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

The current PM10 concentration at Greenwich, Connecticut is 72.618 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Greenwich, Connecticut is 0.411 ppb.

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

The current ozone (O3) concentration at Greenwich, Connecticut is 13.086 ppm.

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

The current nitrogen dioxide (NO2) concentration at Greenwich, Connecticut is 26.283 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 14.726 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)

Moderate

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)

14.73 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

72.62 μg/m³

155

255

425

605+

Ozone (O₃)

13.09 ppb

201

201+

Sulfur Dioxide (SO₂)

0.41 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

26.28 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.43 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
2025-12-27T00:00:00.000Z	27 \| good	3.166 \| good	16.172 \| good	29.436 \| good	0.508 \| good	15.721 \| good	0.353 \| good
2025-12-27T01:00:00.000Z	27 \| good	4.907 \| good	25.872 \| good	29.32 \| good	0.494 \| good	14.605 \| good	0.331 \| good
2025-12-27T02:00:00.000Z	26 \| good	3.394 \| good	14.98 \| good	28.405 \| good	0.596 \| good	15.597 \| good	0.331 \| good
2025-12-27T03:00:00.000Z	22 \| good	3.81 \| good	11.545 \| good	24.444 \| good	0.494 \| good	17.06 \| good	0.318 \| good
2025-12-27T04:00:00.000Z	27 \| good	4.712 \| good	19.052 \| good	26.789 \| good	0.495 \| good	16.194 \| good	0.296 \| good
2025-12-27T05:00:00.000Z	27 \| good	4.882 \| good	22.05 \| good	27.003 \| good	0.615 \| good	10.446 \| good	0.312 \| good
2025-12-27T06:00:00.000Z	33 \| good	5.658 \| good	27.663 \| good	28.549 \| good	0.618 \| good	13.712 \| good	0.312 \| good
2025-12-27T07:00:00.000Z	29 \| good	5.492 \| good	21.282 \| good	30.932 \| good	0.618 \| good	15.121 \| good	0.302 \| good
2025-12-27T08:00:00.000Z	28 \| good	4.686 \| good	18.581 \| good	29.822 \| good	0.474 \| good	19.198 \| good	0.302 \| good
2025-12-27T09:00:00.000Z	27 \| good	5.254 \| good	22.95 \| good	25.196 \| good	0.501 \| good	17.71 \| good	0.279 \| good
2025-12-27T10:00:00.000Z	27 \| good	4.847 \| good	17.956 \| good	21.548 \| good	0.472 \| good	6.183 \| good	0.242 \| good
2025-12-27T11:00:00.000Z	27 \| good	4.689 \| good	13.397 \| good	27.89 \| good	0.436 \| good	7.39 \| good	0.242 \| good
2025-12-27T12:00:00.000Z	33 \| good	5.977 \| good	20.848 \| good	26.773 \| good	0.35 \| good	7.625 \| good	0.197 \| good
2025-12-27T13:00:00.000Z	27 \| good	4.641 \| good	17.418 \| good	27.103 \| good	0.343 \| good	8.224 \| good	0.225 \| good
2025-12-27T14:00:00.000Z	27 \| good	4.707 \| good	13.667 \| good	26.129 \| good	0.371 \| good	7.853 \| good	0.258 \| good
2025-12-27T15:00:00.000Z	38 \| good	7.295 \| good	22.68 \| good	28.933 \| good	0.339 \| good	7.89 \| good	0.258 \| good
2025-12-27T16:00:00.000Z	26 \| good	4.144 \| good	12.442 \| good	28.484 \| good	0.331 \| good	6.087 \| good	0.258 \| good
2025-12-27T17:00:00.000Z	28 \| good	3.749 \| good	10.251 \| good	30.318 \| good	0.324 \| good	5.471 \| good	0.258 \| good
2025-12-27T18:00:00.000Z	28 \| good	3.971 \| good	11.463 \| good	30.248 \| good	0.358 \| good	5.101 \| good	0.258 \| good
2025-12-27T19:00:00.000Z	30 \| good	4.107 \| good	18.906 \| good	32.187 \| good	0.351 \| good	5.88 \| good	0.258 \| good
2025-12-27T20:00:00.000Z	29 \| good	4.951 \| good	11.946 \| good	30.503 \| good	0.344 \| good	6.079 \| good	0.271 \| good
2025-12-27T21:00:00.000Z	29 \| good	4.139 \| good	14.826 \| good	30.771 \| good	0.338 \| good	7.443 \| good	0.242 \| good
2025-12-27T22:00:00.000Z	33 \| good	6.324 \| good	20.071 \| good	32.647 \| good	0.332 \| good	11.259 \| good	0.31 \| good
2025-12-27T23:00:00.000Z	38 \| good	6.508 \| good	27.669 \| good	30.731 \| good	0.358 \| good	19.927 \| good	0.341 \| good
2025-12-28T00:00:00.000Z	33 \| good	5.51 \| good	14.172 \| good	22.331 \| good	0.372 \| good	17.892 \| good	0.341 \| good
2025-12-28T01:00:00.000Z	38 \| good	7.033 \| good	26.284 \| good	23.503 \| good	0.462 \| good	17.749 \| good	0.344 \| good
2025-12-28T02:00:00.000Z	33 \| good	6.19 \| good	26.286 \| good	22.236 \| good	0.524 \| good	21.497 \| good	0.361 \| good
2025-12-28T03:00:00.000Z	33 \| good	5.71 \| good	24.872 \| good	19.737 \| good	1.932 \| good	25.003 \| good	0.398 \| good
2025-12-28T04:00:00.000Z	27 \| good	4.739 \| good	11.712 \| good	20.051 \| good	0.546 \| good	6.366 \| good	0.408 \| good
2025-12-28T05:00:00.000Z	27 \| good	4.779 \| good	9.577 \| good	15.298 \| good	0.497 \| good	4.89 \| good	0.452 \| good
2025-12-28T06:00:00.000Z	29 \| good	4.737 \| good	17.901 \| good	30.585 \| good	0.553 \| good	7.165 \| good	0.393 \| good
2025-12-28T07:00:00.000Z	33 \| good	5.708 \| good	29.212 \| good	19.858 \| good	0.534 \| good	6.225 \| good	0.448 \| good
2025-12-28T08:00:00.000Z	44 \| good	7.914 \| good	30.815 \| good	16.55 \| good	0.481 \| good	5.248 \| good	0.417 \| good
2025-12-28T09:00:00.000Z	49 \| good	8.878 \| good	25.32 \| good	9.237 \| good	0.707 \| good	5.773 \| good	0.372 \| good
2025-12-28T10:00:00.000Z	53 \| moderate	10.318 \| good	60.432 \| fine	9.093 \| good	0.554 \| good	5.5 \| good	0.419 \| good
2025-12-28T11:00:00.000Z	44 \| good	7.654 \| good	33.36 \| good	12.006 \| good	0.434 \| good	5.257 \| good	0.385 \| good
2025-12-28T12:00:00.000Z	44 \| good	8.188 \| good	33.077 \| good	9.52 \| good	0.468 \| good	19.645 \| good	0.373 \| good
2025-12-28T13:00:00.000Z	38 \| good	6.749 \| good	40.406 \| good	14.91 \| good	0.467 \| good	13.092 \| good	0.373 \| good
2025-12-28T14:00:00.000Z	38 \| good	6.716 \| good	14.962 \| good	11.731 \| good	0.537 \| good	12.219 \| good	0.471 \| good
2025-12-28T15:00:00.000Z	33 \| good	6.259 \| good	18.023 \| good	17.73 \| good	0.347 \| good	11.78 \| good	0.395 \| good
2025-12-28T16:00:00.000Z	49 \| good	8.867 \| good	42.349 \| good	14.386 \| good	0.32 \| good	14.832 \| good	0.35 \| good
2025-12-28T17:00:00.000Z	49 \| good	9.353 \| good	42.106 \| good	16.395 \| good	0.348 \| good	12.478 \| good	0.316 \| good
2025-12-28T18:00:00.000Z	56 \| moderate	12.37 \| fine	55.974 \| fine	17.183 \| good	0.419 \| good	9.294 \| good	0.338 \| good
2025-12-28T19:00:00.000Z	56 \| moderate	11.973 \| good	59.438 \| fine	16.633 \| good	0.432 \| good	12.465 \| good	0.338 \| good
2025-12-28T20:00:00.000Z	56 \| moderate	12.217 \| fine	51.629 \| good	18.125 \| good	0.517 \| good	15.779 \| good	0.361 \| good
2025-12-28T21:00:00.000Z	54 \| moderate	11.116 \| good	62.186 \| fine	17.365 \| good	0.47 \| good	21.436 \| good	0.415 \| good
2025-12-28T22:00:00.000Z	62 \| moderate	14.726 \| fine	72.618 \| fine	13.086 \| good	0.411 \| good	26.283 \| good	0.432 \| good
2025-12-28T23:00:00.000Z	62 \| moderate	14.726 \| fine	72.618 \| fine	13.086 \| good	0.411 \| good	26.283 \| good	0.432 \| good
2025-12-29T00:00:00.000Z	66 \| moderate	16.804 \| fine	74.452 \| fine	9.212 \| good	2.883 \| good	28.348 \| good	0.345 \| good
2025-12-29T01:00:00.000Z	54 \| moderate	11.132 \| good	49.534 \| good	12.692 \| good	2.511 \| good	27.942 \| good	0.311 \| good
2025-12-29T02:00:00.000Z	49 \| good	9.023 \| good	39.988 \| good	18.537 \| good	2.139 \| good	27.536 \| good	0.277 \| good
2025-12-29T03:00:00.000Z	44 \| good	7.652 \| good	33.904 \| good	23.542 \| good	1.767 \| good	27.13 \| good	0.243 \| good
2025-12-29T04:00:00.000Z	33 \| good	6.01 \| good	26.439 \| good	22.741 \| good	1.504 \| good	22.224 \| good	0.217 \| good
2025-12-29T05:00:00.000Z	22 \| good	4.025 \| good	17.516 \| good	21.134 \| good	1.24 \| good	17.318 \| good	0.192 \| good
2025-12-29T06:00:00.000Z	19 \| good	3.242 \| good	13.835 \| good	20.172 \| good	0.977 \| good	12.412 \| good	0.166 \| good
2025-12-29T07:00:00.000Z	19 \| good	2.853 \| good	11.676 \| good	20.226 \| good	1.022 \| good	10.652 \| good	0.161 \| good
2025-12-29T08:00:00.000Z	16 \| good	2.509 \| good	10.371 \| good	17.164 \| good	1.067 \| good	8.892 \| good	0.155 \| good
2025-12-29T09:00:00.000Z	16 \| good	3.323 \| good	14.463 \| good	10.898 \| good	1.112 \| good	7.132 \| good	0.15 \| good
2025-12-29T10:00:00.000Z	22 \| good	4.313 \| good	18.957 \| good	6.464 \| good	1.305 \| good	9.258 \| good	0.161 \| good
2025-12-29T11:00:00.000Z	27 \| good	5.157 \| good	22.187 \| good	7.611 \| good	1.499 \| good	11.383 \| good	0.172 \| good
2025-12-29T12:00:00.000Z	22 \| good	4.197 \| good	18.275 \| good	4.696 \| good	1.692 \| good	13.509 \| good	0.183 \| good
2025-12-29T13:00:00.000Z	22 \| good	4.101 \| good	18.114 \| good	6.456 \| good	1.815 \| good	14.792 \| good	0.194 \| good
2025-12-29T14:00:00.000Z	27 \| good	5.326 \| good	23.155 \| good	7.629 \| good	1.938 \| good	16.075 \| good	0.206 \| good
2025-12-29T15:00:00.000Z	27 \| good	5.234 \| good	22.775 \| good	5.559 \| good	2.061 \| good	17.358 \| good	0.217 \| good
2025-12-29T16:00:00.000Z	38 \| good	6.531 \| good	28.819 \| good	2.67 \| good	2.116 \| good	16.502 \| good	0.215 \| good
2025-12-29T17:00:00.000Z	44 \| good	8.223 \| good	36.527 \| good	5.64 \| good	2.17 \| good	15.646 \| good	0.214 \| good
2025-12-29T18:00:00.000Z	38 \| good	7.395 \| good	32.868 \| good	21.504 \| good	2.225 \| good	14.79 \| good	0.212 \| good
2025-12-29T19:00:00.000Z	37 \| good	4.011 \| good	17.492 \| good	39.51 \| good	2.065 \| good	12.121 \| good	0.195 \| good
2025-12-29T20:00:00.000Z	38 \| good	3.404 \| good	14.965 \| good	40.721 \| good	1.905 \| good	9.451 \| good	0.178 \| good
2025-12-29T21:00:00.000Z	38 \| good	7.342 \| good	32.394 \| good	35.766 \| good	1.745 \| good	6.782 \| good	0.16 \| good
2025-12-29T22:00:00.000Z	38 \| good	7.09 \| good	31.472 \| good	27.824 \| good	1.68 \| good	6.178 \| good	0.166 \| good
2025-12-29T23:00:00.000Z	38 \| good	6.957 \| good	31.085 \| good	23.572 \| good	1.615 \| good	5.573 \| good	0.171 \| good
2025-12-30T00:00:00.000Z	38 \| good	6.622 \| good	29.347 \| good	15.788 \| good	1.55 \| good	4.969 \| good	0.176 \| good
2025-12-30T01:00:00.000Z	22 \| good	4.211 \| good	18.405 \| good	15.033 \| good	1.448 \| good	5.096 \| good	0.174 \| good
2025-12-30T02:00:00.000Z	33 \| good	5.902 \| good	26.038 \| good	16.848 \| good	1.346 \| good	5.223 \| good	0.171 \| good
2025-12-30T03:00:00.000Z	33 \| good	6.417 \| good	28.57 \| good	20.772 \| good	1.244 \| good	5.351 \| good	0.168 \| good
2025-12-30T04:00:00.000Z	24 \| good	4.274 \| good	18.884 \| good	26.02 \| good	1.061 \| good	4.433 \| good	0.161 \| good
2025-12-30T05:00:00.000Z	28 \| good	5.343 \| good	23.032 \| good	29.685 \| good	0.878 \| good	3.514 \| good	0.155 \| good
2025-12-30T06:00:00.000Z	30 \| good	3.994 \| good	17.462 \| good	32.288 \| good	0.695 \| good	2.596 \| good	0.148 \| good
2025-12-30T07:00:00.000Z	31 \| good	3.964 \| good	17.483 \| good	33.191 \| good	0.601 \| good	2.311 \| good	0.145 \| good
2025-12-30T08:00:00.000Z	31 \| good	2.232 \| good	9.264 \| good	33.31 \| good	0.507 \| good	2.026 \| good	0.142 \| good
2025-12-30T09:00:00.000Z	31 \| good	2.23 \| good	9.064 \| good	33.625 \| good	0.413 \| good	1.741 \| good	0.139 \| good
2025-12-30T10:00:00.000Z	30 \| good	1.897 \| good	7.803 \| good	31.738 \| good	0.457 \| good	2.359 \| good	0.143 \| good
2025-12-30T11:00:00.000Z	31 \| good	2.056 \| good	8.357 \| good	34.154 \| good	0.5 \| good	2.976 \| good	0.146 \| good
2025-12-30T12:00:00.000Z	31 \| good	1.666 \| good	6.769 \| good	32.932 \| good	0.544 \| good	3.594 \| good	0.149 \| good
2025-12-30T13:00:00.000Z	31 \| good	1.856 \| good	7.866 \| good	32.77 \| good	0.518 \| good	3.285 \| good	0.148 \| good
2025-12-30T14:00:00.000Z	31 \| good	2.17 \| good	8.91 \| good	32.551 \| good	0.492 \| good	2.975 \| good	0.147 \| good
2025-12-30T15:00:00.000Z	31 \| good	1.179 \| good	4.84 \| good	34.022 \| good	0.466 \| good	2.665 \| good	0.146 \| good
2025-12-30T16:00:00.000Z	33 \| good	0.628 \| good	2.332 \| good	35.711 \| good	0.466 \| good	2.49 \| good	0.142 \| good
2025-12-30T17:00:00.000Z	36 \| good	0.643 \| good	2.3 \| good	38.805 \| good	0.465 \| good	2.314 \| good	0.139 \| good
2025-12-30T18:00:00.000Z	37 \| good	2.13 \| good	8.769 \| good	40.27 \| good	0.465 \| good	2.138 \| good	0.135 \| good
2025-12-30T19:00:00.000Z	38 \| good	2.851 \| good	11.908 \| good	40.691 \| good	0.516 \| good	2.38 \| good	0.135 \| good
2025-12-30T20:00:00.000Z	38 \| good	3.404 \| good	14.674 \| good	41.149 \| good	0.568 \| good	2.621 \| good	0.134 \| good
2025-12-30T21:00:00.000Z	39 \| good	4.078 \| good	17.665 \| good	41.55 \| good	0.62 \| good	2.863 \| good	0.133 \| good
2025-12-30T22:00:00.000Z	37 \| good	3.572 \| good	15.512 \| good	40.497 \| good	0.685 \| good	3.919 \| good	0.136 \| good
2025-12-30T23:00:00.000Z	35 \| good	4.095 \| good	17.808 \| good	37.692 \| good	0.751 \| good	4.976 \| good	0.14 \| good

Greenwich

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Greenwich, Connecticut air quality map: Track AQI near you

0.45ppm

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 10:00:00 on 2025-12-28.

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 05:00:00 on 2025-12-28.

What is the current air quality in Greenwich, Connecticut?

The current air quality in Greenwich, Connecticut is 62, categorized as Moderate based on real-time data.

What pollutant is the most common in Greenwich, Connecticut?

The most common pollutant in Greenwich, Connecticut is PM2.5.

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 14.726 μg/m³.

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

The current PM₁₀ concentration at Greenwich, Connecticut is 72.618 μg/m³.

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

The current carbon monoxide (CO) concentration at Greenwich, Connecticut is 0.432 ppm.

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

The current sulfur dioxide (SO₂) concentration at Greenwich, Connecticut is 0.411 ppb.

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

The current ozone (O₃) concentration at Greenwich, Connecticut is 13.086 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Greenwich, Connecticut is 26.283 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-12-27T00:00:00.000Z	27 \| good	3.166 \| good	16.172 \| good	29.436 \| good	0.508 \| good	15.721 \| good	0.353 \| good
2025-12-27T01:00:00.000Z	27 \| good	4.907 \| good	25.872 \| good	29.32 \| good	0.494 \| good	14.605 \| good	0.331 \| good
2025-12-27T02:00:00.000Z	26 \| good	3.394 \| good	14.98 \| good	28.405 \| good	0.596 \| good	15.597 \| good	0.331 \| good
2025-12-27T03:00:00.000Z	22 \| good	3.81 \| good	11.545 \| good	24.444 \| good	0.494 \| good	17.06 \| good	0.318 \| good
2025-12-27T04:00:00.000Z	27 \| good	4.712 \| good	19.052 \| good	26.789 \| good	0.495 \| good	16.194 \| good	0.296 \| good
2025-12-27T05:00:00.000Z	27 \| good	4.882 \| good	22.05 \| good	27.003 \| good	0.615 \| good	10.446 \| good	0.312 \| good
2025-12-27T06:00:00.000Z	33 \| good	5.658 \| good	27.663 \| good	28.549 \| good	0.618 \| good	13.712 \| good	0.312 \| good
2025-12-27T07:00:00.000Z	29 \| good	5.492 \| good	21.282 \| good	30.932 \| good	0.618 \| good	15.121 \| good	0.302 \| good
2025-12-27T08:00:00.000Z	28 \| good	4.686 \| good	18.581 \| good	29.822 \| good	0.474 \| good	19.198 \| good	0.302 \| good
2025-12-27T09:00:00.000Z	27 \| good	5.254 \| good	22.95 \| good	25.196 \| good	0.501 \| good	17.71 \| good	0.279 \| good
2025-12-27T10:00:00.000Z	27 \| good	4.847 \| good	17.956 \| good	21.548 \| good	0.472 \| good	6.183 \| good	0.242 \| good
2025-12-27T11:00:00.000Z	27 \| good	4.689 \| good	13.397 \| good	27.89 \| good	0.436 \| good	7.39 \| good	0.242 \| good
2025-12-27T12:00:00.000Z	33 \| good	5.977 \| good	20.848 \| good	26.773 \| good	0.35 \| good	7.625 \| good	0.197 \| good
2025-12-27T13:00:00.000Z	27 \| good	4.641 \| good	17.418 \| good	27.103 \| good	0.343 \| good	8.224 \| good	0.225 \| good
2025-12-27T14:00:00.000Z	27 \| good	4.707 \| good	13.667 \| good	26.129 \| good	0.371 \| good	7.853 \| good	0.258 \| good
2025-12-27T15:00:00.000Z	38 \| good	7.295 \| good	22.68 \| good	28.933 \| good	0.339 \| good	7.89 \| good	0.258 \| good
2025-12-27T16:00:00.000Z	26 \| good	4.144 \| good	12.442 \| good	28.484 \| good	0.331 \| good	6.087 \| good	0.258 \| good
2025-12-27T17:00:00.000Z	28 \| good	3.749 \| good	10.251 \| good	30.318 \| good	0.324 \| good	5.471 \| good	0.258 \| good
2025-12-27T18:00:00.000Z	28 \| good	3.971 \| good	11.463 \| good	30.248 \| good	0.358 \| good	5.101 \| good	0.258 \| good
2025-12-27T19:00:00.000Z	30 \| good	4.107 \| good	18.906 \| good	32.187 \| good	0.351 \| good	5.88 \| good	0.258 \| good
2025-12-27T20:00:00.000Z	29 \| good	4.951 \| good	11.946 \| good	30.503 \| good	0.344 \| good	6.079 \| good	0.271 \| good
2025-12-27T21:00:00.000Z	29 \| good	4.139 \| good	14.826 \| good	30.771 \| good	0.338 \| good	7.443 \| good	0.242 \| good
2025-12-27T22:00:00.000Z	33 \| good	6.324 \| good	20.071 \| good	32.647 \| good	0.332 \| good	11.259 \| good	0.31 \| good
2025-12-27T23:00:00.000Z	38 \| good	6.508 \| good	27.669 \| good	30.731 \| good	0.358 \| good	19.927 \| good	0.341 \| good
2025-12-28T00:00:00.000Z	33 \| good	5.51 \| good	14.172 \| good	22.331 \| good	0.372 \| good	17.892 \| good	0.341 \| good
2025-12-28T01:00:00.000Z	38 \| good	7.033 \| good	26.284 \| good	23.503 \| good	0.462 \| good	17.749 \| good	0.344 \| good
2025-12-28T02:00:00.000Z	33 \| good	6.19 \| good	26.286 \| good	22.236 \| good	0.524 \| good	21.497 \| good	0.361 \| good
2025-12-28T03:00:00.000Z	33 \| good	5.71 \| good	24.872 \| good	19.737 \| good	1.932 \| good	25.003 \| good	0.398 \| good
2025-12-28T04:00:00.000Z	27 \| good	4.739 \| good	11.712 \| good	20.051 \| good	0.546 \| good	6.366 \| good	0.408 \| good
2025-12-28T05:00:00.000Z	27 \| good	4.779 \| good	9.577 \| good	15.298 \| good	0.497 \| good	4.89 \| good	0.452 \| good
2025-12-28T06:00:00.000Z	29 \| good	4.737 \| good	17.901 \| good	30.585 \| good	0.553 \| good	7.165 \| good	0.393 \| good
2025-12-28T07:00:00.000Z	33 \| good	5.708 \| good	29.212 \| good	19.858 \| good	0.534 \| good	6.225 \| good	0.448 \| good
2025-12-28T08:00:00.000Z	44 \| good	7.914 \| good	30.815 \| good	16.55 \| good	0.481 \| good	5.248 \| good	0.417 \| good
2025-12-28T09:00:00.000Z	49 \| good	8.878 \| good	25.32 \| good	9.237 \| good	0.707 \| good	5.773 \| good	0.372 \| good
2025-12-28T10:00:00.000Z	53 \| moderate	10.318 \| good	60.432 \| fine	9.093 \| good	0.554 \| good	5.5 \| good	0.419 \| good
2025-12-28T11:00:00.000Z	44 \| good	7.654 \| good	33.36 \| good	12.006 \| good	0.434 \| good	5.257 \| good	0.385 \| good
2025-12-28T12:00:00.000Z	44 \| good	8.188 \| good	33.077 \| good	9.52 \| good	0.468 \| good	19.645 \| good	0.373 \| good
2025-12-28T13:00:00.000Z	38 \| good	6.749 \| good	40.406 \| good	14.91 \| good	0.467 \| good	13.092 \| good	0.373 \| good
2025-12-28T14:00:00.000Z	38 \| good	6.716 \| good	14.962 \| good	11.731 \| good	0.537 \| good	12.219 \| good	0.471 \| good
2025-12-28T15:00:00.000Z	33 \| good	6.259 \| good	18.023 \| good	17.73 \| good	0.347 \| good	11.78 \| good	0.395 \| good
2025-12-28T16:00:00.000Z	49 \| good	8.867 \| good	42.349 \| good	14.386 \| good	0.32 \| good	14.832 \| good	0.35 \| good
2025-12-28T17:00:00.000Z	49 \| good	9.353 \| good	42.106 \| good	16.395 \| good	0.348 \| good	12.478 \| good	0.316 \| good
2025-12-28T18:00:00.000Z	56 \| moderate	12.37 \| fine	55.974 \| fine	17.183 \| good	0.419 \| good	9.294 \| good	0.338 \| good
2025-12-28T19:00:00.000Z	56 \| moderate	11.973 \| good	59.438 \| fine	16.633 \| good	0.432 \| good	12.465 \| good	0.338 \| good
2025-12-28T20:00:00.000Z	56 \| moderate	12.217 \| fine	51.629 \| good	18.125 \| good	0.517 \| good	15.779 \| good	0.361 \| good
2025-12-28T21:00:00.000Z	54 \| moderate	11.116 \| good	62.186 \| fine	17.365 \| good	0.47 \| good	21.436 \| good	0.415 \| good
2025-12-28T22:00:00.000Z	62 \| moderate	14.726 \| fine	72.618 \| fine	13.086 \| good	0.411 \| good	26.283 \| good	0.432 \| good
2025-12-28T23:00:00.000Z	62 \| moderate	14.726 \| fine	72.618 \| fine	13.086 \| good	0.411 \| good	26.283 \| good	0.432 \| good
2025-12-29T00:00:00.000Z	66 \| moderate	16.804 \| fine	74.452 \| fine	9.212 \| good	2.883 \| good	28.348 \| good	0.345 \| good
2025-12-29T01:00:00.000Z	54 \| moderate	11.132 \| good	49.534 \| good	12.692 \| good	2.511 \| good	27.942 \| good	0.311 \| good
2025-12-29T02:00:00.000Z	49 \| good	9.023 \| good	39.988 \| good	18.537 \| good	2.139 \| good	27.536 \| good	0.277 \| good
2025-12-29T03:00:00.000Z	44 \| good	7.652 \| good	33.904 \| good	23.542 \| good	1.767 \| good	27.13 \| good	0.243 \| good
2025-12-29T04:00:00.000Z	33 \| good	6.01 \| good	26.439 \| good	22.741 \| good	1.504 \| good	22.224 \| good	0.217 \| good
2025-12-29T05:00:00.000Z	22 \| good	4.025 \| good	17.516 \| good	21.134 \| good	1.24 \| good	17.318 \| good	0.192 \| good
2025-12-29T06:00:00.000Z	19 \| good	3.242 \| good	13.835 \| good	20.172 \| good	0.977 \| good	12.412 \| good	0.166 \| good
2025-12-29T07:00:00.000Z	19 \| good	2.853 \| good	11.676 \| good	20.226 \| good	1.022 \| good	10.652 \| good	0.161 \| good
2025-12-29T08:00:00.000Z	16 \| good	2.509 \| good	10.371 \| good	17.164 \| good	1.067 \| good	8.892 \| good	0.155 \| good
2025-12-29T09:00:00.000Z	16 \| good	3.323 \| good	14.463 \| good	10.898 \| good	1.112 \| good	7.132 \| good	0.15 \| good
2025-12-29T10:00:00.000Z	22 \| good	4.313 \| good	18.957 \| good	6.464 \| good	1.305 \| good	9.258 \| good	0.161 \| good
2025-12-29T11:00:00.000Z	27 \| good	5.157 \| good	22.187 \| good	7.611 \| good	1.499 \| good	11.383 \| good	0.172 \| good
2025-12-29T12:00:00.000Z	22 \| good	4.197 \| good	18.275 \| good	4.696 \| good	1.692 \| good	13.509 \| good	0.183 \| good
2025-12-29T13:00:00.000Z	22 \| good	4.101 \| good	18.114 \| good	6.456 \| good	1.815 \| good	14.792 \| good	0.194 \| good
2025-12-29T14:00:00.000Z	27 \| good	5.326 \| good	23.155 \| good	7.629 \| good	1.938 \| good	16.075 \| good	0.206 \| good
2025-12-29T15:00:00.000Z	27 \| good	5.234 \| good	22.775 \| good	5.559 \| good	2.061 \| good	17.358 \| good	0.217 \| good
2025-12-29T16:00:00.000Z	38 \| good	6.531 \| good	28.819 \| good	2.67 \| good	2.116 \| good	16.502 \| good	0.215 \| good
2025-12-29T17:00:00.000Z	44 \| good	8.223 \| good	36.527 \| good	5.64 \| good	2.17 \| good	15.646 \| good	0.214 \| good
2025-12-29T18:00:00.000Z	38 \| good	7.395 \| good	32.868 \| good	21.504 \| good	2.225 \| good	14.79 \| good	0.212 \| good
2025-12-29T19:00:00.000Z	37 \| good	4.011 \| good	17.492 \| good	39.51 \| good	2.065 \| good	12.121 \| good	0.195 \| good
2025-12-29T20:00:00.000Z	38 \| good	3.404 \| good	14.965 \| good	40.721 \| good	1.905 \| good	9.451 \| good	0.178 \| good
2025-12-29T21:00:00.000Z	38 \| good	7.342 \| good	32.394 \| good	35.766 \| good	1.745 \| good	6.782 \| good	0.16 \| good
2025-12-29T22:00:00.000Z	38 \| good	7.09 \| good	31.472 \| good	27.824 \| good	1.68 \| good	6.178 \| good	0.166 \| good
2025-12-29T23:00:00.000Z	38 \| good	6.957 \| good	31.085 \| good	23.572 \| good	1.615 \| good	5.573 \| good	0.171 \| good
2025-12-30T00:00:00.000Z	38 \| good	6.622 \| good	29.347 \| good	15.788 \| good	1.55 \| good	4.969 \| good	0.176 \| good
2025-12-30T01:00:00.000Z	22 \| good	4.211 \| good	18.405 \| good	15.033 \| good	1.448 \| good	5.096 \| good	0.174 \| good
2025-12-30T02:00:00.000Z	33 \| good	5.902 \| good	26.038 \| good	16.848 \| good	1.346 \| good	5.223 \| good	0.171 \| good
2025-12-30T03:00:00.000Z	33 \| good	6.417 \| good	28.57 \| good	20.772 \| good	1.244 \| good	5.351 \| good	0.168 \| good
2025-12-30T04:00:00.000Z	24 \| good	4.274 \| good	18.884 \| good	26.02 \| good	1.061 \| good	4.433 \| good	0.161 \| good
2025-12-30T05:00:00.000Z	28 \| good	5.343 \| good	23.032 \| good	29.685 \| good	0.878 \| good	3.514 \| good	0.155 \| good
2025-12-30T06:00:00.000Z	30 \| good	3.994 \| good	17.462 \| good	32.288 \| good	0.695 \| good	2.596 \| good	0.148 \| good
2025-12-30T07:00:00.000Z	31 \| good	3.964 \| good	17.483 \| good	33.191 \| good	0.601 \| good	2.311 \| good	0.145 \| good
2025-12-30T08:00:00.000Z	31 \| good	2.232 \| good	9.264 \| good	33.31 \| good	0.507 \| good	2.026 \| good	0.142 \| good
2025-12-30T09:00:00.000Z	31 \| good	2.23 \| good	9.064 \| good	33.625 \| good	0.413 \| good	1.741 \| good	0.139 \| good
2025-12-30T10:00:00.000Z	30 \| good	1.897 \| good	7.803 \| good	31.738 \| good	0.457 \| good	2.359 \| good	0.143 \| good
2025-12-30T11:00:00.000Z	31 \| good	2.056 \| good	8.357 \| good	34.154 \| good	0.5 \| good	2.976 \| good	0.146 \| good
2025-12-30T12:00:00.000Z	31 \| good	1.666 \| good	6.769 \| good	32.932 \| good	0.544 \| good	3.594 \| good	0.149 \| good
2025-12-30T13:00:00.000Z	31 \| good	1.856 \| good	7.866 \| good	32.77 \| good	0.518 \| good	3.285 \| good	0.148 \| good
2025-12-30T14:00:00.000Z	31 \| good	2.17 \| good	8.91 \| good	32.551 \| good	0.492 \| good	2.975 \| good	0.147 \| good
2025-12-30T15:00:00.000Z	31 \| good	1.179 \| good	4.84 \| good	34.022 \| good	0.466 \| good	2.665 \| good	0.146 \| good
2025-12-30T16:00:00.000Z	33 \| good	0.628 \| good	2.332 \| good	35.711 \| good	0.466 \| good	2.49 \| good	0.142 \| good
2025-12-30T17:00:00.000Z	36 \| good	0.643 \| good	2.3 \| good	38.805 \| good	0.465 \| good	2.314 \| good	0.139 \| good
2025-12-30T18:00:00.000Z	37 \| good	2.13 \| good	8.769 \| good	40.27 \| good	0.465 \| good	2.138 \| good	0.135 \| good
2025-12-30T19:00:00.000Z	38 \| good	2.851 \| good	11.908 \| good	40.691 \| good	0.516 \| good	2.38 \| good	0.135 \| good
2025-12-30T20:00:00.000Z	38 \| good	3.404 \| good	14.674 \| good	41.149 \| good	0.568 \| good	2.621 \| good	0.134 \| good
2025-12-30T21:00:00.000Z	39 \| good	4.078 \| good	17.665 \| good	41.55 \| good	0.62 \| good	2.863 \| good	0.133 \| good
2025-12-30T22:00:00.000Z	37 \| good	3.572 \| good	15.512 \| good	40.497 \| good	0.685 \| good	3.919 \| good	0.136 \| good
2025-12-30T23:00:00.000Z	35 \| good	4.095 \| good	17.808 \| good	37.692 \| good	0.751 \| good	4.976 \| good	0.14 \| 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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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 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?

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