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

The current PM10 concentration at Watertown, Massachusetts is 49.784 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Watertown, Massachusetts is 0.555 ppb.

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

The current ozone (O3) concentration at Watertown, Massachusetts is 17.967 ppm.

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

The current nitrogen dioxide (NO2) concentration at Watertown, Massachusetts is 12.746 ppb.

Live air quality index in Watertown, Massachusetts today

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

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)

Moderate

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)

12.97 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

49.78 μg/m³

155

255

425

605+

Ozone (O₃)

17.97 ppb

201

201+

Sulfur Dioxide (SO₂)

0.56 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

12.75 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.20 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Watertown, Massachusetts

Get Live Pollen Counts

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
2025-06-05T22:00:00.000Z	87 \| moderate	21.345 \| fine	81.597 \| fine	65.852 \| fine	0.503 \| good	12.157 \| good	0.391 \| good
2025-06-05T23:00:00.000Z	77 \| moderate	21.223 \| fine	81.153 \| fine	62.788 \| fine	0.584 \| good	13.054 \| good	0.386 \| good
2025-06-06T00:00:00.000Z	73 \| moderate	21.228 \| fine	81.824 \| fine	58.49 \| fine	0.505 \| good	10.643 \| good	0.389 \| good
2025-06-06T01:00:00.000Z	73 \| moderate	21.113 \| fine	80.779 \| fine	58.014 \| fine	0.499 \| good	8.453 \| good	0.389 \| good
2025-06-06T02:00:00.000Z	73 \| moderate	21.032 \| fine	80.324 \| fine	56.008 \| fine	0.499 \| good	10.242 \| good	0.389 \| good
2025-06-06T03:00:00.000Z	80 \| moderate	21.086 \| fine	80.097 \| fine	64.069 \| fine	0.508 \| good	9.393 \| good	0.391 \| good
2025-06-06T04:00:00.000Z	74 \| moderate	21.086 \| fine	80.097 \| fine	61.557 \| fine	0.512 \| good	9.014 \| good	0.384 \| good
2025-06-06T05:00:00.000Z	73 \| moderate	21.086 \| fine	80.097 \| fine	54.175 \| good	0.725 \| good	13.289 \| good	0.279 \| good
2025-06-06T06:00:00.000Z	69 \| moderate	19.396 \| fine	78.138 \| fine	43.361 \| good	0.731 \| good	18.081 \| good	0.213 \| good
2025-06-06T07:00:00.000Z	66 \| moderate	17.408 \| fine	58.707 \| fine	50.979 \| good	0.509 \| good	6.934 \| good	0.287 \| good
2025-06-06T08:00:00.000Z	75 \| moderate	21.568 \| fine	77.04 \| fine	55.27 \| fine	0.506 \| good	7.356 \| good	0.283 \| good
2025-06-06T09:00:00.000Z	75 \| moderate	21.787 \| fine	80.915 \| fine	49.207 \| good	0.566 \| good	9.157 \| good	0.289 \| good
2025-06-06T10:00:00.000Z	75 \| moderate	21.978 \| fine	81.836 \| fine	43.323 \| good	0.555 \| good	7.878 \| good	0.289 \| good
2025-06-06T11:00:00.000Z	73 \| moderate	21.133 \| fine	78.37 \| fine	43.212 \| good	0.475 \| good	7.005 \| good	0.254 \| good
2025-06-06T12:00:00.000Z	71 \| moderate	20.026 \| fine	74.722 \| fine	39.226 \| good	0.508 \| good	15.416 \| good	0.249 \| good
2025-06-06T13:00:00.000Z	67 \| moderate	18.274 \| fine	69.324 \| fine	40.809 \| good	0.553 \| good	13.339 \| good	0.244 \| good
2025-06-06T14:00:00.000Z	66 \| moderate	16.539 \| fine	63.621 \| fine	40.466 \| good	0.489 \| good	9.912 \| good	0.244 \| good
2025-06-06T15:00:00.000Z	62 \| moderate	15.162 \| fine	58.985 \| fine	39.072 \| good	0.306 \| good	11.417 \| good	0.244 \| good
2025-06-06T16:00:00.000Z	60 \| moderate	14.394 \| fine	55.973 \| fine	43.003 \| good	0.567 \| good	10.165 \| good	0.244 \| good
2025-06-06T17:00:00.000Z	58 \| moderate	13.425 \| fine	53.11 \| good	42.473 \| good	0.481 \| good	7.075 \| good	0.202 \| good
2025-06-06T18:00:00.000Z	58 \| moderate	13.382 \| fine	54.332 \| good	38.645 \| good	0.481 \| good	6.916 \| good	0.244 \| good
2025-06-06T19:00:00.000Z	60 \| moderate	14.187 \| fine	57.349 \| fine	36.966 \| good	0.292 \| good	11.634 \| good	0.249 \| good
2025-06-06T20:00:00.000Z	62 \| moderate	15.201 \| fine	60.247 \| fine	33.569 \| good	0.39 \| good	12.196 \| good	0.205 \| good
2025-06-06T21:00:00.000Z	62 \| moderate	15.317 \| fine	59.963 \| fine	33.589 \| good	0.774 \| good	11.405 \| good	0.252 \| good
2025-06-06T22:00:00.000Z	64 \| moderate	15.626 \| fine	60.429 \| fine	33.825 \| good	0.571 \| good	13.966 \| good	0.249 \| good
2025-06-06T23:00:00.000Z	64 \| moderate	16.452 \| fine	63.248 \| fine	37.938 \| good	0.664 \| good	13.741 \| good	0.21 \| good
2025-06-07T00:00:00.000Z	67 \| moderate	17.886 \| fine	68.078 \| fine	28.678 \| good	0.729 \| good	17.147 \| good	0.252 \| good
2025-06-07T01:00:00.000Z	69 \| moderate	19.022 \| fine	71.032 \| fine	31.327 \| good	0.596 \| good	22.471 \| good	0.299 \| good
2025-06-07T02:00:00.000Z	71 \| moderate	20.034 \| fine	74.576 \| fine	35.068 \| good	0.488 \| good	12.417 \| good	0.338 \| good
2025-06-07T03:00:00.000Z	73 \| moderate	20.535 \| fine	76.336 \| fine	34.73 \| good	0.656 \| good	16.85 \| good	0.291 \| good
2025-06-07T04:00:00.000Z	73 \| moderate	20.535 \| fine	76.336 \| fine	33.804 \| good	0.637 \| good	17.87 \| good	0.29 \| good
2025-06-07T05:00:00.000Z	73 \| moderate	20.535 \| fine	76.336 \| fine	33.371 \| good	0.945 \| good	5.468 \| good	0.148 \| good
2025-06-07T06:00:00.000Z	33 \| good	5.827 \| good	29.836 \| good	33.467 \| good	0.941 \| good	22.936 \| good	0.146 \| good
2025-06-07T07:00:00.000Z	33 \| good	5.78 \| good	20.579 \| good	31.343 \| good	0.453 \| good	4.946 \| good	0.279 \| good
2025-06-07T08:00:00.000Z	69 \| moderate	19.16 \| fine	70.844 \| fine	34.742 \| good	0.47 \| good	5.228 \| good	0.279 \| good
2025-06-07T09:00:00.000Z	69 \| moderate	18.632 \| fine	68.997 \| fine	26.767 \| good	0.486 \| good	6.515 \| good	0.283 \| good
2025-06-07T10:00:00.000Z	62 \| moderate	14.811 \| fine	55.827 \| fine	26.496 \| good	0.471 \| good	4.919 \| good	0.191 \| good
2025-06-07T11:00:00.000Z	56 \| moderate	12.143 \| fine	46.856 \| good	22.638 \| good	0.437 \| good	4.159 \| good	0.192 \| good
2025-06-07T12:00:00.000Z	54 \| moderate	11.428 \| good	45.218 \| good	20.338 \| good	0.54 \| good	5.08 \| good	0.192 \| good
2025-06-07T13:00:00.000Z	60 \| moderate	14.012 \| fine	53.783 \| good	20.007 \| good	0.559 \| good	11.484 \| good	0.294 \| good
2025-06-07T14:00:00.000Z	66 \| moderate	17.052 \| fine	64.971 \| fine	24.28 \| good	0.656 \| good	11.389 \| good	0.294 \| good
2025-06-07T15:00:00.000Z	67 \| moderate	17.909 \| fine	69.198 \| fine	23.305 \| good	0.594 \| good	9.108 \| good	0.247 \| good
2025-06-07T16:00:00.000Z	66 \| moderate	17.346 \| fine	66.778 \| fine	23.645 \| good	0.638 \| good	14.975 \| good	0.244 \| good
2025-06-07T17:00:00.000Z	66 \| moderate	16.723 \| fine	64.235 \| fine	18.493 \| good	0.827 \| good	20.543 \| good	0.252 \| good
2025-06-07T18:00:00.000Z	64 \| moderate	15.523 \| fine	59.555 \| fine	19.475 \| good	0.758 \| good	16.338 \| good	0.203 \| good
2025-06-07T19:00:00.000Z	58 \| moderate	12.974 \| fine	49.784 \| good	17.967 \| good	0.555 \| good	12.746 \| good	0.199 \| good
2025-06-07T20:00:00.000Z	54 \| moderate	11.466 \| good	43.517 \| good	22.354 \| good	0.58 \| good	11.09 \| good	0.246 \| good
2025-06-07T21:00:00.000Z	52 \| moderate	9.989 \| good	37.726 \| good	21.29 \| good	0.554 \| good	10.926 \| good	0.3 \| good
2025-06-07T20:00:00.000Z	58 \| moderate	12.974 \| fine	49.784 \| good	17.967 \| good	0.555 \| good	12.746 \| good	0.199 \| good
2025-06-07T21:00:00.000Z	30 \| good	5.469 \| good	23.127 \| good	31.584 \| good	1.433 \| good	12.128 \| good	0.275 \| good
2025-06-07T22:00:00.000Z	49 \| good	9.269 \| good	40.956 \| good	34.723 \| good	0.856 \| good	10.017 \| good	0.282 \| good
2025-06-07T23:00:00.000Z	58 \| moderate	12.91 \| fine	58.69 \| fine	36.901 \| good	1.172 \| good	12.733 \| good	0.29 \| good
2025-06-08T00:00:00.000Z	44 \| good	8.463 \| good	36.868 \| good	36.455 \| good	1.489 \| good	15.449 \| good	0.297 \| good
2025-06-08T01:00:00.000Z	52 \| moderate	10.36 \| good	45.774 \| good	31.21 \| good	0.74 \| good	7.876 \| good	0.299 \| good
2025-06-08T02:00:00.000Z	58 \| moderate	12.675 \| fine	56.672 \| fine	30.083 \| good	0.882 \| good	10.01 \| good	0.303 \| good
2025-06-08T03:00:00.000Z	58 \| moderate	13.469 \| fine	60.743 \| fine	31.741 \| good	1.025 \| good	12.144 \| good	0.307 \| good
2025-06-08T04:00:00.000Z	58 \| moderate	13.069 \| fine	58.697 \| fine	33.053 \| good	0.707 \| good	5.771 \| good	0.335 \| good
2025-06-08T05:00:00.000Z	56 \| moderate	12.129 \| fine	54.777 \| good	32.478 \| good	0.897 \| good	7.342 \| good	0.336 \| good
2025-06-08T06:00:00.000Z	56 \| moderate	12.008 \| good	53.892 \| good	29.727 \| good	1.087 \| good	8.912 \| good	0.338 \| good
2025-06-08T07:00:00.000Z	56 \| moderate	11.852 \| good	52.066 \| good	27.988 \| good	0.711 \| good	4.204 \| good	0.323 \| good
2025-06-08T08:00:00.000Z	58 \| moderate	12.876 \| fine	57.046 \| fine	25.754 \| good	0.916 \| good	5.752 \| good	0.331 \| good
2025-06-08T09:00:00.000Z	60 \| moderate	14.222 \| fine	62.97 \| fine	19.866 \| good	1.121 \| good	7.299 \| good	0.34 \| good
2025-06-08T10:00:00.000Z	58 \| moderate	12.917 \| fine	58.825 \| fine	20.318 \| good	0.741 \| good	3.607 \| good	0.32 \| good
2025-06-08T11:00:00.000Z	56 \| moderate	12.103 \| fine	54.804 \| good	21.013 \| good	0.87 \| good	4.444 \| good	0.337 \| good
2025-06-08T12:00:00.000Z	54 \| moderate	11.11 \| good	48.951 \| good	25.528 \| good	0.998 \| good	5.28 \| good	0.354 \| good
2025-06-08T13:00:00.000Z	54 \| moderate	11.181 \| good	49.033 \| good	29.819 \| good	0.716 \| good	2.444 \| good	0.274 \| good
2025-06-08T14:00:00.000Z	56 \| moderate	12.241 \| fine	55.027 \| fine	31.409 \| good	0.779 \| good	2.792 \| good	0.275 \| good
2025-06-08T15:00:00.000Z	58 \| moderate	13.097 \| fine	58.989 \| fine	34.078 \| good	0.842 \| good	3.139 \| good	0.276 \| good
2025-06-08T16:00:00.000Z	62 \| moderate	14.5 \| fine	65 \| fine	34.853 \| good	0.657 \| good	2.082 \| good	0.25 \| good
2025-06-08T17:00:00.000Z	64 \| moderate	16.133 \| fine	71.099 \| fine	34.724 \| good	0.688 \| good	2.291 \| good	0.249 \| good
2025-06-08T18:00:00.000Z	67 \| moderate	17.669 \| fine	78.876 \| fine	35.67 \| good	0.718 \| good	2.5 \| good	0.247 \| good
2025-06-08T19:00:00.000Z	66 \| moderate	16.885 \| fine	74.98 \| fine	37.253 \| good	0.689 \| good	3.604 \| good	0.273 \| good
2025-06-08T20:00:00.000Z	66 \| moderate	17.446 \| fine	76.967 \| fine	35.786 \| good	0.734 \| good	3.998 \| good	0.274 \| good
2025-06-08T21:00:00.000Z	66 \| moderate	16.569 \| fine	73.025 \| fine	34.66 \| good	0.779 \| good	4.392 \| good	0.276 \| good
2025-06-08T22:00:00.000Z	64 \| moderate	16.246 \| fine	72.921 \| fine	35.011 \| good	0.83 \| good	7.296 \| good	0.308 \| good
2025-06-08T23:00:00.000Z	66 \| moderate	17.143 \| fine	76.955 \| fine	31.683 \| good	0.867 \| good	8.644 \| good	0.315 \| good
2025-06-09T00:00:00.000Z	62 \| moderate	14.711 \| fine	64.977 \| fine	26.125 \| good	0.904 \| good	9.992 \| good	0.323 \| good
2025-06-09T01:00:00.000Z	56 \| moderate	12.166 \| fine	54.96 \| good	22.26 \| good	0.855 \| good	9.628 \| good	0.323 \| good
2025-06-09T02:00:00.000Z	49 \| good	9.438 \| good	42.079 \| good	24.678 \| good	0.867 \| good	12.721 \| good	0.344 \| good
2025-06-09T03:00:00.000Z	52 \| moderate	10.053 \| good	45.031 \| good	27.754 \| good	0.878 \| good	15.815 \| good	0.364 \| good
2025-06-09T04:00:00.000Z	54 \| moderate	11.124 \| good	49.008 \| good	30.121 \| good	0.781 \| good	4.71 \| good	0.29 \| good
2025-06-09T05:00:00.000Z	56 \| moderate	11.628 \| good	51.075 \| good	33.331 \| good	0.759 \| good	4.845 \| good	0.291 \| good
2025-06-09T06:00:00.000Z	54 \| moderate	10.544 \| good	46.992 \| good	34.569 \| good	0.737 \| good	4.979 \| good	0.292 \| good
2025-06-09T07:00:00.000Z	52 \| moderate	10.141 \| good	45.015 \| good	33.295 \| good	0.724 \| good	2.673 \| good	0.265 \| good
2025-06-09T08:00:00.000Z	56 \| moderate	11.662 \| good	51.052 \| good	30.868 \| good	0.724 \| good	2.692 \| good	0.263 \| good
2025-06-09T09:00:00.000Z	56 \| moderate	11.942 \| good	53.988 \| good	25.744 \| good	0.724 \| good	2.712 \| good	0.261 \| good
2025-06-09T10:00:00.000Z	54 \| moderate	11.217 \| good	49.984 \| good	25.439 \| good	0.667 \| good	4.268 \| good	0.256 \| good
2025-06-09T11:00:00.000Z	54 \| moderate	11.298 \| good	49.979 \| good	27.862 \| good	0.686 \| good	4.547 \| good	0.253 \| good
2025-06-09T12:00:00.000Z	56 \| moderate	12.323 \| fine	54.967 \| good	28.049 \| good	0.705 \| good	4.826 \| good	0.251 \| good
2025-06-09T13:00:00.000Z	56 \| moderate	11.549 \| good	51.076 \| good	31.188 \| good	0.65 \| good	4.95 \| good	0.212 \| good
2025-06-09T14:00:00.000Z	54 \| moderate	10.664 \| good	46.952 \| good	32.393 \| good	0.681 \| good	5.049 \| good	0.202 \| good
2025-06-09T15:00:00.000Z	52 \| moderate	10.271 \| good	45.001 \| good	34.674 \| good	0.713 \| good	5.148 \| good	0.191 \| good
2025-06-09T16:00:00.000Z	52 \| moderate	10.116 \| good	44.97 \| good	37.521 \| good	0.66 \| good	3.891 \| good	0.168 \| good
2025-06-09T17:00:00.000Z	52 \| moderate	9.969 \| good	44.01 \| good	38.86 \| good	0.679 \| good	3.937 \| good	0.166 \| good
2025-06-09T18:00:00.000Z	52 \| moderate	9.898 \| good	43.955 \| good	38.991 \| good	0.698 \| good	3.983 \| good	0.164 \| good
2025-06-09T19:00:00.000Z	52 \| moderate	10.126 \| good	44.966 \| good	38.952 \| good	0.556 \| good	4.51 \| good	0.21 \| good
2025-06-09T20:00:00.000Z	52 \| moderate	10.192 \| good	44.984 \| good	36.994 \| good	0.589 \| good	4.668 \| good	0.212 \| good

Watertown

Get reliable air quality data to drive your business

Watertown, Massachusetts air quality map: Track AQI near you

0.20ppm

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 05:00:00 on 2025-06-07.

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 07:00:00 on 2025-06-07.

What is the current air quality in Watertown, Massachusetts?

The current air quality in Watertown, Massachusetts is 58, categorized as Moderate based on real-time data.

What pollutant is the most common in Watertown, Massachusetts?

The most common pollutant in Watertown, Massachusetts is PM2.5.

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 12.974 μg/m³.

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

The current PM₁₀ concentration at Watertown, Massachusetts is 49.784 μg/m³.

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

The current carbon monoxide (CO) concentration at Watertown, Massachusetts is 0.199 ppm.

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

The current sulfur dioxide (SO₂) concentration at Watertown, Massachusetts is 0.555 ppb.

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

The current ozone (O₃) concentration at Watertown, Massachusetts is 17.967 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Watertown, Massachusetts is 12.746 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-06-05T22:00:00.000Z	87 \| moderate	21.345 \| fine	81.597 \| fine	65.852 \| fine	0.503 \| good	12.157 \| good	0.391 \| good
2025-06-05T23:00:00.000Z	77 \| moderate	21.223 \| fine	81.153 \| fine	62.788 \| fine	0.584 \| good	13.054 \| good	0.386 \| good
2025-06-06T00:00:00.000Z	73 \| moderate	21.228 \| fine	81.824 \| fine	58.49 \| fine	0.505 \| good	10.643 \| good	0.389 \| good
2025-06-06T01:00:00.000Z	73 \| moderate	21.113 \| fine	80.779 \| fine	58.014 \| fine	0.499 \| good	8.453 \| good	0.389 \| good
2025-06-06T02:00:00.000Z	73 \| moderate	21.032 \| fine	80.324 \| fine	56.008 \| fine	0.499 \| good	10.242 \| good	0.389 \| good
2025-06-06T03:00:00.000Z	80 \| moderate	21.086 \| fine	80.097 \| fine	64.069 \| fine	0.508 \| good	9.393 \| good	0.391 \| good
2025-06-06T04:00:00.000Z	74 \| moderate	21.086 \| fine	80.097 \| fine	61.557 \| fine	0.512 \| good	9.014 \| good	0.384 \| good
2025-06-06T05:00:00.000Z	73 \| moderate	21.086 \| fine	80.097 \| fine	54.175 \| good	0.725 \| good	13.289 \| good	0.279 \| good
2025-06-06T06:00:00.000Z	69 \| moderate	19.396 \| fine	78.138 \| fine	43.361 \| good	0.731 \| good	18.081 \| good	0.213 \| good
2025-06-06T07:00:00.000Z	66 \| moderate	17.408 \| fine	58.707 \| fine	50.979 \| good	0.509 \| good	6.934 \| good	0.287 \| good
2025-06-06T08:00:00.000Z	75 \| moderate	21.568 \| fine	77.04 \| fine	55.27 \| fine	0.506 \| good	7.356 \| good	0.283 \| good
2025-06-06T09:00:00.000Z	75 \| moderate	21.787 \| fine	80.915 \| fine	49.207 \| good	0.566 \| good	9.157 \| good	0.289 \| good
2025-06-06T10:00:00.000Z	75 \| moderate	21.978 \| fine	81.836 \| fine	43.323 \| good	0.555 \| good	7.878 \| good	0.289 \| good
2025-06-06T11:00:00.000Z	73 \| moderate	21.133 \| fine	78.37 \| fine	43.212 \| good	0.475 \| good	7.005 \| good	0.254 \| good
2025-06-06T12:00:00.000Z	71 \| moderate	20.026 \| fine	74.722 \| fine	39.226 \| good	0.508 \| good	15.416 \| good	0.249 \| good
2025-06-06T13:00:00.000Z	67 \| moderate	18.274 \| fine	69.324 \| fine	40.809 \| good	0.553 \| good	13.339 \| good	0.244 \| good
2025-06-06T14:00:00.000Z	66 \| moderate	16.539 \| fine	63.621 \| fine	40.466 \| good	0.489 \| good	9.912 \| good	0.244 \| good
2025-06-06T15:00:00.000Z	62 \| moderate	15.162 \| fine	58.985 \| fine	39.072 \| good	0.306 \| good	11.417 \| good	0.244 \| good
2025-06-06T16:00:00.000Z	60 \| moderate	14.394 \| fine	55.973 \| fine	43.003 \| good	0.567 \| good	10.165 \| good	0.244 \| good
2025-06-06T17:00:00.000Z	58 \| moderate	13.425 \| fine	53.11 \| good	42.473 \| good	0.481 \| good	7.075 \| good	0.202 \| good
2025-06-06T18:00:00.000Z	58 \| moderate	13.382 \| fine	54.332 \| good	38.645 \| good	0.481 \| good	6.916 \| good	0.244 \| good
2025-06-06T19:00:00.000Z	60 \| moderate	14.187 \| fine	57.349 \| fine	36.966 \| good	0.292 \| good	11.634 \| good	0.249 \| good
2025-06-06T20:00:00.000Z	62 \| moderate	15.201 \| fine	60.247 \| fine	33.569 \| good	0.39 \| good	12.196 \| good	0.205 \| good
2025-06-06T21:00:00.000Z	62 \| moderate	15.317 \| fine	59.963 \| fine	33.589 \| good	0.774 \| good	11.405 \| good	0.252 \| good
2025-06-06T22:00:00.000Z	64 \| moderate	15.626 \| fine	60.429 \| fine	33.825 \| good	0.571 \| good	13.966 \| good	0.249 \| good
2025-06-06T23:00:00.000Z	64 \| moderate	16.452 \| fine	63.248 \| fine	37.938 \| good	0.664 \| good	13.741 \| good	0.21 \| good
2025-06-07T00:00:00.000Z	67 \| moderate	17.886 \| fine	68.078 \| fine	28.678 \| good	0.729 \| good	17.147 \| good	0.252 \| good
2025-06-07T01:00:00.000Z	69 \| moderate	19.022 \| fine	71.032 \| fine	31.327 \| good	0.596 \| good	22.471 \| good	0.299 \| good
2025-06-07T02:00:00.000Z	71 \| moderate	20.034 \| fine	74.576 \| fine	35.068 \| good	0.488 \| good	12.417 \| good	0.338 \| good
2025-06-07T03:00:00.000Z	73 \| moderate	20.535 \| fine	76.336 \| fine	34.73 \| good	0.656 \| good	16.85 \| good	0.291 \| good
2025-06-07T04:00:00.000Z	73 \| moderate	20.535 \| fine	76.336 \| fine	33.804 \| good	0.637 \| good	17.87 \| good	0.29 \| good
2025-06-07T05:00:00.000Z	73 \| moderate	20.535 \| fine	76.336 \| fine	33.371 \| good	0.945 \| good	5.468 \| good	0.148 \| good
2025-06-07T06:00:00.000Z	33 \| good	5.827 \| good	29.836 \| good	33.467 \| good	0.941 \| good	22.936 \| good	0.146 \| good
2025-06-07T07:00:00.000Z	33 \| good	5.78 \| good	20.579 \| good	31.343 \| good	0.453 \| good	4.946 \| good	0.279 \| good
2025-06-07T08:00:00.000Z	69 \| moderate	19.16 \| fine	70.844 \| fine	34.742 \| good	0.47 \| good	5.228 \| good	0.279 \| good
2025-06-07T09:00:00.000Z	69 \| moderate	18.632 \| fine	68.997 \| fine	26.767 \| good	0.486 \| good	6.515 \| good	0.283 \| good
2025-06-07T10:00:00.000Z	62 \| moderate	14.811 \| fine	55.827 \| fine	26.496 \| good	0.471 \| good	4.919 \| good	0.191 \| good
2025-06-07T11:00:00.000Z	56 \| moderate	12.143 \| fine	46.856 \| good	22.638 \| good	0.437 \| good	4.159 \| good	0.192 \| good
2025-06-07T12:00:00.000Z	54 \| moderate	11.428 \| good	45.218 \| good	20.338 \| good	0.54 \| good	5.08 \| good	0.192 \| good
2025-06-07T13:00:00.000Z	60 \| moderate	14.012 \| fine	53.783 \| good	20.007 \| good	0.559 \| good	11.484 \| good	0.294 \| good
2025-06-07T14:00:00.000Z	66 \| moderate	17.052 \| fine	64.971 \| fine	24.28 \| good	0.656 \| good	11.389 \| good	0.294 \| good
2025-06-07T15:00:00.000Z	67 \| moderate	17.909 \| fine	69.198 \| fine	23.305 \| good	0.594 \| good	9.108 \| good	0.247 \| good
2025-06-07T16:00:00.000Z	66 \| moderate	17.346 \| fine	66.778 \| fine	23.645 \| good	0.638 \| good	14.975 \| good	0.244 \| good
2025-06-07T17:00:00.000Z	66 \| moderate	16.723 \| fine	64.235 \| fine	18.493 \| good	0.827 \| good	20.543 \| good	0.252 \| good
2025-06-07T18:00:00.000Z	64 \| moderate	15.523 \| fine	59.555 \| fine	19.475 \| good	0.758 \| good	16.338 \| good	0.203 \| good
2025-06-07T19:00:00.000Z	58 \| moderate	12.974 \| fine	49.784 \| good	17.967 \| good	0.555 \| good	12.746 \| good	0.199 \| good
2025-06-07T20:00:00.000Z	54 \| moderate	11.466 \| good	43.517 \| good	22.354 \| good	0.58 \| good	11.09 \| good	0.246 \| good
2025-06-07T21:00:00.000Z	52 \| moderate	9.989 \| good	37.726 \| good	21.29 \| good	0.554 \| good	10.926 \| good	0.3 \| good
2025-06-07T20:00:00.000Z	58 \| moderate	12.974 \| fine	49.784 \| good	17.967 \| good	0.555 \| good	12.746 \| good	0.199 \| good
2025-06-07T21:00:00.000Z	30 \| good	5.469 \| good	23.127 \| good	31.584 \| good	1.433 \| good	12.128 \| good	0.275 \| good
2025-06-07T22:00:00.000Z	49 \| good	9.269 \| good	40.956 \| good	34.723 \| good	0.856 \| good	10.017 \| good	0.282 \| good
2025-06-07T23:00:00.000Z	58 \| moderate	12.91 \| fine	58.69 \| fine	36.901 \| good	1.172 \| good	12.733 \| good	0.29 \| good
2025-06-08T00:00:00.000Z	44 \| good	8.463 \| good	36.868 \| good	36.455 \| good	1.489 \| good	15.449 \| good	0.297 \| good
2025-06-08T01:00:00.000Z	52 \| moderate	10.36 \| good	45.774 \| good	31.21 \| good	0.74 \| good	7.876 \| good	0.299 \| good
2025-06-08T02:00:00.000Z	58 \| moderate	12.675 \| fine	56.672 \| fine	30.083 \| good	0.882 \| good	10.01 \| good	0.303 \| good
2025-06-08T03:00:00.000Z	58 \| moderate	13.469 \| fine	60.743 \| fine	31.741 \| good	1.025 \| good	12.144 \| good	0.307 \| good
2025-06-08T04:00:00.000Z	58 \| moderate	13.069 \| fine	58.697 \| fine	33.053 \| good	0.707 \| good	5.771 \| good	0.335 \| good
2025-06-08T05:00:00.000Z	56 \| moderate	12.129 \| fine	54.777 \| good	32.478 \| good	0.897 \| good	7.342 \| good	0.336 \| good
2025-06-08T06:00:00.000Z	56 \| moderate	12.008 \| good	53.892 \| good	29.727 \| good	1.087 \| good	8.912 \| good	0.338 \| good
2025-06-08T07:00:00.000Z	56 \| moderate	11.852 \| good	52.066 \| good	27.988 \| good	0.711 \| good	4.204 \| good	0.323 \| good
2025-06-08T08:00:00.000Z	58 \| moderate	12.876 \| fine	57.046 \| fine	25.754 \| good	0.916 \| good	5.752 \| good	0.331 \| good
2025-06-08T09:00:00.000Z	60 \| moderate	14.222 \| fine	62.97 \| fine	19.866 \| good	1.121 \| good	7.299 \| good	0.34 \| good
2025-06-08T10:00:00.000Z	58 \| moderate	12.917 \| fine	58.825 \| fine	20.318 \| good	0.741 \| good	3.607 \| good	0.32 \| good
2025-06-08T11:00:00.000Z	56 \| moderate	12.103 \| fine	54.804 \| good	21.013 \| good	0.87 \| good	4.444 \| good	0.337 \| good
2025-06-08T12:00:00.000Z	54 \| moderate	11.11 \| good	48.951 \| good	25.528 \| good	0.998 \| good	5.28 \| good	0.354 \| good
2025-06-08T13:00:00.000Z	54 \| moderate	11.181 \| good	49.033 \| good	29.819 \| good	0.716 \| good	2.444 \| good	0.274 \| good
2025-06-08T14:00:00.000Z	56 \| moderate	12.241 \| fine	55.027 \| fine	31.409 \| good	0.779 \| good	2.792 \| good	0.275 \| good
2025-06-08T15:00:00.000Z	58 \| moderate	13.097 \| fine	58.989 \| fine	34.078 \| good	0.842 \| good	3.139 \| good	0.276 \| good
2025-06-08T16:00:00.000Z	62 \| moderate	14.5 \| fine	65 \| fine	34.853 \| good	0.657 \| good	2.082 \| good	0.25 \| good
2025-06-08T17:00:00.000Z	64 \| moderate	16.133 \| fine	71.099 \| fine	34.724 \| good	0.688 \| good	2.291 \| good	0.249 \| good
2025-06-08T18:00:00.000Z	67 \| moderate	17.669 \| fine	78.876 \| fine	35.67 \| good	0.718 \| good	2.5 \| good	0.247 \| good
2025-06-08T19:00:00.000Z	66 \| moderate	16.885 \| fine	74.98 \| fine	37.253 \| good	0.689 \| good	3.604 \| good	0.273 \| good
2025-06-08T20:00:00.000Z	66 \| moderate	17.446 \| fine	76.967 \| fine	35.786 \| good	0.734 \| good	3.998 \| good	0.274 \| good
2025-06-08T21:00:00.000Z	66 \| moderate	16.569 \| fine	73.025 \| fine	34.66 \| good	0.779 \| good	4.392 \| good	0.276 \| good
2025-06-08T22:00:00.000Z	64 \| moderate	16.246 \| fine	72.921 \| fine	35.011 \| good	0.83 \| good	7.296 \| good	0.308 \| good
2025-06-08T23:00:00.000Z	66 \| moderate	17.143 \| fine	76.955 \| fine	31.683 \| good	0.867 \| good	8.644 \| good	0.315 \| good
2025-06-09T00:00:00.000Z	62 \| moderate	14.711 \| fine	64.977 \| fine	26.125 \| good	0.904 \| good	9.992 \| good	0.323 \| good
2025-06-09T01:00:00.000Z	56 \| moderate	12.166 \| fine	54.96 \| good	22.26 \| good	0.855 \| good	9.628 \| good	0.323 \| good
2025-06-09T02:00:00.000Z	49 \| good	9.438 \| good	42.079 \| good	24.678 \| good	0.867 \| good	12.721 \| good	0.344 \| good
2025-06-09T03:00:00.000Z	52 \| moderate	10.053 \| good	45.031 \| good	27.754 \| good	0.878 \| good	15.815 \| good	0.364 \| good
2025-06-09T04:00:00.000Z	54 \| moderate	11.124 \| good	49.008 \| good	30.121 \| good	0.781 \| good	4.71 \| good	0.29 \| good
2025-06-09T05:00:00.000Z	56 \| moderate	11.628 \| good	51.075 \| good	33.331 \| good	0.759 \| good	4.845 \| good	0.291 \| good
2025-06-09T06:00:00.000Z	54 \| moderate	10.544 \| good	46.992 \| good	34.569 \| good	0.737 \| good	4.979 \| good	0.292 \| good
2025-06-09T07:00:00.000Z	52 \| moderate	10.141 \| good	45.015 \| good	33.295 \| good	0.724 \| good	2.673 \| good	0.265 \| good
2025-06-09T08:00:00.000Z	56 \| moderate	11.662 \| good	51.052 \| good	30.868 \| good	0.724 \| good	2.692 \| good	0.263 \| good
2025-06-09T09:00:00.000Z	56 \| moderate	11.942 \| good	53.988 \| good	25.744 \| good	0.724 \| good	2.712 \| good	0.261 \| good
2025-06-09T10:00:00.000Z	54 \| moderate	11.217 \| good	49.984 \| good	25.439 \| good	0.667 \| good	4.268 \| good	0.256 \| good
2025-06-09T11:00:00.000Z	54 \| moderate	11.298 \| good	49.979 \| good	27.862 \| good	0.686 \| good	4.547 \| good	0.253 \| good
2025-06-09T12:00:00.000Z	56 \| moderate	12.323 \| fine	54.967 \| good	28.049 \| good	0.705 \| good	4.826 \| good	0.251 \| good
2025-06-09T13:00:00.000Z	56 \| moderate	11.549 \| good	51.076 \| good	31.188 \| good	0.65 \| good	4.95 \| good	0.212 \| good
2025-06-09T14:00:00.000Z	54 \| moderate	10.664 \| good	46.952 \| good	32.393 \| good	0.681 \| good	5.049 \| good	0.202 \| good
2025-06-09T15:00:00.000Z	52 \| moderate	10.271 \| good	45.001 \| good	34.674 \| good	0.713 \| good	5.148 \| good	0.191 \| good
2025-06-09T16:00:00.000Z	52 \| moderate	10.116 \| good	44.97 \| good	37.521 \| good	0.66 \| good	3.891 \| good	0.168 \| good
2025-06-09T17:00:00.000Z	52 \| moderate	9.969 \| good	44.01 \| good	38.86 \| good	0.679 \| good	3.937 \| good	0.166 \| good
2025-06-09T18:00:00.000Z	52 \| moderate	9.898 \| good	43.955 \| good	38.991 \| good	0.698 \| good	3.983 \| good	0.164 \| good
2025-06-09T19:00:00.000Z	52 \| moderate	10.126 \| good	44.966 \| good	38.952 \| good	0.556 \| good	4.51 \| good	0.21 \| good
2025-06-09T20:00:00.000Z	52 \| moderate	10.192 \| good	44.984 \| good	36.994 \| good	0.589 \| good	4.668 \| good	0.212 \| good

Live air quality index in Watertown, Massachusetts today

Major air pollutants in Watertown, Massachusetts

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

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Brookline, Massachusetts

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Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

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