What is the current concentration of PM10 in Greenwich, Connecticut?

The current PM10 concentration at Greenwich, Connecticut is 3.346 μg/m3.

What is the current concentration of sulfur dioxide (SO2) in Greenwich, Connecticut?

The current sulfur dioxide (SO2) concentration at Greenwich, Connecticut is 0.444 ppb.

What is the current concentration of ozone (O3) in Greenwich, Connecticut?

The current ozone (O3) concentration at Greenwich, Connecticut is 25.166 ppm.

What is the current concentration of nitrogen dioxide (NO2) in Greenwich, Connecticut?

The current nitrogen dioxide (NO2) concentration at Greenwich, Connecticut is 3.189 ppb.

Greenwich, Connecticut live air quality index now

Q: What is the current concentration of PM2.5 in Greenwich, Connecticut?

The current PM2.5 concentration at Greenwich, Connecticut is 0.752 μg/m3.

Stay updated with real-time air quality in Greenwich, Connecticut 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

Greenwich, Connecticut

Last updated: ... (Local time)

Major air pollutants in Greenwich, Connecticut

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

0.75 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

3.35 μg/m³

155

255

425

605+

Ozone (O₃)

25.17 ppb

201

201+

Sulfur Dioxide (SO₂)

0.44 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

3.19 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.24 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Greenwich, Connecticut

Get Live Pollen Counts

Greenwich, Connecticut

Scroll To Air Quality Map

Track live Greenwich, Connecticut air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-09-26T23:00:00.000Z	31 \| good	3.481 \| good	12.183 \| good	33.985 \| good	0.163 \| good	2.287 \| good	0.187 \| good
2026-09-27T00:00:00.000Z	31 \| good	2.785 \| good	12.315 \| good	33.129 \| good	0.17 \| good	2.039 \| good	0.2 \| good
2026-09-27T01:00:00.000Z	31 \| good	3.213 \| good	12.591 \| good	33.111 \| good	0.198 \| good	1.874 \| good	0.2 \| good
2026-09-27T02:00:00.000Z	30 \| good	3.107 \| good	11.125 \| good	32.158 \| good	0.181 \| good	2.386 \| good	0.2 \| good
2026-09-27T03:00:00.000Z	29 \| good	0.655 \| good	2.34 \| good	30.638 \| good	0.128 \| good	1.841 \| good	0.131 \| good
2026-09-27T04:00:00.000Z	30 \| good	2.725 \| good	10.677 \| good	32.465 \| good	0.25 \| good	2.419 \| good	0.2 \| good
2026-09-27T05:00:00.000Z	31 \| good	3.033 \| good	11.417 \| good	33.194 \| good	0.383 \| good	2.344 \| good	0.2 \| good
2026-09-27T06:00:00.000Z	31 \| good	3.218 \| good	14.067 \| good	33.085 \| good	0.404 \| good	5.478 \| good	0.2 \| good
2026-09-27T07:00:00.000Z	30 \| good	2.653 \| good	8.894 \| good	32.462 \| good	0.428 \| good	5.48 \| good	0.21 \| good
2026-09-27T08:00:00.000Z	30 \| good	3.035 \| good	11.089 \| good	32.336 \| good	0.266 \| good	1.18 \| good	0.2 \| good
2026-09-27T09:00:00.000Z	30 \| good	2.94 \| good	11.772 \| good	32.336 \| good	0.273 \| good	1.128 \| good	0.187 \| good
2026-09-27T10:00:00.000Z	31 \| good	2.275 \| good	10.49 \| good	33.21 \| good	0.25 \| good	3.304 \| good	0.187 \| good
2026-09-27T11:00:00.000Z	30 \| good	1.42 \| good	8.087 \| good	32.272 \| good	0.25 \| good	6.302 \| good	0.187 \| good
2026-09-27T12:00:00.000Z	30 \| good	1.43 \| good	9.432 \| good	32.231 \| good	0.312 \| good	3.31 \| good	0.187 \| good
2026-09-27T13:00:00.000Z	30 \| good	5.469 \| good	5.532 \| good	32.315 \| good	0.266 \| good	1.943 \| good	0.187 \| good
2026-09-27T14:00:00.000Z	30 \| good	1.258 \| good	3.402 \| good	32.315 \| good	0.25 \| good	3.088 \| good	0.204 \| good
2026-09-27T15:00:00.000Z	30 \| good	1.302 \| good	3.995 \| good	32.089 \| good	0.274 \| good	3.219 \| good	0.204 \| good
2026-09-27T16:00:00.000Z	29 \| good	0.699 \| good	2.46 \| good	30.631 \| good	0.473 \| good	2.917 \| good	0.204 \| good
2026-09-27T17:00:00.000Z	29 \| good	1.178 \| good	3.765 \| good	30.587 \| good	0.491 \| good	3.468 \| good	0.204 \| good
2026-09-27T18:00:00.000Z	28 \| good	1.748 \| good	4.796 \| good	30.378 \| good	0.478 \| good	4.707 \| good	0.219 \| good
2026-09-27T19:00:00.000Z	28 \| good	1.375 \| good	4.444 \| good	30.256 \| good	0.207 \| good	2.839 \| good	0.242 \| good
2026-09-27T20:00:00.000Z	27 \| good	1.661 \| good	7.091 \| good	29.164 \| good	0.273 \| good	4.52 \| good	0.242 \| good
2026-09-27T21:00:00.000Z	26 \| good	1.239 \| good	2.862 \| good	28.249 \| good	0.25 \| good	6.88 \| good	0.282 \| good
2026-09-27T22:00:00.000Z	25 \| good	0.981 \| good	3.441 \| good	27.357 \| good	0.273 \| good	6.577 \| good	0.265 \| good
2026-09-27T23:00:00.000Z	25 \| good	1.198 \| good	2.747 \| good	27.339 \| good	0.454 \| good	5.068 \| good	0.265 \| good
2026-09-28T00:00:00.000Z	25 \| good	1.206 \| good	5.767 \| good	26.566 \| good	0.517 \| good	5.557 \| good	0.227 \| good
2026-09-28T01:00:00.000Z	25 \| good	1.462 \| good	6.269 \| good	26.503 \| good	0.25 \| good	4.553 \| good	0.227 \| good
2026-09-28T02:00:00.000Z	24 \| good	0.946 \| good	4.752 \| good	25.587 \| good	0.25 \| good	3.869 \| good	0.227 \| good
2026-09-28T03:00:00.000Z	35 \| good	1.973 \| good	7.907 \| good	38.434 \| good	0.252 \| good	5.269 \| good	0.149 \| good
2026-09-28T04:00:00.000Z	25 \| good	1.738 \| good	4.788 \| good	26.587 \| good	0.212 \| good	3.532 \| good	0.187 \| good
2026-09-28T05:00:00.000Z	25 \| good	1.619 \| good	4.443 \| good	26.715 \| good	0.427 \| good	2.641 \| good	0.187 \| good
2026-09-28T06:00:00.000Z	25 \| good	1.212 \| good	5.92 \| good	26.564 \| good	0.251 \| good	2.101 \| good	0.187 \| good
2026-09-28T07:00:00.000Z	25 \| good	0.746 \| good	3.414 \| good	27.478 \| good	0.274 \| good	1.607 \| good	0.186 \| good
2026-09-28T08:00:00.000Z	26 \| good	1.216 \| good	5.361 \| good	27.541 \| good	0.404 \| good	2.34 \| good	0.187 \| good
2026-09-28T09:00:00.000Z	26 \| good	0.569 \| good	3.039 \| good	27.501 \| good	0.55 \| good	2.509 \| good	0.187 \| good
2026-09-28T10:00:00.000Z	26 \| good	0.717 \| good	4.359 \| good	27.501 \| good	0.432 \| good	3.793 \| good	0.185 \| good
2026-09-28T11:00:00.000Z	26 \| good	1.005 \| good	4.951 \| good	27.605 \| good	0.228 \| good	5.394 \| good	0.214 \| good
2026-09-28T12:00:00.000Z	26 \| good	0.617 \| good	4.932 \| good	27.534 \| good	0.385 \| good	7.46 \| good	0.222 \| good
2026-09-28T13:00:00.000Z	25 \| good	0.797 \| good	4.347 \| good	27.49 \| good	0.41 \| good	7.962 \| good	0.257 \| good
2026-09-28T14:00:00.000Z	25 \| good	0.992 \| good	3.951 \| good	27.467 \| good	0.281 \| good	7.711 \| good	0.227 \| good
2026-09-28T15:00:00.000Z	25 \| good	0.962 \| good	3.607 \| good	27.318 \| good	0.235 \| good	8.528 \| good	0.227 \| good
2026-09-28T16:00:00.000Z	25 \| good	1.418 \| good	4.563 \| good	27.239 \| good	0.548 \| good	6.818 \| good	0.259 \| good
2026-09-28T17:00:00.000Z	24 \| good	0.923 \| good	3.858 \| good	26.341 \| good	0.719 \| good	4.777 \| good	0.259 \| good
2026-09-28T18:00:00.000Z	23 \| good	0.97 \| good	3.136 \| good	25.416 \| good	0.428 \| good	4.313 \| good	0.242 \| good
2026-09-28T19:00:00.000Z	23 \| good	0.832 \| good	2.468 \| good	25.294 \| good	0.462 \| good	4.058 \| good	0.209 \| good
2026-09-28T20:00:00.000Z	23 \| good	0.878 \| good	3.641 \| good	25.121 \| good	0.705 \| good	4.152 \| good	0.257 \| good
2026-09-28T21:00:00.000Z	23 \| good	0.752 \| good	3.346 \| good	25.166 \| good	0.444 \| good	3.189 \| good	0.24 \| good
2026-09-28T22:00:00.000Z	22 \| good	0.653 \| good	2.001 \| good	24.124 \| good	0.531 \| good	4.654 \| good	0.28 \| good
2026-09-28T22:00:00.000Z	23 \| good	0.752 \| good	3.346 \| good	25.166 \| good	0.444 \| good	3.189 \| good	0.24 \| good
2026-09-28T23:00:00.000Z	20 \| good	0.646 \| good	2.448 \| good	21.62 \| good	0.257 \| good	6.798 \| good	0.169 \| good
2026-09-29T00:00:00.000Z	23 \| good	1.071 \| good	4.257 \| good	25.229 \| good	0.272 \| good	8.153 \| good	0.172 \| good
2026-09-29T01:00:00.000Z	24 \| good	1.106 \| good	4.555 \| good	25.819 \| good	0.286 \| good	9.306 \| good	0.176 \| good
2026-09-29T02:00:00.000Z	22 \| good	1.085 \| good	4.409 \| good	23.635 \| good	0.303 \| good	10.548 \| good	0.181 \| good
2026-09-29T03:00:00.000Z	20 \| good	1.307 \| good	5.28 \| good	21.99 \| good	0.325 \| good	11.567 \| good	0.191 \| good
2026-09-29T04:00:00.000Z	19 \| good	1.5 \| good	5.877 \| good	21.233 \| good	0.337 \| good	12.098 \| good	0.2 \| good
2026-09-29T05:00:00.000Z	17 \| good	1.312 \| good	5.55 \| good	18.065 \| good	0.342 \| good	12.434 \| good	0.207 \| good
2026-09-29T06:00:00.000Z	15 \| good	1.514 \| good	6.127 \| good	15.741 \| good	0.353 \| good	12.735 \| good	0.21 \| good
2026-09-29T07:00:00.000Z	14 \| good	1.472 \| good	6.032 \| good	15.086 \| good	0.365 \| good	12.916 \| good	0.211 \| good
2026-09-29T08:00:00.000Z	13 \| good	1.452 \| good	5.855 \| good	13.726 \| good	0.374 \| good	13.155 \| good	0.209 \| good
2026-09-29T09:00:00.000Z	12 \| good	1.713 \| good	7.195 \| good	9.88 \| good	0.386 \| good	13.415 \| good	0.207 \| good
2026-09-29T10:00:00.000Z	13 \| good	1.888 \| good	7.714 \| good	8.557 \| good	0.396 \| good	13.553 \| good	0.207 \| good
2026-09-29T11:00:00.000Z	16 \| good	3.288 \| good	13.955 \| good	7.048 \| good	0.418 \| good	13.423 \| good	0.214 \| good
2026-09-29T12:00:00.000Z	11 \| good	2.115 \| good	8.612 \| good	10.138 \| good	0.452 \| good	12.294 \| good	0.23 \| good
2026-09-29T13:00:00.000Z	16 \| good	2.549 \| good	10.324 \| good	16.609 \| good	0.453 \| good	9.137 \| good	0.215 \| good
2026-09-29T14:00:00.000Z	21 \| good	2.321 \| good	9.586 \| good	23.226 \| good	0.461 \| good	6.364 \| good	0.193 \| good
2026-09-29T15:00:00.000Z	26 \| good	2.049 \| good	8.604 \| good	28.182 \| good	0.453 \| good	4.929 \| good	0.177 \| good
2026-09-29T16:00:00.000Z	31 \| good	2.836 \| good	11.905 \| good	33.712 \| good	0.454 \| good	4.493 \| good	0.17 \| good
2026-09-29T17:00:00.000Z	32 \| good	3.157 \| good	13.375 \| good	34.998 \| good	0.463 \| good	4.354 \| good	0.168 \| good
2026-09-29T18:00:00.000Z	30 \| good	3.375 \| good	14.522 \| good	32.139 \| good	0.455 \| good	3.655 \| good	0.163 \| good
2026-09-29T19:00:00.000Z	29 \| good	3.194 \| good	13.702 \| good	31.093 \| good	0.435 \| good	3.392 \| good	0.161 \| good
2026-09-29T20:00:00.000Z	30 \| good	2.102 \| good	8.917 \| good	31.659 \| good	0.436 \| good	3.576 \| good	0.162 \| good
2026-09-29T21:00:00.000Z	28 \| good	2.578 \| good	10.729 \| good	29.647 \| good	0.437 \| good	4.207 \| good	0.165 \| good
2026-09-29T22:00:00.000Z	23 \| good	3.226 \| good	13.613 \| good	25.304 \| good	0.462 \| good	8.316 \| good	0.194 \| good
2026-09-29T23:00:00.000Z	23 \| good	2.934 \| good	12.515 \| good	24.638 \| good	0.515 \| good	12.744 \| good	0.23 \| good
2026-09-30T00:00:00.000Z	25 \| good	2.649 \| good	11.212 \| good	27.453 \| good	0.57 \| good	14.835 \| good	0.252 \| good
2026-09-30T01:00:00.000Z	26 \| good	1.715 \| good	6.917 \| good	27.673 \| good	0.592 \| good	16.302 \| good	0.262 \| good
2026-09-30T02:00:00.000Z	23 \| good	1.828 \| good	7.305 \| good	25.092 \| good	0.589 \| good	16.622 \| good	0.261 \| good
2026-09-30T03:00:00.000Z	22 \| good	3.574 \| good	15.631 \| good	22.362 \| good	0.564 \| good	15.859 \| good	0.251 \| good
2026-09-30T04:00:00.000Z	22 \| good	3.406 \| good	14.761 \| good	23.766 \| good	0.519 \| good	14.825 \| good	0.239 \| good
2026-09-30T05:00:00.000Z	20 \| good	3.178 \| good	13.637 \| good	22.067 \| good	0.487 \| good	13.93 \| good	0.226 \| good
2026-09-30T06:00:00.000Z	19 \| good	2.773 \| good	11.515 \| good	21.05 \| good	0.473 \| good	13.511 \| good	0.22 \| good
2026-09-30T07:00:00.000Z	17 \| good	2.858 \| good	12.01 \| good	18.465 \| good	0.469 \| good	13.369 \| good	0.216 \| good
2026-09-30T08:00:00.000Z	17 \| good	2.578 \| good	10.669 \| good	18.416 \| good	0.469 \| good	13.15 \| good	0.213 \| good
2026-09-30T09:00:00.000Z	16 \| good	3.391 \| good	14.57 \| good	14.851 \| good	0.473 \| good	12.732 \| good	0.207 \| good
2026-09-30T10:00:00.000Z	14 \| good	2.461 \| good	10.297 \| good	14.911 \| good	0.482 \| good	12.553 \| good	0.206 \| good
2026-09-30T11:00:00.000Z	22 \| good	3.58 \| good	15.681 \| good	14.083 \| good	0.512 \| good	12.203 \| good	0.218 \| good
2026-09-30T12:00:00.000Z	22 \| good	3.615 \| good	15.785 \| good	19.536 \| good	0.541 \| good	10.103 \| good	0.242 \| good
2026-09-30T13:00:00.000Z	22 \| good	3.177 \| good	13.582 \| good	23.954 \| good	0.578 \| good	7.64 \| good	0.224 \| good
2026-09-30T14:00:00.000Z	27 \| good	2.515 \| good	10.654 \| good	28.602 \| good	0.666 \| good	5.65 \| good	0.201 \| good
2026-09-30T15:00:00.000Z	31 \| good	3.488 \| good	15.138 \| good	32.722 \| good	0.712 \| good	4.176 \| good	0.183 \| good
2026-09-30T16:00:00.000Z	35 \| good	3.135 \| good	13.166 \| good	38.097 \| good	0.638 \| good	3.768 \| good	0.172 \| good
2026-09-30T17:00:00.000Z	40 \| good	4.519 \| good	19.56 \| good	43.297 \| good	0.577 \| good	4.213 \| good	0.172 \| good
2026-09-30T18:00:00.000Z	42 \| good	4.633 \| good	19.989 \| good	44.633 \| good	0.538 \| good	4.951 \| good	0.172 \| good
2026-09-30T19:00:00.000Z	44 \| good	6.636 \| good	28.978 \| good	46.986 \| good	0.515 \| good	5.96 \| good	0.174 \| good
2026-09-30T20:00:00.000Z	44 \| good	5.414 \| good	23.732 \| good	48.333 \| good	0.492 \| good	6.819 \| good	0.176 \| good
2026-09-30T21:00:00.000Z	43 \| good	6.58 \| good	29.049 \| good	45.569 \| good	0.491 \| good	8.646 \| good	0.187 \| good
2026-09-30T22:00:00.000Z	44 \| good	7.813 \| good	34.835 \| good	42.958 \| good	0.567 \| good	18.206 \| good	0.258 \| good

Greenwich

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Greenwich, Connecticut air quality map: Track AQI near you

0.25ppm

How accurate is Connecticut, USA air quality data?

Air quality data and pollutant measurements for Connecticut, 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 Greenwich, Connecticut updated?

The air quality for Greenwich, Connecticut is updated every hour.

When was the worst air quality at Greenwich, Connecticut in the last 24 hrs?

The worst air quality in Greenwich, Connecticut in the last 24 hours was observed at 03:00:00 on 2026-09-28.

When was the best air quality at Greenwich, Connecticut in the last 24 hrs?

In the last 24 hrs, the best air quality in Greenwich, Connecticut was observed at 09:00:00 on 2026-09-28.

What is the current air quality in Greenwich, Connecticut?

The current air quality in Greenwich, Connecticut is 23, categorized as Good based on real-time data.

What pollutant is the most common in Greenwich, Connecticut?

The most common pollutant in Greenwich, Connecticut is O3.

What should I do if the air quality in Greenwich, Connecticut is poor?

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

What is the current concentration of PM_2.5 in Greenwich, Connecticut?

The current PM_2.5 concentration at Greenwich, Connecticut is 0.752 μg/m³.

What is the current concentration of PM₁₀ in Greenwich, Connecticut?

The current PM₁₀ concentration at Greenwich, Connecticut is 3.346 μg/m³.

What is the current concentration of carbon monoxide (CO) in Greenwich, Connecticut?

The current carbon monoxide (CO) concentration at Greenwich, Connecticut is 0.24 ppm.

What is the current concentration of sulfur dioxide (SO₂) in Greenwich, Connecticut?

The current sulfur dioxide (SO₂) concentration at Greenwich, Connecticut is 0.444 ppb.

What is the current concentration of ozone (O₃) in Greenwich, Connecticut?

The current ozone (O₃) concentration at Greenwich, Connecticut is 25.166 ppm.

What is the current concentration of nitrogen dioxide (NO₂) in Greenwich, Connecticut?

The current nitrogen dioxide (NO₂) concentration at Greenwich, Connecticut is 3.189 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-09-26T23:00:00.000Z	31 \| good	3.481 \| good	12.183 \| good	33.985 \| good	0.163 \| good	2.287 \| good	0.187 \| good
2026-09-27T00:00:00.000Z	31 \| good	2.785 \| good	12.315 \| good	33.129 \| good	0.17 \| good	2.039 \| good	0.2 \| good
2026-09-27T01:00:00.000Z	31 \| good	3.213 \| good	12.591 \| good	33.111 \| good	0.198 \| good	1.874 \| good	0.2 \| good
2026-09-27T02:00:00.000Z	30 \| good	3.107 \| good	11.125 \| good	32.158 \| good	0.181 \| good	2.386 \| good	0.2 \| good
2026-09-27T03:00:00.000Z	29 \| good	0.655 \| good	2.34 \| good	30.638 \| good	0.128 \| good	1.841 \| good	0.131 \| good
2026-09-27T04:00:00.000Z	30 \| good	2.725 \| good	10.677 \| good	32.465 \| good	0.25 \| good	2.419 \| good	0.2 \| good
2026-09-27T05:00:00.000Z	31 \| good	3.033 \| good	11.417 \| good	33.194 \| good	0.383 \| good	2.344 \| good	0.2 \| good
2026-09-27T06:00:00.000Z	31 \| good	3.218 \| good	14.067 \| good	33.085 \| good	0.404 \| good	5.478 \| good	0.2 \| good
2026-09-27T07:00:00.000Z	30 \| good	2.653 \| good	8.894 \| good	32.462 \| good	0.428 \| good	5.48 \| good	0.21 \| good
2026-09-27T08:00:00.000Z	30 \| good	3.035 \| good	11.089 \| good	32.336 \| good	0.266 \| good	1.18 \| good	0.2 \| good
2026-09-27T09:00:00.000Z	30 \| good	2.94 \| good	11.772 \| good	32.336 \| good	0.273 \| good	1.128 \| good	0.187 \| good
2026-09-27T10:00:00.000Z	31 \| good	2.275 \| good	10.49 \| good	33.21 \| good	0.25 \| good	3.304 \| good	0.187 \| good
2026-09-27T11:00:00.000Z	30 \| good	1.42 \| good	8.087 \| good	32.272 \| good	0.25 \| good	6.302 \| good	0.187 \| good
2026-09-27T12:00:00.000Z	30 \| good	1.43 \| good	9.432 \| good	32.231 \| good	0.312 \| good	3.31 \| good	0.187 \| good
2026-09-27T13:00:00.000Z	30 \| good	5.469 \| good	5.532 \| good	32.315 \| good	0.266 \| good	1.943 \| good	0.187 \| good
2026-09-27T14:00:00.000Z	30 \| good	1.258 \| good	3.402 \| good	32.315 \| good	0.25 \| good	3.088 \| good	0.204 \| good
2026-09-27T15:00:00.000Z	30 \| good	1.302 \| good	3.995 \| good	32.089 \| good	0.274 \| good	3.219 \| good	0.204 \| good
2026-09-27T16:00:00.000Z	29 \| good	0.699 \| good	2.46 \| good	30.631 \| good	0.473 \| good	2.917 \| good	0.204 \| good
2026-09-27T17:00:00.000Z	29 \| good	1.178 \| good	3.765 \| good	30.587 \| good	0.491 \| good	3.468 \| good	0.204 \| good
2026-09-27T18:00:00.000Z	28 \| good	1.748 \| good	4.796 \| good	30.378 \| good	0.478 \| good	4.707 \| good	0.219 \| good
2026-09-27T19:00:00.000Z	28 \| good	1.375 \| good	4.444 \| good	30.256 \| good	0.207 \| good	2.839 \| good	0.242 \| good
2026-09-27T20:00:00.000Z	27 \| good	1.661 \| good	7.091 \| good	29.164 \| good	0.273 \| good	4.52 \| good	0.242 \| good
2026-09-27T21:00:00.000Z	26 \| good	1.239 \| good	2.862 \| good	28.249 \| good	0.25 \| good	6.88 \| good	0.282 \| good
2026-09-27T22:00:00.000Z	25 \| good	0.981 \| good	3.441 \| good	27.357 \| good	0.273 \| good	6.577 \| good	0.265 \| good
2026-09-27T23:00:00.000Z	25 \| good	1.198 \| good	2.747 \| good	27.339 \| good	0.454 \| good	5.068 \| good	0.265 \| good
2026-09-28T00:00:00.000Z	25 \| good	1.206 \| good	5.767 \| good	26.566 \| good	0.517 \| good	5.557 \| good	0.227 \| good
2026-09-28T01:00:00.000Z	25 \| good	1.462 \| good	6.269 \| good	26.503 \| good	0.25 \| good	4.553 \| good	0.227 \| good
2026-09-28T02:00:00.000Z	24 \| good	0.946 \| good	4.752 \| good	25.587 \| good	0.25 \| good	3.869 \| good	0.227 \| good
2026-09-28T03:00:00.000Z	35 \| good	1.973 \| good	7.907 \| good	38.434 \| good	0.252 \| good	5.269 \| good	0.149 \| good
2026-09-28T04:00:00.000Z	25 \| good	1.738 \| good	4.788 \| good	26.587 \| good	0.212 \| good	3.532 \| good	0.187 \| good
2026-09-28T05:00:00.000Z	25 \| good	1.619 \| good	4.443 \| good	26.715 \| good	0.427 \| good	2.641 \| good	0.187 \| good
2026-09-28T06:00:00.000Z	25 \| good	1.212 \| good	5.92 \| good	26.564 \| good	0.251 \| good	2.101 \| good	0.187 \| good
2026-09-28T07:00:00.000Z	25 \| good	0.746 \| good	3.414 \| good	27.478 \| good	0.274 \| good	1.607 \| good	0.186 \| good
2026-09-28T08:00:00.000Z	26 \| good	1.216 \| good	5.361 \| good	27.541 \| good	0.404 \| good	2.34 \| good	0.187 \| good
2026-09-28T09:00:00.000Z	26 \| good	0.569 \| good	3.039 \| good	27.501 \| good	0.55 \| good	2.509 \| good	0.187 \| good
2026-09-28T10:00:00.000Z	26 \| good	0.717 \| good	4.359 \| good	27.501 \| good	0.432 \| good	3.793 \| good	0.185 \| good
2026-09-28T11:00:00.000Z	26 \| good	1.005 \| good	4.951 \| good	27.605 \| good	0.228 \| good	5.394 \| good	0.214 \| good
2026-09-28T12:00:00.000Z	26 \| good	0.617 \| good	4.932 \| good	27.534 \| good	0.385 \| good	7.46 \| good	0.222 \| good
2026-09-28T13:00:00.000Z	25 \| good	0.797 \| good	4.347 \| good	27.49 \| good	0.41 \| good	7.962 \| good	0.257 \| good
2026-09-28T14:00:00.000Z	25 \| good	0.992 \| good	3.951 \| good	27.467 \| good	0.281 \| good	7.711 \| good	0.227 \| good
2026-09-28T15:00:00.000Z	25 \| good	0.962 \| good	3.607 \| good	27.318 \| good	0.235 \| good	8.528 \| good	0.227 \| good
2026-09-28T16:00:00.000Z	25 \| good	1.418 \| good	4.563 \| good	27.239 \| good	0.548 \| good	6.818 \| good	0.259 \| good
2026-09-28T17:00:00.000Z	24 \| good	0.923 \| good	3.858 \| good	26.341 \| good	0.719 \| good	4.777 \| good	0.259 \| good
2026-09-28T18:00:00.000Z	23 \| good	0.97 \| good	3.136 \| good	25.416 \| good	0.428 \| good	4.313 \| good	0.242 \| good
2026-09-28T19:00:00.000Z	23 \| good	0.832 \| good	2.468 \| good	25.294 \| good	0.462 \| good	4.058 \| good	0.209 \| good
2026-09-28T20:00:00.000Z	23 \| good	0.878 \| good	3.641 \| good	25.121 \| good	0.705 \| good	4.152 \| good	0.257 \| good
2026-09-28T21:00:00.000Z	23 \| good	0.752 \| good	3.346 \| good	25.166 \| good	0.444 \| good	3.189 \| good	0.24 \| good
2026-09-28T22:00:00.000Z	22 \| good	0.653 \| good	2.001 \| good	24.124 \| good	0.531 \| good	4.654 \| good	0.28 \| good
2026-09-28T22:00:00.000Z	23 \| good	0.752 \| good	3.346 \| good	25.166 \| good	0.444 \| good	3.189 \| good	0.24 \| good
2026-09-28T23:00:00.000Z	20 \| good	0.646 \| good	2.448 \| good	21.62 \| good	0.257 \| good	6.798 \| good	0.169 \| good
2026-09-29T00:00:00.000Z	23 \| good	1.071 \| good	4.257 \| good	25.229 \| good	0.272 \| good	8.153 \| good	0.172 \| good
2026-09-29T01:00:00.000Z	24 \| good	1.106 \| good	4.555 \| good	25.819 \| good	0.286 \| good	9.306 \| good	0.176 \| good
2026-09-29T02:00:00.000Z	22 \| good	1.085 \| good	4.409 \| good	23.635 \| good	0.303 \| good	10.548 \| good	0.181 \| good
2026-09-29T03:00:00.000Z	20 \| good	1.307 \| good	5.28 \| good	21.99 \| good	0.325 \| good	11.567 \| good	0.191 \| good
2026-09-29T04:00:00.000Z	19 \| good	1.5 \| good	5.877 \| good	21.233 \| good	0.337 \| good	12.098 \| good	0.2 \| good
2026-09-29T05:00:00.000Z	17 \| good	1.312 \| good	5.55 \| good	18.065 \| good	0.342 \| good	12.434 \| good	0.207 \| good
2026-09-29T06:00:00.000Z	15 \| good	1.514 \| good	6.127 \| good	15.741 \| good	0.353 \| good	12.735 \| good	0.21 \| good
2026-09-29T07:00:00.000Z	14 \| good	1.472 \| good	6.032 \| good	15.086 \| good	0.365 \| good	12.916 \| good	0.211 \| good
2026-09-29T08:00:00.000Z	13 \| good	1.452 \| good	5.855 \| good	13.726 \| good	0.374 \| good	13.155 \| good	0.209 \| good
2026-09-29T09:00:00.000Z	12 \| good	1.713 \| good	7.195 \| good	9.88 \| good	0.386 \| good	13.415 \| good	0.207 \| good
2026-09-29T10:00:00.000Z	13 \| good	1.888 \| good	7.714 \| good	8.557 \| good	0.396 \| good	13.553 \| good	0.207 \| good
2026-09-29T11:00:00.000Z	16 \| good	3.288 \| good	13.955 \| good	7.048 \| good	0.418 \| good	13.423 \| good	0.214 \| good
2026-09-29T12:00:00.000Z	11 \| good	2.115 \| good	8.612 \| good	10.138 \| good	0.452 \| good	12.294 \| good	0.23 \| good
2026-09-29T13:00:00.000Z	16 \| good	2.549 \| good	10.324 \| good	16.609 \| good	0.453 \| good	9.137 \| good	0.215 \| good
2026-09-29T14:00:00.000Z	21 \| good	2.321 \| good	9.586 \| good	23.226 \| good	0.461 \| good	6.364 \| good	0.193 \| good
2026-09-29T15:00:00.000Z	26 \| good	2.049 \| good	8.604 \| good	28.182 \| good	0.453 \| good	4.929 \| good	0.177 \| good
2026-09-29T16:00:00.000Z	31 \| good	2.836 \| good	11.905 \| good	33.712 \| good	0.454 \| good	4.493 \| good	0.17 \| good
2026-09-29T17:00:00.000Z	32 \| good	3.157 \| good	13.375 \| good	34.998 \| good	0.463 \| good	4.354 \| good	0.168 \| good
2026-09-29T18:00:00.000Z	30 \| good	3.375 \| good	14.522 \| good	32.139 \| good	0.455 \| good	3.655 \| good	0.163 \| good
2026-09-29T19:00:00.000Z	29 \| good	3.194 \| good	13.702 \| good	31.093 \| good	0.435 \| good	3.392 \| good	0.161 \| good
2026-09-29T20:00:00.000Z	30 \| good	2.102 \| good	8.917 \| good	31.659 \| good	0.436 \| good	3.576 \| good	0.162 \| good
2026-09-29T21:00:00.000Z	28 \| good	2.578 \| good	10.729 \| good	29.647 \| good	0.437 \| good	4.207 \| good	0.165 \| good
2026-09-29T22:00:00.000Z	23 \| good	3.226 \| good	13.613 \| good	25.304 \| good	0.462 \| good	8.316 \| good	0.194 \| good
2026-09-29T23:00:00.000Z	23 \| good	2.934 \| good	12.515 \| good	24.638 \| good	0.515 \| good	12.744 \| good	0.23 \| good
2026-09-30T00:00:00.000Z	25 \| good	2.649 \| good	11.212 \| good	27.453 \| good	0.57 \| good	14.835 \| good	0.252 \| good
2026-09-30T01:00:00.000Z	26 \| good	1.715 \| good	6.917 \| good	27.673 \| good	0.592 \| good	16.302 \| good	0.262 \| good
2026-09-30T02:00:00.000Z	23 \| good	1.828 \| good	7.305 \| good	25.092 \| good	0.589 \| good	16.622 \| good	0.261 \| good
2026-09-30T03:00:00.000Z	22 \| good	3.574 \| good	15.631 \| good	22.362 \| good	0.564 \| good	15.859 \| good	0.251 \| good
2026-09-30T04:00:00.000Z	22 \| good	3.406 \| good	14.761 \| good	23.766 \| good	0.519 \| good	14.825 \| good	0.239 \| good
2026-09-30T05:00:00.000Z	20 \| good	3.178 \| good	13.637 \| good	22.067 \| good	0.487 \| good	13.93 \| good	0.226 \| good
2026-09-30T06:00:00.000Z	19 \| good	2.773 \| good	11.515 \| good	21.05 \| good	0.473 \| good	13.511 \| good	0.22 \| good
2026-09-30T07:00:00.000Z	17 \| good	2.858 \| good	12.01 \| good	18.465 \| good	0.469 \| good	13.369 \| good	0.216 \| good
2026-09-30T08:00:00.000Z	17 \| good	2.578 \| good	10.669 \| good	18.416 \| good	0.469 \| good	13.15 \| good	0.213 \| good
2026-09-30T09:00:00.000Z	16 \| good	3.391 \| good	14.57 \| good	14.851 \| good	0.473 \| good	12.732 \| good	0.207 \| good
2026-09-30T10:00:00.000Z	14 \| good	2.461 \| good	10.297 \| good	14.911 \| good	0.482 \| good	12.553 \| good	0.206 \| good
2026-09-30T11:00:00.000Z	22 \| good	3.58 \| good	15.681 \| good	14.083 \| good	0.512 \| good	12.203 \| good	0.218 \| good
2026-09-30T12:00:00.000Z	22 \| good	3.615 \| good	15.785 \| good	19.536 \| good	0.541 \| good	10.103 \| good	0.242 \| good
2026-09-30T13:00:00.000Z	22 \| good	3.177 \| good	13.582 \| good	23.954 \| good	0.578 \| good	7.64 \| good	0.224 \| good
2026-09-30T14:00:00.000Z	27 \| good	2.515 \| good	10.654 \| good	28.602 \| good	0.666 \| good	5.65 \| good	0.201 \| good
2026-09-30T15:00:00.000Z	31 \| good	3.488 \| good	15.138 \| good	32.722 \| good	0.712 \| good	4.176 \| good	0.183 \| good
2026-09-30T16:00:00.000Z	35 \| good	3.135 \| good	13.166 \| good	38.097 \| good	0.638 \| good	3.768 \| good	0.172 \| good
2026-09-30T17:00:00.000Z	40 \| good	4.519 \| good	19.56 \| good	43.297 \| good	0.577 \| good	4.213 \| good	0.172 \| good
2026-09-30T18:00:00.000Z	42 \| good	4.633 \| good	19.989 \| good	44.633 \| good	0.538 \| good	4.951 \| good	0.172 \| good
2026-09-30T19:00:00.000Z	44 \| good	6.636 \| good	28.978 \| good	46.986 \| good	0.515 \| good	5.96 \| good	0.174 \| good
2026-09-30T20:00:00.000Z	44 \| good	5.414 \| good	23.732 \| good	48.333 \| good	0.492 \| good	6.819 \| good	0.176 \| good
2026-09-30T21:00:00.000Z	43 \| good	6.58 \| good	29.049 \| good	45.569 \| good	0.491 \| good	8.646 \| good	0.187 \| good
2026-09-30T22:00:00.000Z	44 \| good	7.813 \| good	34.835 \| good	42.958 \| good	0.567 \| good	18.206 \| good	0.258 \| good

Greenwich, Connecticut live air quality index now

Major air pollutants in Greenwich, Connecticut

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

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Greenwich, Connecticut air quality map: Track AQI near you

Air quality in nearby cities

Port Chester, New York

Rye, New York

Stamford, Connecticut

Harrison, New York

White Plains, New York

Mamaroneck, New York

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Frequently asked questions

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What is the current concentration of PM10 in Greenwich, Connecticut?

What is the current concentration of carbon monoxide (CO) in Greenwich, Connecticut?

What is the current concentration of sulfur dioxide (SO2) in Greenwich, Connecticut?

What is the current concentration of ozone (O3) in Greenwich, Connecticut?

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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 current concentration of PM_2.5 in Greenwich, Connecticut?

What is the current concentration of PM₁₀ in Greenwich, Connecticut?

What is the current concentration of sulfur dioxide (SO₂) in Greenwich, Connecticut?

What is the current concentration of ozone (O₃) in Greenwich, Connecticut?

What is the current concentration of nitrogen dioxide (NO₂) in Greenwich, Connecticut?