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

The current PM10 concentration at Greenwich, Connecticut is 17.975 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Greenwich, Connecticut is 0.309 ppb.

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

The current ozone (O3) concentration at Greenwich, Connecticut is 43.929 ppm.

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

The current nitrogen dioxide (NO2) concentration at Greenwich, Connecticut is 5.905 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 4.977 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)

4.98 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

17.98 μg/m³

155

255

425

605+

Ozone (O₃)

43.93 ppb

201

201+

Sulfur Dioxide (SO₂)

0.31 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

5.91 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.26 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

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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
2026-03-27T23:00:00.000Z	35 \| good	2.572 \| good	12.641 \| good	38.468 \| good	0.22 \| good	5.653 \| good	0.25 \| good
2026-03-28T00:00:00.000Z	37 \| good	3.173 \| good	13.887 \| good	39.509 \| good	0.183 \| good	5.805 \| good	0.25 \| good
2026-03-28T01:00:00.000Z	35 \| good	3.194 \| good	8.799 \| good	38.077 \| good	0.197 \| good	5.783 \| good	0.25 \| good
2026-03-28T02:00:00.000Z	35 \| good	3.309 \| good	13.365 \| good	37.741 \| good	0.197 \| good	9.204 \| good	0.281 \| good
2026-03-28T03:00:00.000Z	30 \| good	3.466 \| good	15.45 \| good	31.529 \| good	0.17 \| good	11.888 \| good	0.351 \| good
2026-03-28T04:00:00.000Z	30 \| good	3.802 \| good	16.74 \| good	31.529 \| good	0.207 \| good	9.524 \| good	0.28 \| good
2026-03-28T05:00:00.000Z	27 \| good	4.152 \| good	14.665 \| good	28.715 \| good	0.156 \| good	7.782 \| good	0.28 \| good
2026-03-28T06:00:00.000Z	25 \| good	3.98 \| good	16.375 \| good	26.739 \| good	0.192 \| good	7.594 \| good	0.269 \| good
2026-03-28T07:00:00.000Z	28 \| good	3.612 \| good	15.23 \| good	30.37 \| good	0.212 \| good	6.478 \| good	0.211 \| good
2026-03-28T08:00:00.000Z	27 \| good	3.557 \| good	15.335 \| good	29.038 \| good	0.198 \| good	5.99 \| good	0.21 \| good
2026-03-28T09:00:00.000Z	27 \| good	3.494 \| good	14.302 \| good	28.933 \| good	0.209 \| good	7.211 \| good	0.21 \| good
2026-03-28T10:00:00.000Z	27 \| good	4.042 \| good	18.153 \| good	29.449 \| good	0.172 \| good	5.187 \| good	0.21 \| good
2026-03-28T11:00:00.000Z	30 \| good	4.482 \| good	14.665 \| good	31.902 \| good	0.154 \| good	5.843 \| good	0.218 \| good
2026-03-28T12:00:00.000Z	29 \| good	4.206 \| good	16.684 \| good	31.397 \| good	0.185 \| good	4.438 \| good	0.25 \| good
2026-03-28T13:00:00.000Z	33 \| good	4.809 \| good	17.401 \| good	35.646 \| good	0.202 \| good	4.417 \| good	0.269 \| good
2026-03-28T14:00:00.000Z	34 \| good	4.91 \| good	20.021 \| good	37.48 \| good	0.194 \| good	2.244 \| good	0.265 \| good
2026-03-28T15:00:00.000Z	36 \| good	4.264 \| good	17.452 \| good	38.668 \| good	0.157 \| good	2.06 \| good	0.233 \| good
2026-03-28T16:00:00.000Z	35 \| good	4.433 \| good	18.421 \| good	38.153 \| good	0.184 \| good	1.786 \| good	0.218 \| good
2026-03-28T17:00:00.000Z	37 \| good	4.264 \| good	22.479 \| good	39.811 \| good	0.2 \| good	1.369 \| good	0.218 \| good
2026-03-28T18:00:00.000Z	36 \| good	3.933 \| good	17.944 \| good	39.421 \| good	0.152 \| good	1.853 \| good	0.218 \| good
2026-03-28T19:00:00.000Z	38 \| good	2.97 \| good	9.555 \| good	41.35 \| good	0.154 \| good	1.692 \| good	0.218 \| good
2026-03-28T20:00:00.000Z	40 \| good	2.962 \| good	14.036 \| good	42.676 \| good	0.155 \| good	2.346 \| good	0.218 \| good
2026-03-28T21:00:00.000Z	39 \| good	3.426 \| good	12.238 \| good	41.57 \| good	0.146 \| good	2.34 \| good	0.233 \| good
2026-03-28T22:00:00.000Z	38 \| good	3.113 \| good	8.879 \| good	40.66 \| good	0.132 \| good	2.158 \| good	0.233 \| good
2026-03-28T23:00:00.000Z	39 \| good	3.878 \| good	16.25 \| good	41.611 \| good	0.138 \| good	3.032 \| good	0.218 \| good
2026-03-29T00:00:00.000Z	39 \| good	3.674 \| good	16.509 \| good	42.172 \| good	0.17 \| good	5.625 \| good	0.218 \| good
2026-03-29T01:00:00.000Z	38 \| good	5.13 \| good	16.425 \| good	40.875 \| good	0.201 \| good	8.961 \| good	0.282 \| good
2026-03-29T02:00:00.000Z	36 \| good	4.011 \| good	18.353 \| good	38.943 \| good	0.151 \| good	11.576 \| good	0.313 \| good
2026-03-29T03:00:00.000Z	23 \| good	4.178 \| good	18.135 \| good	25.178 \| good	1.119 \| good	13.706 \| good	0.238 \| good
2026-03-29T04:00:00.000Z	34 \| good	5.054 \| good	16.924 \| good	36.509 \| good	0.184 \| good	22.768 \| good	0.337 \| good
2026-03-29T05:00:00.000Z	33 \| good	5.684 \| good	17.745 \| good	30.246 \| good	0.259 \| good	22.887 \| good	0.305 \| good
2026-03-29T06:00:00.000Z	28 \| good	5.292 \| good	14.24 \| good	30.005 \| good	0.259 \| good	21.806 \| good	0.305 \| good
2026-03-29T07:00:00.000Z	33 \| good	5.79 \| good	23.893 \| good	21.586 \| good	0.392 \| good	28.591 \| good	0.306 \| good
2026-03-29T08:00:00.000Z	33 \| good	6.306 \| good	18.729 \| good	14.713 \| good	0.299 \| good	23.784 \| good	0.356 \| good
2026-03-29T09:00:00.000Z	33 \| good	5.759 \| good	16.07 \| good	10.246 \| good	0.468 \| good	28.164 \| good	0.371 \| good
2026-03-29T10:00:00.000Z	38 \| good	6.752 \| good	28.909 \| good	7.792 \| good	0.476 \| good	32.214 \| good	0.354 \| good
2026-03-29T11:00:00.000Z	29 \| good	5.281 \| good	21.931 \| good	4.463 \| good	0.763 \| good	31.216 \| good	0.424 \| good
2026-03-29T12:00:00.000Z	38 \| good	6.549 \| good	26.84 \| good	6.068 \| good	0.744 \| good	29.455 \| good	0.481 \| good
2026-03-29T13:00:00.000Z	38 \| good	7.068 \| good	32.49 \| good	6.886 \| good	0.74 \| good	31.15 \| good	0.487 \| good
2026-03-29T14:00:00.000Z	33 \| good	5.849 \| good	25.742 \| good	9.833 \| good	0.636 \| good	14.117 \| good	0.273 \| good
2026-03-29T15:00:00.000Z	27 \| good	5.297 \| good	21.987 \| good	19.176 \| good	0.601 \| good	7.071 \| good	0.242 \| good
2026-03-29T16:00:00.000Z	24 \| good	4.5 \| good	18.76 \| good	25.97 \| good	0.508 \| good	5.766 \| good	0.26 \| good
2026-03-29T17:00:00.000Z	32 \| good	4.43 \| good	16.847 \| good	35.048 \| good	0.46 \| good	8.275 \| good	0.284 \| good
2026-03-29T18:00:00.000Z	33 \| good	5.57 \| good	23.552 \| good	36 \| good	0.387 \| good	6.09 \| good	0.255 \| good
2026-03-29T19:00:00.000Z	38 \| good	5.452 \| good	23.34 \| good	41.002 \| good	0.346 \| good	6.041 \| good	0.255 \| good
2026-03-29T20:00:00.000Z	41 \| good	5.282 \| good	20.165 \| good	43.631 \| good	0.336 \| good	6.057 \| good	0.255 \| good
2026-03-29T21:00:00.000Z	41 \| good	4.977 \| good	17.975 \| good	43.929 \| good	0.309 \| good	5.905 \| good	0.255 \| good
2026-03-29T22:00:00.000Z	41 \| good	4.977 \| good	17.975 \| good	43.929 \| good	0.309 \| good	5.905 \| good	0.255 \| good
2026-03-29T23:00:00.000Z	44 \| good	8.023 \| good	35.087 \| good	35.438 \| good	2.121 \| good	13.049 \| good	0.218 \| good
2026-03-30T00:00:00.000Z	54 \| moderate	11.431 \| good	50.478 \| good	28.137 \| good	1.996 \| good	16.123 \| good	0.23 \| good
2026-03-30T01:00:00.000Z	54 \| moderate	11.16 \| good	49.77 \| good	28.048 \| good	1.908 \| good	14.767 \| good	0.217 \| good
2026-03-30T02:00:00.000Z	49 \| good	8.777 \| good	38.452 \| good	35.668 \| good	1.821 \| good	13.412 \| good	0.204 \| good
2026-03-30T03:00:00.000Z	44 \| good	7.674 \| good	33.659 \| good	36.328 \| good	1.733 \| good	12.057 \| good	0.191 \| good
2026-03-30T04:00:00.000Z	38 \| good	6.597 \| good	29.356 \| good	33.931 \| good	1.629 \| good	10.241 \| good	0.183 \| good
2026-03-30T05:00:00.000Z	33 \| good	6.359 \| good	28.17 \| good	30.092 \| good	1.525 \| good	8.425 \| good	0.174 \| good
2026-03-30T06:00:00.000Z	27 \| good	4.61 \| good	20.177 \| good	27.891 \| good	1.42 \| good	6.609 \| good	0.166 \| good
2026-03-30T07:00:00.000Z	30 \| good	3.559 \| good	15.285 \| good	31.895 \| good	1.438 \| good	6.09 \| good	0.172 \| good
2026-03-30T08:00:00.000Z	26 \| good	3.699 \| good	16.18 \| good	27.632 \| good	1.457 \| good	5.57 \| good	0.178 \| good
2026-03-30T09:00:00.000Z	23 \| good	3.64 \| good	15.848 \| good	24.513 \| good	1.475 \| good	5.05 \| good	0.185 \| good
2026-03-30T10:00:00.000Z	27 \| good	5.124 \| good	22.126 \| good	11.855 \| good	1.589 \| good	6.08 \| good	0.195 \| good
2026-03-30T11:00:00.000Z	33 \| good	5.964 \| good	26.379 \| good	10.54 \| good	1.704 \| good	7.11 \| good	0.205 \| good
2026-03-30T12:00:00.000Z	44 \| good	7.53 \| good	33.106 \| good	15.097 \| good	1.818 \| good	8.139 \| good	0.215 \| good
2026-03-30T13:00:00.000Z	38 \| good	7.113 \| good	31.052 \| good	19.265 \| good	1.971 \| good	8.092 \| good	0.209 \| good
2026-03-30T14:00:00.000Z	33 \| good	6.391 \| good	28.338 \| good	23.056 \| good	2.124 \| good	8.044 \| good	0.203 \| good
2026-03-30T15:00:00.000Z	27 \| good	4.726 \| good	20.548 \| good	27.253 \| good	2.277 \| good	7.996 \| good	0.197 \| good
2026-03-30T16:00:00.000Z	22 \| good	4.359 \| good	18.888 \| good	23.873 \| good	2.333 \| good	7.251 \| good	0.191 \| good
2026-03-30T17:00:00.000Z	33 \| good	5.699 \| good	24.916 \| good	20.772 \| good	2.388 \| good	6.505 \| good	0.186 \| good
2026-03-30T18:00:00.000Z	38 \| good	7.135 \| good	31.64 \| good	27.528 \| good	2.443 \| good	5.759 \| good	0.18 \| good
2026-03-30T19:00:00.000Z	49 \| good	8.732 \| good	38.611 \| good	28.359 \| good	2.425 \| good	5.976 \| good	0.18 \| good
2026-03-30T20:00:00.000Z	49 \| good	9.103 \| good	40.534 \| good	29.282 \| good	2.406 \| good	6.193 \| good	0.181 \| good
2026-03-30T21:00:00.000Z	52 \| moderate	10.34 \| good	45.811 \| good	27.62 \| good	2.388 \| good	6.41 \| good	0.181 \| good
2026-03-30T22:00:00.000Z	54 \| moderate	11.198 \| good	50.098 \| good	24.361 \| good	2.507 \| good	9.68 \| good	0.195 \| good
2026-03-30T23:00:00.000Z	49 \| good	8.915 \| good	39.721 \| good	28.723 \| good	2.626 \| good	12.95 \| good	0.209 \| good
2026-03-31T00:00:00.000Z	54 \| moderate	11.227 \| good	49.688 \| good	29.817 \| good	2.745 \| good	16.221 \| good	0.223 \| good
2026-03-31T01:00:00.000Z	56 \| moderate	11.662 \| good	52.132 \| good	30.185 \| good	2.731 \| good	16.462 \| good	0.221 \| good
2026-03-31T02:00:00.000Z	58 \| moderate	13.388 \| fine	60.191 \| fine	21.076 \| good	2.718 \| good	16.704 \| good	0.218 \| good
2026-03-31T03:00:00.000Z	60 \| moderate	14.017 \| fine	62.984 \| fine	22.341 \| good	2.704 \| good	16.946 \| good	0.216 \| good
2026-03-31T04:00:00.000Z	60 \| moderate	13.724 \| fine	62.175 \| fine	17.154 \| good	2.556 \| good	14.704 \| good	0.206 \| good
2026-03-31T05:00:00.000Z	56 \| moderate	12.047 \| good	53.906 \| good	19.909 \| good	2.407 \| good	12.461 \| good	0.196 \| good
2026-03-31T06:00:00.000Z	52 \| moderate	10.178 \| good	10.584 \| good	36.03 \| good	2.284 \| good	10.239 \| good	0.186 \| good
2026-03-31T07:00:00.000Z	54 \| moderate	10.663 \| good	47.304 \| good	13.674 \| good	2.161 \| good	9.302 \| good	0.178 \| good
2026-03-31T08:00:00.000Z	56 \| moderate	11.801 \| good	52.616 \| good	12.42 \| good	2.065 \| good	8.385 \| good	0.171 \| good
2026-03-31T09:00:00.000Z	54 \| moderate	11.375 \| good	50.787 \| good	9.945 \| good	1.968 \| good	7.469 \| good	0.164 \| good
2026-03-31T10:00:00.000Z	27 \| good	4.914 \| good	21.232 \| good	19.14 \| good	1.96 \| good	8.496 \| good	0.167 \| good
2026-03-31T11:00:00.000Z	33 \| good	6.141 \| good	26.792 \| good	19.261 \| good	1.952 \| good	9.523 \| good	0.17 \| good
2026-03-31T12:00:00.000Z	49 \| good	9.412 \| good	9.878 \| good	32.031 \| good	1.948 \| good	10.488 \| good	0.173 \| good
2026-03-31T13:00:00.000Z	52 \| moderate	9.948 \| good	10.412 \| good	31.967 \| good	2.018 \| good	10.534 \| good	0.18 \| good
2026-03-31T14:00:00.000Z	54 \| moderate	10.869 \| good	11.485 \| good	31.902 \| good	2.089 \| good	10.58 \| good	0.187 \| good
2026-03-31T15:00:00.000Z	52 \| moderate	10.331 \| good	10.855 \| good	31.838 \| good	2.16 \| good	10.626 \| good	0.194 \| good
2026-03-31T16:00:00.000Z	52 \| moderate	9.643 \| good	10.218 \| good	35.605 \| good	2.118 \| good	9.286 \| good	0.188 \| good
2026-03-31T17:00:00.000Z	52 \| moderate	10.135 \| good	44.884 \| good	29.397 \| good	2.071 \| good	8.031 \| good	0.182 \| good
2026-03-31T18:00:00.000Z	52 \| moderate	10.171 \| good	10.843 \| good	43.139 \| good	2.032 \| good	6.605 \| good	0.176 \| good
2026-03-31T19:00:00.000Z	52 \| moderate	10.428 \| good	11.158 \| good	43.491 \| good	2.017 \| good	7.898 \| good	0.181 \| good
2026-03-31T20:00:00.000Z	54 \| moderate	10.759 \| good	11.526 \| good	43.842 \| good	2.002 \| good	9.191 \| good	0.187 \| good
2026-03-31T21:00:00.000Z	56 \| moderate	11.836 \| good	12.569 \| good	44.194 \| good	1.987 \| good	10.483 \| good	0.192 \| good
2026-03-31T22:00:00.000Z	56 \| moderate	12.48 \| fine	13.174 \| good	42.069 \| good	2.001 \| good	12.685 \| good	0.198 \| good

Greenwich

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Greenwich, Connecticut air quality map: Track AQI near you

0.27ppm

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 09:00:00 on 2026-03-29.

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 03:00:00 on 2026-03-29.

What is the current air quality in Greenwich, Connecticut?

The current air quality in Greenwich, Connecticut is 41, 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 4.977 μg/m³.

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

The current PM₁₀ concentration at Greenwich, Connecticut is 17.975 μg/m³.

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

The current carbon monoxide (CO) concentration at Greenwich, Connecticut is 0.255 ppm.

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

The current sulfur dioxide (SO₂) concentration at Greenwich, Connecticut is 0.309 ppb.

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

The current ozone (O₃) concentration at Greenwich, Connecticut is 43.929 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Greenwich, Connecticut is 5.905 ppb.

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