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

Leominster, Massachusetts currently has a PM10 concentration of 46.852 μg/m3.

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

The current sulfur dioxide (SO2) concentration in Leominster, Massachusetts is 0.389 ppb.

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

Leominster, Massachusetts currently has an ozone (O3) concentration of 19.216 ppm.

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

The current level of nitrogen dioxide (NO2) in Leominster, Massachusetts is 4.029 ppb.

Current air quality index in Leominster, Massachusetts today

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

Leominster, Massachusetts currently has a PM2.5 concentration of 12.805 μg/m3.

Stay updated with real-time air quality in Leominster, 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

Leominster, Massachusetts

Last updated: ... (Local time)

Common air pollutants in Leominster, Massachusetts

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

12.80 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

46.85 μg/m³

155

255

425

605+

Ozone (O₃)

19.22 ppb

201

201+

Sulfur Dioxide (SO₂)

0.39 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

4.03 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.17 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Leominster, Massachusetts

Get Live Pollen Counts

Leominster, Massachusetts

Scroll To Air Quality Map

Track live Leominster, Massachusetts air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-07-09T10:00:00.000Z	49 \| good	8.656 \| good	30.132 \| good	28.868 \| good	0.427 \| good	10.841 \| good	0.23 \| good
2026-07-09T11:00:00.000Z	38 \| good	7.313 \| good	31.831 \| good	26.892 \| good	0.472 \| good	9.81 \| good	0.23 \| good
2026-07-09T12:00:00.000Z	44 \| good	8.371 \| good	19.987 \| good	26.504 \| good	0.503 \| good	6.108 \| good	0.219 \| good
2026-07-09T13:00:00.000Z	49 \| good	9.253 \| good	32.8 \| good	20.551 \| good	0.503 \| good	6.069 \| good	0.219 \| good
2026-07-09T14:00:00.000Z	33 \| good	5.514 \| good	17.39 \| good	31.231 \| good	0.365 \| good	3.672 \| good	0.186 \| good
2026-07-09T15:00:00.000Z	33 \| good	6.428 \| good	20.438 \| good	27.68 \| good	0.35 \| good	3.49 \| good	0.156 \| good
2026-07-09T16:00:00.000Z	33 \| good	6.141 \| good	19.085 \| good	33.243 \| good	0.349 \| good	3.26 \| good	0.156 \| good
2026-07-09T17:00:00.000Z	34 \| good	4.714 \| good	14.915 \| good	36.982 \| good	0.503 \| good	3.129 \| good	0.156 \| good
2026-07-09T18:00:00.000Z	37 \| good	5.071 \| good	18.759 \| good	40.042 \| good	0.522 \| good	4.473 \| good	0.168 \| good
2026-07-09T19:00:00.000Z	41 \| good	4.311 \| good	17.596 \| good	43.563 \| good	0.522 \| good	3.406 \| good	0.156 \| good
2026-07-09T20:00:00.000Z	39 \| good	4.303 \| good	18.98 \| good	41.678 \| good	0.413 \| good	4.292 \| good	0.255 \| good
2026-07-09T21:00:00.000Z	42 \| good	5.032 \| good	20.069 \| good	45.324 \| good	0.47 \| good	4.153 \| good	0.189 \| good
2026-07-09T22:00:00.000Z	64 \| moderate	4.941 \| good	18.972 \| good	58.553 \| fine	0.411 \| good	5.384 \| good	0.201 \| good
2026-07-09T23:00:00.000Z	61 \| moderate	7.043 \| good	26.187 \| good	58.004 \| fine	0.426 \| good	6.548 \| good	0.238 \| good
2026-07-10T00:00:00.000Z	47 \| good	7.898 \| good	27.7 \| good	50.505 \| good	0.412 \| good	6.227 \| good	0.256 \| good
2026-07-10T01:00:00.000Z	58 \| moderate	8.399 \| good	30.965 \| good	57.195 \| fine	0.412 \| good	5.881 \| good	0.219 \| good
2026-07-10T02:00:00.000Z	58 \| moderate	8.215 \| good	26.973 \| good	56.639 \| fine	0.432 \| good	3.636 \| good	0.212 \| good
2026-07-10T03:00:00.000Z	44 \| good	8.376 \| good	26.612 \| good	44.016 \| good	0.397 \| good	4.64 \| good	0.237 \| good
2026-07-10T04:00:00.000Z	45 \| good	7.037 \| good	28.269 \| good	48.977 \| good	0.382 \| good	4.412 \| good	0.237 \| good
2026-07-10T05:00:00.000Z	38 \| good	7.312 \| good	29.012 \| good	41.43 \| good	0.367 \| good	4.766 \| good	0.2 \| good
2026-07-10T06:00:00.000Z	38 \| good	6.77 \| good	24.828 \| good	37.746 \| good	0.364 \| good	3.662 \| good	0.2 \| good
2026-07-10T07:00:00.000Z	38 \| good	6.553 \| good	18.293 \| good	37.649 \| good	0.352 \| good	3.702 \| good	0.2 \| good
2026-07-10T08:00:00.000Z	33 \| good	6.291 \| good	23.465 \| good	33.813 \| good	0.397 \| good	4.356 \| good	0.186 \| good
2026-07-10T09:00:00.000Z	28 \| good	4.735 \| good	17.163 \| good	29.805 \| good	0.364 \| good	7.048 \| good	0.196 \| good
2026-07-10T10:00:00.000Z	33 \| good	6.24 \| good	22.861 \| good	30.772 \| good	0.414 \| good	5.881 \| good	0.255 \| good
2026-07-10T11:00:00.000Z	33 \| good	5.525 \| good	20.15 \| good	28.17 \| good	0.379 \| good	4.75 \| good	0.266 \| good
2026-07-10T12:00:00.000Z	33 \| good	5.774 \| good	18.439 \| good	23.745 \| good	0.376 \| good	3.104 \| good	0.255 \| good
2026-07-10T13:00:00.000Z	27 \| good	5.341 \| good	21.642 \| good	28.257 \| good	0.377 \| good	3.298 \| good	0.255 \| good
2026-07-10T14:00:00.000Z	38 \| good	7.292 \| good	30.307 \| good	27.582 \| good	0.712 \| good	2.366 \| good	0.244 \| good
2026-07-10T15:00:00.000Z	33 \| good	5.788 \| good	16.34 \| good	32.383 \| good	0.468 \| good	2.56 \| good	0.222 \| good
2026-07-10T16:00:00.000Z	31 \| good	5.293 \| good	18.888 \| good	34.221 \| good	0.489 \| good	4.099 \| good	0.222 \| good
2026-07-10T17:00:00.000Z	33 \| good	4.256 \| good	15.418 \| good	35.609 \| good	0.468 \| good	3.086 \| good	0.217 \| good
2026-07-10T18:00:00.000Z	34 \| good	4.55 \| good	20.866 \| good	36.851 \| good	0.56 \| good	2.735 \| good	0.203 \| good
2026-07-10T19:00:00.000Z	34 \| good	3.824 \| good	12.322 \| good	37.45 \| good	0.591 \| good	2.937 \| good	0.203 \| good
2026-07-10T20:00:00.000Z	31 \| good	3.644 \| good	10.733 \| good	33.444 \| good	0.441 \| good	2.564 \| good	0.216 \| good
2026-07-10T21:00:00.000Z	33 \| good	4.883 \| good	27.492 \| good	36.153 \| good	0.418 \| good	1.702 \| good	0.216 \| good
2026-07-10T22:00:00.000Z	33 \| good	5.696 \| good	24.167 \| good	34.751 \| good	0.398 \| good	1.395 \| good	0.217 \| good
2026-07-10T23:00:00.000Z	34 \| good	4.735 \| good	37.084 \| good	35.547 \| good	0.413 \| good	2.194 \| good	0.205 \| good
2026-07-11T00:00:00.000Z	33 \| good	4.052 \| good	13.435 \| good	36.206 \| good	0.443 \| good	2.63 \| good	0.191 \| good
2026-07-11T01:00:00.000Z	29 \| good	5.376 \| good	28.954 \| good	31.474 \| good	0.48 \| good	2.649 \| good	0.214 \| good
2026-07-11T02:00:00.000Z	33 \| good	6.338 \| good	27.588 \| good	29.908 \| good	0.419 \| good	4.773 \| good	0.266 \| good
2026-07-11T03:00:00.000Z	64 \| moderate	16.338 \| fine	72.554 \| fine	22.371 \| good	0.242 \| good	9.359 \| good	0.255 \| good
2026-07-11T04:00:00.000Z	44 \| good	8.126 \| good	27.109 \| good	24.744 \| good	0.418 \| good	4.238 \| good	0.319 \| good
2026-07-11T05:00:00.000Z	49 \| good	9.234 \| good	30.944 \| good	21.831 \| good	0.471 \| good	3.338 \| good	0.219 \| good
2026-07-11T06:00:00.000Z	52 \| moderate	10.418 \| good	22.228 \| good	19.857 \| good	0.374 \| good	3.436 \| good	0.207 \| good
2026-07-11T07:00:00.000Z	54 \| moderate	10.986 \| good	42.68 \| good	17.263 \| good	0.374 \| good	3.841 \| good	0.207 \| good
2026-07-11T08:00:00.000Z	58 \| moderate	12.805 \| fine	46.852 \| good	19.216 \| good	0.389 \| good	4.029 \| good	0.174 \| good
2026-07-11T09:00:00.000Z	58 \| moderate	12.805 \| fine	46.852 \| good	19.216 \| good	0.389 \| good	4.029 \| good	0.174 \| good
2026-07-11T10:00:00.000Z	33 \| good	6.123 \| good	26.755 \| good	15.435 \| good	0.25 \| good	3.51 \| good	0.167 \| good
2026-07-11T11:00:00.000Z	38 \| good	6.518 \| good	28.881 \| good	17.353 \| good	0.255 \| good	3.276 \| good	0.17 \| good
2026-07-11T12:00:00.000Z	44 \| good	8.021 \| good	35.08 \| good	23.477 \| good	0.291 \| good	2.541 \| good	0.171 \| good
2026-07-11T13:00:00.000Z	49 \| good	9.437 \| good	41.882 \| good	29.328 \| good	0.352 \| good	1.599 \| good	0.16 \| good
2026-07-11T14:00:00.000Z	44 \| good	8.306 \| good	36.487 \| good	32.24 \| good	0.336 \| good	0.959 \| good	0.147 \| good
2026-07-11T15:00:00.000Z	38 \| good	6.533 \| good	28.838 \| good	32.343 \| good	0.317 \| good	0.686 \| good	0.142 \| good
2026-07-11T16:00:00.000Z	29 \| good	4.543 \| good	19.872 \| good	30.966 \| good	0.307 \| good	0.559 \| good	0.141 \| good
2026-07-11T17:00:00.000Z	27 \| good	4.359 \| good	18.931 \| good	28.977 \| good	0.302 \| good	0.508 \| good	0.141 \| good
2026-07-11T18:00:00.000Z	27 \| good	5.497 \| good	23.665 \| good	27.503 \| good	0.298 \| good	0.491 \| good	0.141 \| good
2026-07-11T19:00:00.000Z	33 \| good	6.107 \| good	27.107 \| good	27.605 \| good	0.288 \| good	0.499 \| good	0.141 \| good
2026-07-11T20:00:00.000Z	33 \| good	6.435 \| good	28.666 \| good	29.645 \| good	0.277 \| good	0.538 \| good	0.141 \| good
2026-07-11T21:00:00.000Z	38 \| good	7.321 \| good	32.306 \| good	32.514 \| good	0.263 \| good	0.638 \| good	0.141 \| good
2026-07-11T22:00:00.000Z	54 \| moderate	11.002 \| good	48.643 \| good	33.491 \| good	0.241 \| good	1.277 \| good	0.148 \| good
2026-07-11T23:00:00.000Z	66 \| moderate	16.839 \| fine	74.585 \| fine	37.568 \| good	0.221 \| good	2.447 \| good	0.162 \| good
2026-07-12T00:00:00.000Z	71 \| moderate	19.983 \| fine	87.768 \| fine	36.381 \| good	0.211 \| good	4.695 \| good	0.186 \| good
2026-07-12T01:00:00.000Z	75 \| moderate	21.585 \| fine	94.928 \| fine	34.137 \| good	0.23 \| good	7.122 \| good	0.201 \| good
2026-07-12T02:00:00.000Z	75 \| moderate	21.583 \| fine	94.814 \| fine	32.439 \| good	0.235 \| good	8.009 \| good	0.203 \| good
2026-07-12T03:00:00.000Z	73 \| moderate	21.228 \| fine	93.243 \| fine	30.007 \| good	0.225 \| good	7.582 \| good	0.194 \| good
2026-07-12T04:00:00.000Z	73 \| moderate	20.523 \| fine	90.534 \| fine	26.261 \| good	0.203 \| good	6.476 \| good	0.181 \| good
2026-07-12T05:00:00.000Z	71 \| moderate	20.065 \| fine	88.311 \| fine	20.713 \| good	0.175 \| good	4.739 \| good	0.165 \| good
2026-07-12T06:00:00.000Z	67 \| moderate	18.213 \| fine	80.595 \| fine	16.858 \| good	0.157 \| good	3.226 \| good	0.15 \| good
2026-07-12T07:00:00.000Z	58 \| moderate	13.314 \| fine	59.463 \| fine	16.446 \| good	0.149 \| good	2.489 \| good	0.142 \| good
2026-07-12T08:00:00.000Z	44 \| good	8.436 \| good	37.31 \| good	15.751 \| good	0.148 \| good	2.269 \| good	0.138 \| good
2026-07-12T09:00:00.000Z	33 \| good	6.25 \| good	27.485 \| good	15.9 \| good	0.151 \| good	2.317 \| good	0.138 \| good
2026-07-12T10:00:00.000Z	27 \| good	4.844 \| good	21.039 \| good	16.438 \| good	0.153 \| good	2.333 \| good	0.139 \| good
2026-07-12T11:00:00.000Z	27 \| good	5.426 \| good	23.291 \| good	19.031 \| good	0.15 \| good	2.107 \| good	0.143 \| good
2026-07-12T12:00:00.000Z	38 \| good	6.81 \| good	29.999 \| good	24.037 \| good	0.162 \| good	1.414 \| good	0.142 \| good
2026-07-12T13:00:00.000Z	33 \| good	6.386 \| good	28.37 \| good	27.683 \| good	0.18 \| good	0.906 \| good	0.137 \| good
2026-07-12T14:00:00.000Z	33 \| good	6.153 \| good	27.313 \| good	30.388 \| good	0.175 \| good	0.661 \| good	0.137 \| good
2026-07-12T15:00:00.000Z	33 \| good	6.119 \| good	27.103 \| good	32.224 \| good	0.159 \| good	0.502 \| good	0.136 \| good
2026-07-12T16:00:00.000Z	33 \| good	5.587 \| good	23.926 \| good	32.143 \| good	0.148 \| good	0.421 \| good	0.137 \| good
2026-07-12T17:00:00.000Z	29 \| good	5.294 \| good	22.741 \| good	31.131 \| good	0.143 \| good	0.393 \| good	0.138 \| good
2026-07-12T18:00:00.000Z	33 \| good	5.513 \| good	23.74 \| good	31.398 \| good	0.139 \| good	0.405 \| good	0.139 \| good
2026-07-12T19:00:00.000Z	29 \| good	5.009 \| good	21.688 \| good	31.308 \| good	0.137 \| good	0.439 \| good	0.141 \| good
2026-07-12T20:00:00.000Z	30 \| good	5.058 \| good	21.688 \| good	31.952 \| good	0.14 \| good	0.517 \| good	0.143 \| good
2026-07-12T21:00:00.000Z	38 \| good	6.727 \| good	29.895 \| good	34.362 \| good	0.143 \| good	0.657 \| good	0.147 \| good
2026-07-12T22:00:00.000Z	49 \| good	9.412 \| good	42.01 \| good	42.262 \| good	0.148 \| good	0.971 \| good	0.153 \| good
2026-07-12T23:00:00.000Z	54 \| moderate	10.615 \| good	47.143 \| good	39.749 \| good	0.156 \| good	1.85 \| good	0.167 \| good
2026-07-13T00:00:00.000Z	58 \| moderate	12.561 \| fine	56.661 \| fine	32.266 \| good	0.172 \| good	2.941 \| good	0.179 \| good
2026-07-13T01:00:00.000Z	58 \| moderate	12.502 \| fine	56.352 \| fine	28.209 \| good	0.191 \| good	4.229 \| good	0.191 \| good
2026-07-13T02:00:00.000Z	56 \| moderate	12.409 \| fine	55.973 \| fine	27.555 \| good	0.195 \| good	4.534 \| good	0.191 \| good
2026-07-13T03:00:00.000Z	52 \| moderate	9.833 \| good	43.88 \| good	28.644 \| good	0.192 \| good	4.499 \| good	0.188 \| good
2026-07-13T04:00:00.000Z	38 \| good	7.135 \| good	31.613 \| good	27.067 \| good	0.182 \| good	4.177 \| good	0.182 \| good
2026-07-13T05:00:00.000Z	33 \| good	5.953 \| good	25.94 \| good	24.697 \| good	0.173 \| good	3.683 \| good	0.175 \| good
2026-07-13T06:00:00.000Z	38 \| good	7.316 \| good	8.062 \| good	35.616 \| good	0.175 \| good	3.339 \| good	0.169 \| good
2026-07-13T07:00:00.000Z	27 \| good	4.841 \| good	20.879 \| good	23.581 \| good	0.192 \| good	3.277 \| good	0.165 \| good
2026-07-13T08:00:00.000Z	27 \| good	4.974 \| good	21.158 \| good	23.356 \| good	0.229 \| good	3.442 \| good	0.164 \| good
2026-07-13T09:00:00.000Z	33 \| good	6.494 \| good	29.043 \| good	21.898 \| good	0.284 \| good	3.672 \| good	0.163 \| good

Leominster

Empower business decisions with accurate air quality data

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

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How accurate is Massachusetts, USA air quality data?

The air quality data for Massachusetts, USA is gathered from reliable sources such as satellites and monitoring stations, adhering to US EPA guidelines. With the help of advanced algorithms and machine learning, factors like traffic and population density are analyzed to deliver accurate and dependable results.

Source: Ambee Data Sources

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Frequently asked questions

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

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

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

Leominster, Massachusetts experienced its worst air quality at 03:00:00, 2026-07-11.

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

The best air quality in Leominster, Massachusetts was observed at 01:00:00 on 2026-07-10.

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

The air quality in Leominster, Massachusetts right now is Moderate, with an AQI of 58.

What pollutant is most frequently found in Leominster, Massachusetts?

In Leominster, Massachusetts, PM2.5 is the most frequently found pollutant.

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

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

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

Leominster, Massachusetts currently has a PM_2.5 concentration of 12.805 μg/m³.

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

Leominster, Massachusetts currently has a PM₁₀ concentration of 46.852 μg/m³.

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

The current carbon monoxide (CO) level in Leominster, Massachusetts is 0.174 ppm.

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

The current sulfur dioxide (SO₂) concentration in Leominster, Massachusetts is 0.389 ppb.

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

Leominster, Massachusetts currently has an ozone (O₃) concentration of 19.216 ppm.

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

The current level of nitrogen dioxide (NO₂) in Leominster, Massachusetts is 4.029 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-07-09T10:00:00.000Z	49 \| good	8.656 \| good	30.132 \| good	28.868 \| good	0.427 \| good	10.841 \| good	0.23 \| good
2026-07-09T11:00:00.000Z	38 \| good	7.313 \| good	31.831 \| good	26.892 \| good	0.472 \| good	9.81 \| good	0.23 \| good
2026-07-09T12:00:00.000Z	44 \| good	8.371 \| good	19.987 \| good	26.504 \| good	0.503 \| good	6.108 \| good	0.219 \| good
2026-07-09T13:00:00.000Z	49 \| good	9.253 \| good	32.8 \| good	20.551 \| good	0.503 \| good	6.069 \| good	0.219 \| good
2026-07-09T14:00:00.000Z	33 \| good	5.514 \| good	17.39 \| good	31.231 \| good	0.365 \| good	3.672 \| good	0.186 \| good
2026-07-09T15:00:00.000Z	33 \| good	6.428 \| good	20.438 \| good	27.68 \| good	0.35 \| good	3.49 \| good	0.156 \| good
2026-07-09T16:00:00.000Z	33 \| good	6.141 \| good	19.085 \| good	33.243 \| good	0.349 \| good	3.26 \| good	0.156 \| good
2026-07-09T17:00:00.000Z	34 \| good	4.714 \| good	14.915 \| good	36.982 \| good	0.503 \| good	3.129 \| good	0.156 \| good
2026-07-09T18:00:00.000Z	37 \| good	5.071 \| good	18.759 \| good	40.042 \| good	0.522 \| good	4.473 \| good	0.168 \| good
2026-07-09T19:00:00.000Z	41 \| good	4.311 \| good	17.596 \| good	43.563 \| good	0.522 \| good	3.406 \| good	0.156 \| good
2026-07-09T20:00:00.000Z	39 \| good	4.303 \| good	18.98 \| good	41.678 \| good	0.413 \| good	4.292 \| good	0.255 \| good
2026-07-09T21:00:00.000Z	42 \| good	5.032 \| good	20.069 \| good	45.324 \| good	0.47 \| good	4.153 \| good	0.189 \| good
2026-07-09T22:00:00.000Z	64 \| moderate	4.941 \| good	18.972 \| good	58.553 \| fine	0.411 \| good	5.384 \| good	0.201 \| good
2026-07-09T23:00:00.000Z	61 \| moderate	7.043 \| good	26.187 \| good	58.004 \| fine	0.426 \| good	6.548 \| good	0.238 \| good
2026-07-10T00:00:00.000Z	47 \| good	7.898 \| good	27.7 \| good	50.505 \| good	0.412 \| good	6.227 \| good	0.256 \| good
2026-07-10T01:00:00.000Z	58 \| moderate	8.399 \| good	30.965 \| good	57.195 \| fine	0.412 \| good	5.881 \| good	0.219 \| good
2026-07-10T02:00:00.000Z	58 \| moderate	8.215 \| good	26.973 \| good	56.639 \| fine	0.432 \| good	3.636 \| good	0.212 \| good
2026-07-10T03:00:00.000Z	44 \| good	8.376 \| good	26.612 \| good	44.016 \| good	0.397 \| good	4.64 \| good	0.237 \| good
2026-07-10T04:00:00.000Z	45 \| good	7.037 \| good	28.269 \| good	48.977 \| good	0.382 \| good	4.412 \| good	0.237 \| good
2026-07-10T05:00:00.000Z	38 \| good	7.312 \| good	29.012 \| good	41.43 \| good	0.367 \| good	4.766 \| good	0.2 \| good
2026-07-10T06:00:00.000Z	38 \| good	6.77 \| good	24.828 \| good	37.746 \| good	0.364 \| good	3.662 \| good	0.2 \| good
2026-07-10T07:00:00.000Z	38 \| good	6.553 \| good	18.293 \| good	37.649 \| good	0.352 \| good	3.702 \| good	0.2 \| good
2026-07-10T08:00:00.000Z	33 \| good	6.291 \| good	23.465 \| good	33.813 \| good	0.397 \| good	4.356 \| good	0.186 \| good
2026-07-10T09:00:00.000Z	28 \| good	4.735 \| good	17.163 \| good	29.805 \| good	0.364 \| good	7.048 \| good	0.196 \| good
2026-07-10T10:00:00.000Z	33 \| good	6.24 \| good	22.861 \| good	30.772 \| good	0.414 \| good	5.881 \| good	0.255 \| good
2026-07-10T11:00:00.000Z	33 \| good	5.525 \| good	20.15 \| good	28.17 \| good	0.379 \| good	4.75 \| good	0.266 \| good
2026-07-10T12:00:00.000Z	33 \| good	5.774 \| good	18.439 \| good	23.745 \| good	0.376 \| good	3.104 \| good	0.255 \| good
2026-07-10T13:00:00.000Z	27 \| good	5.341 \| good	21.642 \| good	28.257 \| good	0.377 \| good	3.298 \| good	0.255 \| good
2026-07-10T14:00:00.000Z	38 \| good	7.292 \| good	30.307 \| good	27.582 \| good	0.712 \| good	2.366 \| good	0.244 \| good
2026-07-10T15:00:00.000Z	33 \| good	5.788 \| good	16.34 \| good	32.383 \| good	0.468 \| good	2.56 \| good	0.222 \| good
2026-07-10T16:00:00.000Z	31 \| good	5.293 \| good	18.888 \| good	34.221 \| good	0.489 \| good	4.099 \| good	0.222 \| good
2026-07-10T17:00:00.000Z	33 \| good	4.256 \| good	15.418 \| good	35.609 \| good	0.468 \| good	3.086 \| good	0.217 \| good
2026-07-10T18:00:00.000Z	34 \| good	4.55 \| good	20.866 \| good	36.851 \| good	0.56 \| good	2.735 \| good	0.203 \| good
2026-07-10T19:00:00.000Z	34 \| good	3.824 \| good	12.322 \| good	37.45 \| good	0.591 \| good	2.937 \| good	0.203 \| good
2026-07-10T20:00:00.000Z	31 \| good	3.644 \| good	10.733 \| good	33.444 \| good	0.441 \| good	2.564 \| good	0.216 \| good
2026-07-10T21:00:00.000Z	33 \| good	4.883 \| good	27.492 \| good	36.153 \| good	0.418 \| good	1.702 \| good	0.216 \| good
2026-07-10T22:00:00.000Z	33 \| good	5.696 \| good	24.167 \| good	34.751 \| good	0.398 \| good	1.395 \| good	0.217 \| good
2026-07-10T23:00:00.000Z	34 \| good	4.735 \| good	37.084 \| good	35.547 \| good	0.413 \| good	2.194 \| good	0.205 \| good
2026-07-11T00:00:00.000Z	33 \| good	4.052 \| good	13.435 \| good	36.206 \| good	0.443 \| good	2.63 \| good	0.191 \| good
2026-07-11T01:00:00.000Z	29 \| good	5.376 \| good	28.954 \| good	31.474 \| good	0.48 \| good	2.649 \| good	0.214 \| good
2026-07-11T02:00:00.000Z	33 \| good	6.338 \| good	27.588 \| good	29.908 \| good	0.419 \| good	4.773 \| good	0.266 \| good
2026-07-11T03:00:00.000Z	64 \| moderate	16.338 \| fine	72.554 \| fine	22.371 \| good	0.242 \| good	9.359 \| good	0.255 \| good
2026-07-11T04:00:00.000Z	44 \| good	8.126 \| good	27.109 \| good	24.744 \| good	0.418 \| good	4.238 \| good	0.319 \| good
2026-07-11T05:00:00.000Z	49 \| good	9.234 \| good	30.944 \| good	21.831 \| good	0.471 \| good	3.338 \| good	0.219 \| good
2026-07-11T06:00:00.000Z	52 \| moderate	10.418 \| good	22.228 \| good	19.857 \| good	0.374 \| good	3.436 \| good	0.207 \| good
2026-07-11T07:00:00.000Z	54 \| moderate	10.986 \| good	42.68 \| good	17.263 \| good	0.374 \| good	3.841 \| good	0.207 \| good
2026-07-11T08:00:00.000Z	58 \| moderate	12.805 \| fine	46.852 \| good	19.216 \| good	0.389 \| good	4.029 \| good	0.174 \| good
2026-07-11T09:00:00.000Z	58 \| moderate	12.805 \| fine	46.852 \| good	19.216 \| good	0.389 \| good	4.029 \| good	0.174 \| good
2026-07-11T10:00:00.000Z	33 \| good	6.123 \| good	26.755 \| good	15.435 \| good	0.25 \| good	3.51 \| good	0.167 \| good
2026-07-11T11:00:00.000Z	38 \| good	6.518 \| good	28.881 \| good	17.353 \| good	0.255 \| good	3.276 \| good	0.17 \| good
2026-07-11T12:00:00.000Z	44 \| good	8.021 \| good	35.08 \| good	23.477 \| good	0.291 \| good	2.541 \| good	0.171 \| good
2026-07-11T13:00:00.000Z	49 \| good	9.437 \| good	41.882 \| good	29.328 \| good	0.352 \| good	1.599 \| good	0.16 \| good
2026-07-11T14:00:00.000Z	44 \| good	8.306 \| good	36.487 \| good	32.24 \| good	0.336 \| good	0.959 \| good	0.147 \| good
2026-07-11T15:00:00.000Z	38 \| good	6.533 \| good	28.838 \| good	32.343 \| good	0.317 \| good	0.686 \| good	0.142 \| good
2026-07-11T16:00:00.000Z	29 \| good	4.543 \| good	19.872 \| good	30.966 \| good	0.307 \| good	0.559 \| good	0.141 \| good
2026-07-11T17:00:00.000Z	27 \| good	4.359 \| good	18.931 \| good	28.977 \| good	0.302 \| good	0.508 \| good	0.141 \| good
2026-07-11T18:00:00.000Z	27 \| good	5.497 \| good	23.665 \| good	27.503 \| good	0.298 \| good	0.491 \| good	0.141 \| good
2026-07-11T19:00:00.000Z	33 \| good	6.107 \| good	27.107 \| good	27.605 \| good	0.288 \| good	0.499 \| good	0.141 \| good
2026-07-11T20:00:00.000Z	33 \| good	6.435 \| good	28.666 \| good	29.645 \| good	0.277 \| good	0.538 \| good	0.141 \| good
2026-07-11T21:00:00.000Z	38 \| good	7.321 \| good	32.306 \| good	32.514 \| good	0.263 \| good	0.638 \| good	0.141 \| good
2026-07-11T22:00:00.000Z	54 \| moderate	11.002 \| good	48.643 \| good	33.491 \| good	0.241 \| good	1.277 \| good	0.148 \| good
2026-07-11T23:00:00.000Z	66 \| moderate	16.839 \| fine	74.585 \| fine	37.568 \| good	0.221 \| good	2.447 \| good	0.162 \| good
2026-07-12T00:00:00.000Z	71 \| moderate	19.983 \| fine	87.768 \| fine	36.381 \| good	0.211 \| good	4.695 \| good	0.186 \| good
2026-07-12T01:00:00.000Z	75 \| moderate	21.585 \| fine	94.928 \| fine	34.137 \| good	0.23 \| good	7.122 \| good	0.201 \| good
2026-07-12T02:00:00.000Z	75 \| moderate	21.583 \| fine	94.814 \| fine	32.439 \| good	0.235 \| good	8.009 \| good	0.203 \| good
2026-07-12T03:00:00.000Z	73 \| moderate	21.228 \| fine	93.243 \| fine	30.007 \| good	0.225 \| good	7.582 \| good	0.194 \| good
2026-07-12T04:00:00.000Z	73 \| moderate	20.523 \| fine	90.534 \| fine	26.261 \| good	0.203 \| good	6.476 \| good	0.181 \| good
2026-07-12T05:00:00.000Z	71 \| moderate	20.065 \| fine	88.311 \| fine	20.713 \| good	0.175 \| good	4.739 \| good	0.165 \| good
2026-07-12T06:00:00.000Z	67 \| moderate	18.213 \| fine	80.595 \| fine	16.858 \| good	0.157 \| good	3.226 \| good	0.15 \| good
2026-07-12T07:00:00.000Z	58 \| moderate	13.314 \| fine	59.463 \| fine	16.446 \| good	0.149 \| good	2.489 \| good	0.142 \| good
2026-07-12T08:00:00.000Z	44 \| good	8.436 \| good	37.31 \| good	15.751 \| good	0.148 \| good	2.269 \| good	0.138 \| good
2026-07-12T09:00:00.000Z	33 \| good	6.25 \| good	27.485 \| good	15.9 \| good	0.151 \| good	2.317 \| good	0.138 \| good
2026-07-12T10:00:00.000Z	27 \| good	4.844 \| good	21.039 \| good	16.438 \| good	0.153 \| good	2.333 \| good	0.139 \| good
2026-07-12T11:00:00.000Z	27 \| good	5.426 \| good	23.291 \| good	19.031 \| good	0.15 \| good	2.107 \| good	0.143 \| good
2026-07-12T12:00:00.000Z	38 \| good	6.81 \| good	29.999 \| good	24.037 \| good	0.162 \| good	1.414 \| good	0.142 \| good
2026-07-12T13:00:00.000Z	33 \| good	6.386 \| good	28.37 \| good	27.683 \| good	0.18 \| good	0.906 \| good	0.137 \| good
2026-07-12T14:00:00.000Z	33 \| good	6.153 \| good	27.313 \| good	30.388 \| good	0.175 \| good	0.661 \| good	0.137 \| good
2026-07-12T15:00:00.000Z	33 \| good	6.119 \| good	27.103 \| good	32.224 \| good	0.159 \| good	0.502 \| good	0.136 \| good
2026-07-12T16:00:00.000Z	33 \| good	5.587 \| good	23.926 \| good	32.143 \| good	0.148 \| good	0.421 \| good	0.137 \| good
2026-07-12T17:00:00.000Z	29 \| good	5.294 \| good	22.741 \| good	31.131 \| good	0.143 \| good	0.393 \| good	0.138 \| good
2026-07-12T18:00:00.000Z	33 \| good	5.513 \| good	23.74 \| good	31.398 \| good	0.139 \| good	0.405 \| good	0.139 \| good
2026-07-12T19:00:00.000Z	29 \| good	5.009 \| good	21.688 \| good	31.308 \| good	0.137 \| good	0.439 \| good	0.141 \| good
2026-07-12T20:00:00.000Z	30 \| good	5.058 \| good	21.688 \| good	31.952 \| good	0.14 \| good	0.517 \| good	0.143 \| good
2026-07-12T21:00:00.000Z	38 \| good	6.727 \| good	29.895 \| good	34.362 \| good	0.143 \| good	0.657 \| good	0.147 \| good
2026-07-12T22:00:00.000Z	49 \| good	9.412 \| good	42.01 \| good	42.262 \| good	0.148 \| good	0.971 \| good	0.153 \| good
2026-07-12T23:00:00.000Z	54 \| moderate	10.615 \| good	47.143 \| good	39.749 \| good	0.156 \| good	1.85 \| good	0.167 \| good
2026-07-13T00:00:00.000Z	58 \| moderate	12.561 \| fine	56.661 \| fine	32.266 \| good	0.172 \| good	2.941 \| good	0.179 \| good
2026-07-13T01:00:00.000Z	58 \| moderate	12.502 \| fine	56.352 \| fine	28.209 \| good	0.191 \| good	4.229 \| good	0.191 \| good
2026-07-13T02:00:00.000Z	56 \| moderate	12.409 \| fine	55.973 \| fine	27.555 \| good	0.195 \| good	4.534 \| good	0.191 \| good
2026-07-13T03:00:00.000Z	52 \| moderate	9.833 \| good	43.88 \| good	28.644 \| good	0.192 \| good	4.499 \| good	0.188 \| good
2026-07-13T04:00:00.000Z	38 \| good	7.135 \| good	31.613 \| good	27.067 \| good	0.182 \| good	4.177 \| good	0.182 \| good
2026-07-13T05:00:00.000Z	33 \| good	5.953 \| good	25.94 \| good	24.697 \| good	0.173 \| good	3.683 \| good	0.175 \| good
2026-07-13T06:00:00.000Z	38 \| good	7.316 \| good	8.062 \| good	35.616 \| good	0.175 \| good	3.339 \| good	0.169 \| good
2026-07-13T07:00:00.000Z	27 \| good	4.841 \| good	20.879 \| good	23.581 \| good	0.192 \| good	3.277 \| good	0.165 \| good
2026-07-13T08:00:00.000Z	27 \| good	4.974 \| good	21.158 \| good	23.356 \| good	0.229 \| good	3.442 \| good	0.164 \| good
2026-07-13T09:00:00.000Z	33 \| good	6.494 \| good	29.043 \| good	21.898 \| good	0.284 \| good	3.672 \| good	0.163 \| good

Current air quality index in Leominster, Massachusetts today

Common air pollutants in Leominster, Massachusetts

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

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Empower business decisions with accurate air quality data

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

Air quality in nearby cities

Fitchburg, Massachusetts

Lunenburg, Massachusetts

Clinton, Massachusetts

Groton, Massachusetts

Littleton, Massachusetts

Gardner, Massachusetts

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Frequently asked questions

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

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

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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 Leominster, Massachusetts right now?

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

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

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