What is the current concentration of PM10 in Watertown, Massachusetts?

The current PM10 concentration at Watertown, Massachusetts is 17.121 μg/m3.

What is the current concentration of sulfur dioxide (SO2) in Watertown, Massachusetts?

The current sulfur dioxide (SO2) concentration at Watertown, Massachusetts is 0.384 ppb.

What is the current concentration of ozone (O3) in Watertown, Massachusetts?

The current ozone (O3) concentration at Watertown, Massachusetts is 30.094 ppm.

What is the current concentration of nitrogen dioxide (NO2) in Watertown, Massachusetts?

The current nitrogen dioxide (NO2) concentration at Watertown, Massachusetts is 7.136 ppb.

Watertown, Massachusetts live air quality index now

Q: What is the current concentration of PM2.5 in Watertown, Massachusetts?

The current PM2.5 concentration at Watertown, Massachusetts is 4.275 μg/m3.

Stay updated with real-time air quality in Watertown, 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

Watertown, Massachusetts

Last updated: ... (Local time)

Major air pollutants in Watertown, Massachusetts

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

4.28 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

17.12 μg/m³

155

255

425

605+

Ozone (O₃)

30.09 ppb

201

201+

Sulfur Dioxide (SO₂)

0.38 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

7.14 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.19 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

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Watertown, Massachusetts

Scroll To Air Quality Map

Track live Watertown, Massachusetts air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-02-10T06:00:00.000Z	33 \| good	5.57 \| good	25.637 \| good	27.658 \| good	0.34 \| good	16.031 \| good	0.244 \| good
2026-02-10T07:00:00.000Z	33 \| good	5.57 \| good	25.637 \| good	26.355 \| good	0.34 \| good	16.049 \| good	0.241 \| good
2026-02-10T08:00:00.000Z	27 \| good	5.283 \| good	24.282 \| good	24.484 \| good	0.398 \| good	17.838 \| good	0.241 \| good
2026-02-10T09:00:00.000Z	27 \| good	5.191 \| good	24.216 \| good	22.966 \| good	0.402 \| good	24.219 \| good	0.334 \| good
2026-02-10T10:00:00.000Z	33 \| good	5.599 \| good	26.951 \| good	20.041 \| good	0.346 \| good	28.208 \| good	0.386 \| good
2026-02-10T11:00:00.000Z	38 \| good	6.632 \| good	35.108 \| good	16.387 \| good	0.483 \| good	32.947 \| good	0.486 \| good
2026-02-10T12:00:00.000Z	49 \| good	8.789 \| good	48.811 \| good	11.413 \| good	0.653 \| good	37.157 \| good	0.643 \| good
2026-02-10T13:00:00.000Z	49 \| good	8.789 \| good	48.811 \| good	11.141 \| good	0.651 \| good	37.017 \| good	0.653 \| good
2026-02-10T14:00:00.000Z	54 \| moderate	11.205 \| good	60.848 \| fine	16.733 \| good	0.958 \| good	35.403 \| good	0.595 \| good
2026-02-10T15:00:00.000Z	52 \| moderate	10.413 \| good	53.971 \| good	17.692 \| good	0.665 \| good	27.336 \| good	0.35 \| good
2026-02-10T16:00:00.000Z	52 \| moderate	9.631 \| good	49.501 \| good	21.341 \| good	0.497 \| good	23.617 \| good	0.344 \| good
2026-02-10T17:00:00.000Z	49 \| good	9.42 \| good	49.614 \| good	22.625 \| good	0.434 \| good	21.317 \| good	0.296 \| good
2026-02-10T18:00:00.000Z	49 \| good	8.756 \| good	46.031 \| good	26.005 \| good	0.435 \| good	19.637 \| good	0.288 \| good
2026-02-10T19:00:00.000Z	44 \| good	8.422 \| good	44.013 \| good	27.523 \| good	0.372 \| good	18.111 \| good	0.287 \| good
2026-02-10T20:00:00.000Z	49 \| good	8.858 \| good	44.635 \| good	28.699 \| good	0.377 \| good	20.973 \| good	0.419 \| good
2026-02-10T21:00:00.000Z	49 \| good	8.884 \| good	43.587 \| good	26.936 \| good	0.527 \| good	26.613 \| good	0.377 \| good
2026-02-10T22:00:00.000Z	49 \| good	9.436 \| good	46.634 \| good	25.349 \| good	0.696 \| good	33.061 \| good	0.522 \| good
2026-02-10T23:00:00.000Z	52 \| moderate	9.782 \| good	48.355 \| good	20.539 \| good	0.684 \| good	28.473 \| good	0.508 \| good
2026-02-11T00:00:00.000Z	49 \| good	8.677 \| good	40.557 \| good	24.563 \| good	0.624 \| good	18.819 \| good	0.375 \| good
2026-02-11T01:00:00.000Z	38 \| good	7.463 \| good	32.648 \| good	23.441 \| good	2.206 \| good	18.003 \| good	0.466 \| good
2026-02-11T02:00:00.000Z	38 \| good	7.098 \| good	29.94 \| good	22.422 \| good	0.62 \| good	19.933 \| good	0.42 \| good
2026-02-11T03:00:00.000Z	38 \| good	6.923 \| good	28.402 \| good	25.782 \| good	0.624 \| good	23.141 \| good	0.381 \| good
2026-02-11T04:00:00.000Z	38 \| good	7.37 \| good	30.138 \| good	24.239 \| good	2.492 \| good	22.38 \| good	0.42 \| good
2026-02-11T05:00:00.000Z	49 \| good	9.382 \| good	37.914 \| good	28.299 \| good	9.129 \| good	20.879 \| good	0.386 \| good
2026-02-11T06:00:00.000Z	52 \| moderate	10.307 \| good	42.092 \| good	25.708 \| good	2.518 \| good	20.87 \| good	0.42 \| good
2026-02-11T07:00:00.000Z	52 \| moderate	10.307 \| good	42.092 \| good	24.129 \| good	2.363 \| good	20.821 \| good	0.42 \| good
2026-02-11T08:00:00.000Z	52 \| moderate	10.34 \| good	42.267 \| good	23.881 \| good	2.284 \| good	15.392 \| good	0.42 \| good
2026-02-11T09:00:00.000Z	56 \| moderate	12.286 \| fine	49.762 \| good	19.838 \| good	2.223 \| good	27.402 \| good	0.426 \| good
2026-02-11T10:00:00.000Z	58 \| moderate	13.381 \| fine	53.922 \| good	20.407 \| good	0.838 \| good	25.28 \| good	0.468 \| good
2026-02-11T11:00:00.000Z	60 \| moderate	14.088 \| fine	56.454 \| fine	13.774 \| good	0.862 \| good	23.219 \| good	0.462 \| good
2026-02-11T12:00:00.000Z	64 \| moderate	15.85 \| fine	63.013 \| fine	20.53 \| good	0.867 \| good	25.897 \| good	0.514 \| good
2026-02-11T13:00:00.000Z	64 \| moderate	15.85 \| fine	63.013 \| fine	19.197 \| good	0.846 \| good	25.911 \| good	0.513 \| good
2026-02-11T14:00:00.000Z	71 \| moderate	20.298 \| fine	79.432 \| fine	22.259 \| good	0.923 \| good	22.247 \| good	0.558 \| good
2026-02-11T15:00:00.000Z	73 \| moderate	21.132 \| fine	82.547 \| fine	22.783 \| good	0.895 \| good	19.833 \| good	0.558 \| good
2026-02-11T16:00:00.000Z	73 \| moderate	20.829 \| fine	81.103 \| fine	23.95 \| good	0.841 \| good	16.517 \| good	0.436 \| good
2026-02-11T17:00:00.000Z	67 \| moderate	17.745 \| fine	70.091 \| fine	26.147 \| good	0.846 \| good	13.608 \| good	0.433 \| good
2026-02-11T18:00:00.000Z	60 \| moderate	14.183 \| fine	57.433 \| fine	29.295 \| good	0.501 \| good	12.601 \| good	0.249 \| good
2026-02-11T19:00:00.000Z	54 \| moderate	10.728 \| good	43.563 \| good	28.629 \| good	0.5 \| good	10.65 \| good	0.246 \| good
2026-02-11T20:00:00.000Z	44 \| good	8.002 \| good	32.974 \| good	28.342 \| good	0.498 \| good	10.294 \| good	0.249 \| good
2026-02-11T21:00:00.000Z	33 \| good	6.136 \| good	25.38 \| good	28.352 \| good	0.455 \| good	9.802 \| good	0.246 \| good
2026-02-11T22:00:00.000Z	27 \| good	4.762 \| good	20.132 \| good	28.463 \| good	0.446 \| good	10.532 \| good	0.248 \| good
2026-02-11T23:00:00.000Z	24 \| good	3.739 \| good	16.943 \| good	26.442 \| good	0.444 \| good	10.804 \| good	0.248 \| good
2026-02-12T00:00:00.000Z	22 \| good	3.236 \| good	14.163 \| good	24.378 \| good	0.442 \| good	10.234 \| good	0.248 \| good
2026-02-12T01:00:00.000Z	22 \| good	3.039 \| good	13.544 \| good	24.053 \| good	0.445 \| good	9.75 \| good	0.245 \| good
2026-02-12T02:00:00.000Z	24 \| good	2.992 \| good	13.303 \| good	25.781 \| good	0.448 \| good	10.225 \| good	0.245 \| good
2026-02-12T03:00:00.000Z	23 \| good	3.145 \| good	13.178 \| good	24.929 \| good	0.448 \| good	8.911 \| good	0.196 \| good
2026-02-12T04:00:00.000Z	24 \| good	3.607 \| good	14.96 \| good	26.293 \| good	0.637 \| good	8.327 \| good	0.193 \| good
2026-02-12T05:00:00.000Z	29 \| good	4.076 \| good	16.827 \| good	30.799 \| good	0.45 \| good	6.889 \| good	0.19 \| good
2026-02-12T05:00:00.000Z	28 \| good	4.275 \| good	17.121 \| good	30.094 \| good	0.384 \| good	7.136 \| good	0.189 \| good
2026-02-12T06:00:00.000Z	64 \| moderate	15.743 \| fine	69.92 \| fine	37.108 \| good	0.644 \| good	3.024 \| good	0.173 \| good
2026-02-12T07:00:00.000Z	58 \| moderate	13.464 \| fine	60.871 \| fine	37.051 \| good	0.609 \| good	2.851 \| good	0.169 \| good
2026-02-12T08:00:00.000Z	56 \| moderate	11.806 \| good	52.233 \| good	34.638 \| good	0.574 \| good	2.678 \| good	0.165 \| good
2026-02-12T09:00:00.000Z	58 \| moderate	12.816 \| fine	57.34 \| fine	29.755 \| good	0.54 \| good	2.505 \| good	0.161 \| good
2026-02-12T10:00:00.000Z	60 \| moderate	14.043 \| fine	62.961 \| fine	26.892 \| good	0.585 \| good	3.401 \| good	0.167 \| good
2026-02-12T11:00:00.000Z	64 \| moderate	16.233 \| fine	71.763 \| fine	22.741 \| good	0.631 \| good	4.297 \| good	0.173 \| good
2026-02-12T12:00:00.000Z	66 \| moderate	16.731 \| fine	73.904 \| fine	22.832 \| good	0.676 \| good	5.193 \| good	0.178 \| good
2026-02-12T13:00:00.000Z	64 \| moderate	15.556 \| fine	69.146 \| fine	25.898 \| good	0.726 \| good	4.719 \| good	0.182 \| good
2026-02-12T14:00:00.000Z	58 \| moderate	12.886 \| fine	58.058 \| fine	32.124 \| good	0.776 \| good	4.245 \| good	0.186 \| good
2026-02-12T15:00:00.000Z	54 \| moderate	11.065 \| good	49.238 \| good	35.34 \| good	0.825 \| good	3.771 \| good	0.19 \| good
2026-02-12T16:00:00.000Z	56 \| moderate	11.728 \| good	51.733 \| good	37 \| good	0.731 \| good	3.103 \| good	0.18 \| good
2026-02-12T17:00:00.000Z	54 \| moderate	10.786 \| good	47.715 \| good	35.737 \| good	0.636 \| good	2.436 \| good	0.17 \| good
2026-02-12T18:00:00.000Z	52 \| moderate	10.487 \| good	46.524 \| good	35.857 \| good	0.541 \| good	1.768 \| good	0.161 \| good
2026-02-12T19:00:00.000Z	52 \| moderate	9.714 \| good	43.035 \| good	37.447 \| good	0.55 \| good	2.534 \| good	0.163 \| good
2026-02-12T20:00:00.000Z	34 \| good	5.674 \| good	25.249 \| good	36.589 \| good	0.559 \| good	3.3 \| good	0.164 \| good
2026-02-12T21:00:00.000Z	32 \| good	2.417 \| good	9.971 \| good	34.64 \| good	0.569 \| good	4.066 \| good	0.166 \| good
2026-02-12T22:00:00.000Z	27 \| good	3.662 \| good	15.965 \| good	29.419 \| good	0.583 \| good	5.568 \| good	0.172 \| good
2026-02-12T23:00:00.000Z	23 \| good	3.05 \| good	12.87 \| good	25.055 \| good	0.598 \| good	7.069 \| good	0.178 \| good
2026-02-13T00:00:00.000Z	24 \| good	4.381 \| good	19.244 \| good	25.671 \| good	0.612 \| good	8.571 \| good	0.184 \| good
2026-02-13T01:00:00.000Z	24 \| good	3.584 \| good	15.812 \| good	26.332 \| good	0.623 \| good	7.901 \| good	0.18 \| good
2026-02-13T02:00:00.000Z	28 \| good	3.729 \| good	16.536 \| good	29.532 \| good	0.633 \| good	7.231 \| good	0.177 \| good
2026-02-13T03:00:00.000Z	32 \| good	3.098 \| good	13.171 \| good	35.047 \| good	0.643 \| good	6.561 \| good	0.173 \| good
2026-02-13T04:00:00.000Z	32 \| good	3.736 \| good	16.086 \| good	35.487 \| good	0.612 \| good	5.723 \| good	0.17 \| good
2026-02-13T05:00:00.000Z	31 \| good	4.213 \| good	18.396 \| good	34.076 \| good	0.58 \| good	4.885 \| good	0.166 \| good
2026-02-13T06:00:00.000Z	30 \| good	4.908 \| good	21.421 \| good	31.619 \| good	0.548 \| good	4.046 \| good	0.163 \| good
2026-02-13T07:00:00.000Z	29 \| good	4.983 \| good	21.762 \| good	30.828 \| good	0.527 \| good	3.835 \| good	0.161 \| good
2026-02-13T08:00:00.000Z	24 \| good	4.299 \| good	18.688 \| good	26.467 \| good	0.506 \| good	3.623 \| good	0.158 \| good
2026-02-13T09:00:00.000Z	22 \| good	4.192 \| good	18.337 \| good	23.053 \| good	0.484 \| good	3.411 \| good	0.156 \| good
2026-02-13T10:00:00.000Z	22 \| good	4.294 \| good	18.974 \| good	21.19 \| good	0.53 \| good	4.752 \| good	0.162 \| good
2026-02-13T11:00:00.000Z	16 \| good	3.258 \| good	14.371 \| good	17.435 \| good	0.575 \| good	6.092 \| good	0.168 \| good
2026-02-13T12:00:00.000Z	17 \| good	2.619 \| good	10.579 \| good	18.173 \| good	0.621 \| good	7.432 \| good	0.175 \| good
2026-02-13T13:00:00.000Z	22 \| good	2.347 \| good	9.623 \| good	23.853 \| good	0.702 \| good	6.634 \| good	0.177 \| good
2026-02-13T14:00:00.000Z	29 \| good	2.522 \| good	10.256 \| good	31.017 \| good	0.784 \| good	5.836 \| good	0.18 \| good
2026-02-13T15:00:00.000Z	31 \| good	1.777 \| good	7.496 \| good	34.224 \| good	0.865 \| good	5.039 \| good	0.183 \| good
2026-02-13T16:00:00.000Z	33 \| good	0.856 \| good	3.507 \| good	36.318 \| good	0.869 \| good	4.533 \| good	0.176 \| good
2026-02-13T17:00:00.000Z	32 \| good	0.625 \| good	2.513 \| good	34.765 \| good	0.874 \| good	4.027 \| good	0.169 \| good
2026-02-13T18:00:00.000Z	31 \| good	1.206 \| good	4.883 \| good	32.849 \| good	0.878 \| good	3.521 \| good	0.163 \| good
2026-02-13T19:00:00.000Z	31 \| good	0.782 \| good	3.084 \| good	33.147 \| good	0.85 \| good	4.716 \| good	0.168 \| good
2026-02-13T20:00:00.000Z	31 \| good	1.007 \| good	4.027 \| good	33.697 \| good	0.822 \| good	5.91 \| good	0.173 \| good
2026-02-13T21:00:00.000Z	27 \| good	0.933 \| good	3.597 \| good	28.694 \| good	0.794 \| good	7.104 \| good	0.178 \| good
2026-02-13T22:00:00.000Z	20 \| good	2.768 \| good	11.205 \| good	21.948 \| good	0.893 \| good	15.42 \| good	0.237 \| good
2026-02-13T23:00:00.000Z	23 \| good	4.235 \| good	18.392 \| good	19.954 \| good	0.993 \| good	23.736 \| good	0.295 \| good
2026-02-14T00:00:00.000Z	30 \| good	3.41 \| good	15.022 \| good	23.815 \| good	1.093 \| good	32.052 \| good	0.354 \| good
2026-02-14T01:00:00.000Z	26 \| good	3.567 \| good	15.588 \| good	23.283 \| good	0.999 \| good	28.262 \| good	0.32 \| good
2026-02-14T02:00:00.000Z	27 \| good	5.448 \| good	23.58 \| good	21.735 \| good	0.906 \| good	24.472 \| good	0.287 \| good
2026-02-14T03:00:00.000Z	38 \| good	7.035 \| good	31.224 \| good	25.189 \| good	0.813 \| good	20.682 \| good	0.253 \| good
2026-02-14T04:00:00.000Z	38 \| good	6.957 \| good	30.933 \| good	28.113 \| good	0.73 \| good	16.636 \| good	0.234 \| good
2026-02-14T05:00:00.000Z	33 \| good	6.099 \| good	27 \| good	30.904 \| good	0.646 \| good	12.59 \| good	0.216 \| good

Watertown

Get reliable air quality data to drive your business

Watertown, Massachusetts air quality map: Track AQI near you

0.18ppm

How accurate is Massachusetts, USA air quality data?

Air quality data and pollutant measurements for Massachusetts, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.

Source: Ambee Data Sources

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Frequently asked questions

How often is the air quality data for Watertown, Massachusetts updated?

The air quality for Watertown, Massachusetts is updated every hour.

When was the worst air quality at Watertown, Massachusetts in the last 24 hrs?

The worst air quality in Watertown, Massachusetts in the last 24 hours was observed at 04:00:00 on 2026-02-11.

When was the best air quality at Watertown, Massachusetts in the last 24 hrs?

In the last 24 hrs, the best air quality in Watertown, Massachusetts was observed at 01:00:00 on 2026-02-12.

What is the current air quality in Watertown, Massachusetts?

The current air quality in Watertown, Massachusetts is 28, categorized as Good based on real-time data.

What pollutant is the most common in Watertown, Massachusetts?

The most common pollutant in Watertown, Massachusetts is O3.

What should I do if the air quality in Watertown, Massachusetts is poor?

If the air quality in Watertown, Massachusetts is poor, consider staying indoors and wearing a mask to protect yourself.

What is the current concentration of PM_2.5 in Watertown, Massachusetts?

The current PM_2.5 concentration at Watertown, Massachusetts is 4.275 μg/m³.

What is the current concentration of PM₁₀ in Watertown, Massachusetts?

The current PM₁₀ concentration at Watertown, Massachusetts is 17.121 μg/m³.

What is the current concentration of carbon monoxide (CO) in Watertown, Massachusetts?

The current carbon monoxide (CO) concentration at Watertown, Massachusetts is 0.189 ppm.

What is the current concentration of sulfur dioxide (SO₂) in Watertown, Massachusetts?

The current sulfur dioxide (SO₂) concentration at Watertown, Massachusetts is 0.384 ppb.

What is the current concentration of ozone (O₃) in Watertown, Massachusetts?

The current ozone (O₃) concentration at Watertown, Massachusetts is 30.094 ppm.

What is the current concentration of nitrogen dioxide (NO₂) in Watertown, Massachusetts?

The current nitrogen dioxide (NO₂) concentration at Watertown, Massachusetts is 7.136 ppb.

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