	5.115 \| good	0.264 \| good
2025-07-31T23:00:00.000Z	49 \| good	9.268 \| good	41.393 \| good	19.983 \| good	0.684 \| good	5.64 \| good	0.271 \| good
2025-08-01T00:00:00.000Z	69 \| moderate	18.955 \| fine	19.589 \| good	37.83 \| good	0.66 \| good	6.164 \| good	0.277 \| 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?