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

The current PM10 concentration at Greenwich, Connecticut is 57.848 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Greenwich, Connecticut is 2.008 ppb.

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

The current ozone (O3) concentration at Greenwich, Connecticut is 43.157 ppm.

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

The current nitrogen dioxide (NO2) concentration at Greenwich, Connecticut is 20.828 ppb.

Greenwich, Connecticut live air quality index now

Name: Live air pollution levels in Greenwich, Connecticut today
Creator: Ambee

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)

14.71 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

67.00 μg/m³

155

255

425

605+

Ozone (O₃)

30.15 ppb

201

201+

Sulfur Dioxide (SO₂)

1.28 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

26.05 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.32 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
2025-07-28T12:00:00.000Z	38 \| good	7.429 \| good	30.487 \| good	24.844 \| good	0.646 \| good	16.488 \| good	0.377 \| good
2025-07-28T13:00:00.000Z	52 \| moderate	10.242 \| good	43.388 \| good	29.29 \| good	0.462 \| good	8.418 \| good	0.394 \| good
2025-07-28T14:00:00.000Z	52 \| moderate	10.421 \| good	46.259 \| good	29.773 \| good	0.446 \| good	10.643 \| good	0.384 \| good
2025-07-28T15:00:00.000Z	52 \| moderate	9.546 \| good	27.552 \| good	29.683 \| good	0.409 \| good	12.403 \| good	0.291 \| good
2025-07-28T16:00:00.000Z	44 \| good	8.46 \| good	32.11 \| good	38.017 \| good	0.496 \| good	9.439 \| good	0.236 \| good
2025-07-28T17:00:00.000Z	49 \| good	9.366 \| good	40.253 \| good	38.915 \| good	0.523 \| good	6.196 \| good	0.237 \| good
2025-07-28T18:00:00.000Z	54 \| moderate	10.781 \| good	48.936 \| good	45.567 \| good	0.595 \| good	6.265 \| good	0.253 \| good
2025-07-28T19:00:00.000Z	54 \| moderate	11.452 \| good	50.324 \| good	49.475 \| good	0.382 \| good	4.536 \| good	0.237 \| good
2025-07-28T20:00:00.000Z	56 \| moderate	11.563 \| good	42.034 \| good	52.472 \| good	0.463 \| good	4.95 \| good	0.26 \| good
2025-07-28T21:00:00.000Z	50 \| good	8.663 \| good	36.489 \| good	53.663 \| good	0.515 \| good	4.66 \| good	0.267 \| good
2025-07-28T22:00:00.000Z	49 \| good	8.545 \| good	28.043 \| good	48.938 \| good	0.397 \| good	5.423 \| good	0.267 \| good
2025-07-28T23:00:00.000Z	54 \| moderate	10.64 \| good	45.963 \| good	47.456 \| good	0.431 \| good	7.097 \| good	0.276 \| good
2025-07-29T00:00:00.000Z	52 \| moderate	10.054 \| good	35.936 \| good	45.297 \| good	0.47 \| good	3.903 \| good	0.33 \| good
2025-07-29T01:00:00.000Z	56 \| moderate	12.307 \| fine	34.521 \| good	44.032 \| good	0.452 \| good	3.839 \| good	0.327 \| good
2025-07-29T02:00:00.000Z	60 \| moderate	14.349 \| fine	36.27 \| good	34.238 \| good	0.542 \| good	13.942 \| good	0.389 \| good
2025-07-29T03:00:00.000Z	58 \| moderate	12.695 \| fine	50.264 \| good	32.922 \| good	0.84 \| good	10.439 \| good	0.422 \| good
2025-07-29T04:00:00.000Z	62 \| moderate	14.784 \| fine	53.302 \| good	32.922 \| good	0.708 \| good	11.96 \| good	0.451 \| good
2025-07-29T05:00:00.000Z	60 \| moderate	13.744 \| fine	38.843 \| good	33.057 \| good	1.111 \| good	15.675 \| good	0.491 \| good
2025-07-29T06:00:00.000Z	62 \| moderate	15.491 \| fine	66.054 \| fine	24.383 \| good	1.194 \| good	16.505 \| good	0.427 \| good
2025-07-29T07:00:00.000Z	64 \| moderate	15.535 \| fine	61.969 \| fine	19.512 \| good	1.214 \| good	12.622 \| good	0.481 \| good
2025-07-29T08:00:00.000Z	60 \| moderate	14.248 \| fine	63.012 \| fine	16.918 \| good	1.209 \| good	13.262 \| good	0.481 \| good
2025-07-29T09:00:00.000Z	60 \| moderate	13.547 \| fine	56.517 \| fine	15.812 \| good	1.214 \| good	11.015 \| good	0.427 \| good
2025-07-29T10:00:00.000Z	60 \| moderate	13.822 \| fine	50.371 \| good	9.996 \| good	1.236 \| good	12.59 \| good	0.508 \| good
2025-07-29T11:00:00.000Z	66 \| moderate	16.939 \| fine	62.232 \| fine	6.648 \| good	1.233 \| good	24.857 \| good	0.566 \| good
2025-07-29T12:00:00.000Z	67 \| moderate	17.523 \| fine	76.242 \| fine	8.293 \| good	1.31 \| good	22.94 \| good	0.514 \| good
2025-07-29T13:00:00.000Z	64 \| moderate	15.749 \| fine	72.58 \| fine	9.82 \| good	1.508 \| good	26.505 \| good	0.616 \| good
2025-07-29T14:00:00.000Z	69 \| moderate	18.929 \| fine	78.21 \| fine	16.633 \| good	1.168 \| good	31.582 \| good	0.514 \| good
2025-07-29T15:00:00.000Z	62 \| moderate	15.319 \| fine	39.566 \| good	23.206 \| good	1.11 \| good	19.604 \| good	0.456 \| good
2025-07-29T16:00:00.000Z	66 \| moderate	16.876 \| fine	49.253 \| good	30.161 \| good	1.149 \| good	12.297 \| good	0.342 \| good
2025-07-29T17:00:00.000Z	66 \| moderate	16.755 \| fine	60.568 \| fine	41.715 \| good	1.037 \| good	8.149 \| good	0.29 \| good
2025-07-29T18:00:00.000Z	84 \| moderate	14.536 \| fine	60.493 \| fine	65.006 \| fine	0.946 \| good	7.756 \| good	0.339 \| good
2025-07-29T19:00:00.000Z	101 \| sensitive	14.869 \| fine	51.939 \| good	70.768 \| fine	0.651 \| good	7.993 \| good	0.33 \| good
2025-07-29T20:00:00.000Z	101 \| sensitive	14.951 \| fine	67.225 \| fine	71.349 \| moderate	1.376 \| good	11.148 \| good	0.351 \| good
2025-07-29T21:00:00.000Z	126 \| sensitive	12.032 \| good	42.189 \| good	77.639 \| moderate	1.557 \| good	10.907 \| good	0.339 \| good
2025-07-29T22:00:00.000Z	126 \| sensitive	10.125 \| good	37.153 \| good	77.893 \| moderate	1.605 \| good	9.333 \| good	0.339 \| good
2025-07-29T23:00:00.000Z	151 \| unhealthy	12.715 \| fine	50.508 \| good	86.251 \| poor	1.821 \| good	3.084 \| good	0.387 \| good
2025-07-30T00:00:00.000Z	129 \| sensitive	14.111 \| fine	53.904 \| good	79.453 \| moderate	1.548 \| good	3.92 \| good	0.387 \| good
2025-07-30T01:00:00.000Z	115 \| sensitive	13.879 \| fine	60.352 \| fine	74.895 \| moderate	1.626 \| good	8.328 \| good	0.284 \| good
2025-07-30T02:00:00.000Z	119 \| sensitive	13.754 \| fine	44.202 \| good	75.608 \| moderate	1.793 \| good	9.32 \| good	0.327 \| good
2025-07-30T03:00:00.000Z	66 \| moderate	16.921 \| fine	74.832 \| fine	26.909 \| good	1.528 \| good	14.917 \| good	0.304 \| good
2025-07-30T04:00:00.000Z	64 \| moderate	12.42 \| fine	47.97 \| good	58.792 \| fine	2.075 \| good	9.921 \| good	0.317 \| good
2025-07-30T05:00:00.000Z	66 \| moderate	16.877 \| fine	78.768 \| fine	56.735 \| fine	2.06 \| good	13.167 \| good	0.337 \| good
2025-07-30T06:00:00.000Z	62 \| moderate	14.959 \| fine	50.526 \| good	44.147 \| good	1.948 \| good	20.526 \| good	0.329 \| good
2025-07-30T07:00:00.000Z	60 \| moderate	14.29 \| fine	55.443 \| fine	43.313 \| good	1.843 \| good	20.341 \| good	0.277 \| good
2025-07-30T08:00:00.000Z	64 \| moderate	15.576 \| fine	65.489 \| fine	29.262 \| good	1.826 \| good	19.979 \| good	0.277 \| good
2025-07-30T09:00:00.000Z	54 \| moderate	10.824 \| good	44.721 \| good	30.685 \| good	1.3 \| good	25.858 \| good	0.276 \| good
2025-07-30T10:00:00.000Z	62 \| moderate	14.587 \| fine	65.149 \| fine	29.047 \| good	1.177 \| good	25.022 \| good	0.323 \| good
2025-07-30T11:00:00.000Z	62 \| moderate	14.713 \| fine	67 \| fine	30.152 \| good	1.28 \| good	26.053 \| good	0.323 \| good
2025-07-30T09:00:00.000Z	58 \| moderate	13.456 \| fine	60.463 \| fine	22.403 \| good	1.783 \| good	13.363 \| good	0.32 \| good
2025-07-30T10:00:00.000Z	66 \| moderate	17.459 \| fine	77.682 \| fine	20.844 \| good	1.892 \| good	12.591 \| good	0.318 \| good
2025-07-30T11:00:00.000Z	77 \| moderate	22.913 \| fine	100.39 \| fine	20.564 \| good	2 \| good	11.818 \| good	0.315 \| good
2025-07-30T12:00:00.000Z	71 \| moderate	19.949 \| fine	87.823 \| fine	29.127 \| good	2.109 \| good	11.046 \| good	0.313 \| good
2025-07-30T13:00:00.000Z	75 \| moderate	21.687 \| fine	94.99 \| fine	37.934 \| good	2.081 \| good	9.527 \| good	0.295 \| good
2025-07-30T14:00:00.000Z	82 \| moderate	25.632 \| fine	111.504 \| fine	47.961 \| good	2.054 \| good	8.008 \| good	0.277 \| good
2025-07-30T15:00:00.000Z	92 \| moderate	30.701 \| fine	133.224 \| fine	61.665 \| fine	2.026 \| good	6.488 \| good	0.259 \| good
2025-07-30T16:00:00.000Z	122 \| sensitive	29.968 \| fine	129.817 \| fine	77.253 \| moderate	2.013 \| good	5.192 \| good	0.246 \| good
2025-07-30T17:00:00.000Z	154 \| unhealthy	27.827 \| fine	120.639 \| fine	87.185 \| poor	1.999 \| good	3.896 \| good	0.233 \| good
2025-07-30T18:00:00.000Z	166 \| unhealthy	25.097 \| fine	109.116 \| fine	91.882 \| poor	1.986 \| good	2.599 \| good	0.22 \| good
2025-07-30T19:00:00.000Z	156 \| unhealthy	23.894 \| fine	104.342 \| fine	87.971 \| poor	1.898 \| good	2.595 \| good	0.214 \| good
2025-07-30T20:00:00.000Z	112 \| sensitive	21.198 \| fine	93.336 \| fine	74.405 \| moderate	1.81 \| good	2.591 \| good	0.209 \| good
2025-07-30T21:00:00.000Z	115 \| sensitive	22.117 \| fine	96.861 \| fine	75.368 \| moderate	1.722 \| good	2.587 \| good	0.204 \| good
2025-07-30T22:00:00.000Z	79 \| moderate	23.711 \| fine	103.46 \| fine	62.488 \| fine	1.697 \| good	3.882 \| good	0.212 \| good
2025-07-30T23:00:00.000Z	69 \| moderate	19.303 \| fine	85.075 \| fine	51.063 \| good	1.672 \| good	5.177 \| good	0.219 \| good
2025-07-31T00:00:00.000Z	71 \| moderate	20.422 \| fine	89.853 \| fine	46.737 \| good	1.646 \| good	6.472 \| good	0.227 \| good
2025-07-31T01:00:00.000Z	73 \| moderate	21.307 \| fine	93.412 \| fine	40.415 \| good	1.724 \| good	10.098 \| good	0.252 \| good
2025-07-31T02:00:00.000Z	77 \| moderate	22.737 \| fine	99.597 \| fine	38.799 \| good	1.802 \| good	13.724 \| good	0.277 \| good
2025-07-31T03:00:00.000Z	64 \| moderate	16.033 \| fine	71.402 \| fine	39.579 \| good	1.88 \| good	17.35 \| good	0.302 \| good
2025-07-31T04:00:00.000Z	56 \| moderate	11.773 \| good	52.096 \| good	38.598 \| good	1.736 \| good	17.042 \| good	0.298 \| good
2025-07-31T05:00:00.000Z	58 \| moderate	13.083 \| fine	58.654 \| fine	38.393 \| good	1.591 \| good	16.734 \| good	0.294 \| good
2025-07-31T06:00:00.000Z	49 \| good	8.881 \| good	39.192 \| good	40.514 \| good	1.447 \| good	16.427 \| good	0.29 \| good
2025-07-31T07:00:00.000Z	44 \| good	8.075 \| good	35.578 \| good	38.687 \| good	1.571 \| good	15.546 \| good	0.276 \| good
2025-07-31T08:00:00.000Z	49 \| good	8.88 \| good	39.104 \| good	34.584 \| good	1.695 \| good	14.666 \| good	0.263 \| good
2025-07-31T09:00:00.000Z	44 \| good	8.016 \| good	35.199 \| good	34.687 \| good	1.819 \| good	13.785 \| good	0.25 \| good
2025-07-31T10:00:00.000Z	56 \| moderate	12.145 \| fine	54.626 \| good	28.846 \| good	1.755 \| good	11.957 \| good	0.242 \| good
2025-07-31T11:00:00.000Z	64 \| moderate	15.621 \| fine	69.914 \| fine	28.799 \| good	1.691 \| good	10.129 \| good	0.233 \| good
2025-07-31T12:00:00.000Z	66 \| moderate	16.911 \| fine	75.039 \| fine	31.646 \| good	1.627 \| good	8.3 \| good	0.225 \| good
2025-07-31T13:00:00.000Z	67 \| moderate	18.019 \| fine	79.951 \| fine	38.856 \| good	1.359 \| good	7.377 \| good	0.221 \| good
2025-07-31T14:00:00.000Z	69 \| moderate	18.517 \| fine	81.919 \| fine	44.103 \| good	1.091 \| good	6.454 \| good	0.217 \| good
2025-07-31T15:00:00.000Z	66 \| moderate	16.651 \| fine	74.142 \| fine	45.106 \| good	0.823 \| good	5.531 \| good	0.213 \| good
2025-07-31T16:00:00.000Z	69 \| moderate	19.403 \| fine	85.642 \| fine	48.099 \| good	0.789 \| good	4.727 \| good	0.212 \| good
2025-07-31T17:00:00.000Z	69 \| moderate	19.226 \| fine	84.898 \| fine	47.559 \| good	0.755 \| good	3.922 \| good	0.211 \| good
2025-07-31T18:00:00.000Z	62 \| moderate	15.148 \| fine	67.545 \| fine	42.834 \| good	0.721 \| good	3.118 \| good	0.21 \| good
2025-07-31T19:00:00.000Z	62 \| moderate	14.836 \| fine	66.4 \| fine	38.367 \| good	0.707 \| good	3.15 \| good	0.212 \| good
2025-07-31T20:00:00.000Z	64 \| moderate	15.966 \| fine	70.647 \| fine	32.106 \| good	0.693 \| good	3.182 \| good	0.215 \| good
2025-07-31T21:00:00.000Z	66 \| moderate	17.339 \| fine	76.911 \| fine	30.079 \| good	0.679 \| good	3.215 \| good	0.218 \| good
2025-07-31T22:00:00.000Z	64 \| moderate	15.611 \| fine	69.374 \| fine	27.506 \| good	0.695 \| good	4.419 \| good	0.227 \| good
2025-07-31T23:00:00.000Z	58 \| moderate	12.928 \| fine	58.401 \| fine	25.28 \| good	0.711 \| good	5.624 \| good	0.236 \| good
2025-08-01T00:00:00.000Z	60 \| moderate	13.927 \| fine	62.911 \| fine	29.442 \| good	0.726 \| good	6.829 \| good	0.245 \| good
2025-08-01T01:00:00.000Z	56 \| moderate	11.914 \| good	53.287 \| good	29.689 \| good	0.744 \| good	6.627 \| good	0.24 \| good
2025-08-01T02:00:00.000Z	54 \| moderate	11.35 \| good	50.589 \| good	27.121 \| good	0.762 \| good	6.426 \| good	0.234 \| good
2025-08-01T03:00:00.000Z	58 \| moderate	13.015 \| fine	58.175 \| fine	24.708 \| good	0.779 \| good	6.225 \| good	0.229 \| good
2025-08-01T04:00:00.000Z	58 \| moderate	13.468 \| fine	60.422 \| fine	26.395 \| good	0.762 \| good	5.736 \| good	0.232 \| good
2025-08-01T05:00:00.000Z	64 \| moderate	16.438 \| fine	72.817 \| fine	26.352 \| good	0.746 \| good	5.247 \| good	0.236 \| good
2025-08-01T06:00:00.000Z	49 \| good	9.2 \| good	9.965 \| good	38.472 \| good	0.729 \| good	4.765 \| good	0.242 \| good
2025-08-01T07:00:00.000Z	60 \| moderate	14.121 \| fine	63.395 \| fine	24.815 \| good	0.704 \| good	4.39 \| good	0.24 \| good
2025-08-01T08:00:00.000Z	62 \| moderate	15.337 \| fine	68.317 \| fine	23.602 \| good	0.68 \| good	4.023 \| good	0.24 \| good

Greenwich

Get reliable air quality data to drive your business

Greenwich, Connecticut air quality map: Track AQI near you

0.29ppm

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 11:00:00 on 2025-07-29.

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 07:00:00 on 2025-07-30.

What is the current air quality in Greenwich, Connecticut?

The current air quality in Greenwich, Connecticut is 60, 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 14.468 μg/m³.

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

The current PM₁₀ concentration at Greenwich, Connecticut is 57.848 μg/m³.

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

The current carbon monoxide (CO) concentration at Greenwich, Connecticut is 0.282 ppm.

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

The current sulfur dioxide (SO₂) concentration at Greenwich, Connecticut is 2.008 ppb.

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

The current ozone (O₃) concentration at Greenwich, Connecticut is 43.157 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Greenwich, Connecticut is 20.828 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-07-28T12:00:00.000Z	38 \| good	7.429 \| good	30.487 \| good	24.844 \| good	0.646 \| good	16.488 \| good	0.377 \| good
2025-07-28T13:00:00.000Z	52 \| moderate	10.242 \| good	43.388 \| good	29.29 \| good	0.462 \| good	8.418 \| good	0.394 \| good
2025-07-28T14:00:00.000Z	52 \| moderate	10.421 \| good	46.259 \| good	29.773 \| good	0.446 \| good	10.643 \| good	0.384 \| good
2025-07-28T15:00:00.000Z	52 \| moderate	9.546 \| good	27.552 \| good	29.683 \| good	0.409 \| good	12.403 \| good	0.291 \| good
2025-07-28T16:00:00.000Z	44 \| good	8.46 \| good	32.11 \| good	38.017 \| good	0.496 \| good	9.439 \| good	0.236 \| good
2025-07-28T17:00:00.000Z	49 \| good	9.366 \| good	40.253 \| good	38.915 \| good	0.523 \| good	6.196 \| good	0.237 \| good
2025-07-28T18:00:00.000Z	54 \| moderate	10.781 \| good	48.936 \| good	45.567 \| good	0.595 \| good	6.265 \| good	0.253 \| good
2025-07-28T19:00:00.000Z	54 \| moderate	11.452 \| good	50.324 \| good	49.475 \| good	0.382 \| good	4.536 \| good	0.237 \| good
2025-07-28T20:00:00.000Z	56 \| moderate	11.563 \| good	42.034 \| good	52.472 \| good	0.463 \| good	4.95 \| good	0.26 \| good
2025-07-28T21:00:00.000Z	50 \| good	8.663 \| good	36.489 \| good	53.663 \| good	0.515 \| good	4.66 \| good	0.267 \| good
2025-07-28T22:00:00.000Z	49 \| good	8.545 \| good	28.043 \| good	48.938 \| good	0.397 \| good	5.423 \| good	0.267 \| good
2025-07-28T23:00:00.000Z	54 \| moderate	10.64 \| good	45.963 \| good	47.456 \| good	0.431 \| good	7.097 \| good	0.276 \| good
2025-07-29T00:00:00.000Z	52 \| moderate	10.054 \| good	35.936 \| good	45.297 \| good	0.47 \| good	3.903 \| good	0.33 \| good
2025-07-29T01:00:00.000Z	56 \| moderate	12.307 \| fine	34.521 \| good	44.032 \| good	0.452 \| good	3.839 \| good	0.327 \| good
2025-07-29T02:00:00.000Z	60 \| moderate	14.349 \| fine	36.27 \| good	34.238 \| good	0.542 \| good	13.942 \| good	0.389 \| good
2025-07-29T03:00:00.000Z	58 \| moderate	12.695 \| fine	50.264 \| good	32.922 \| good	0.84 \| good	10.439 \| good	0.422 \| good
2025-07-29T04:00:00.000Z	62 \| moderate	14.784 \| fine	53.302 \| good	32.922 \| good	0.708 \| good	11.96 \| good	0.451 \| good
2025-07-29T05:00:00.000Z	60 \| moderate	13.744 \| fine	38.843 \| good	33.057 \| good	1.111 \| good	15.675 \| good	0.491 \| good
2025-07-29T06:00:00.000Z	62 \| moderate	15.491 \| fine	66.054 \| fine	24.383 \| good	1.194 \| good	16.505 \| good	0.427 \| good
2025-07-29T07:00:00.000Z	64 \| moderate	15.535 \| fine	61.969 \| fine	19.512 \| good	1.214 \| good	12.622 \| good	0.481 \| good
2025-07-29T08:00:00.000Z	60 \| moderate	14.248 \| fine	63.012 \| fine	16.918 \| good	1.209 \| good	13.262 \| good	0.481 \| good
2025-07-29T09:00:00.000Z	60 \| moderate	13.547 \| fine	56.517 \| fine	15.812 \| good	1.214 \| good	11.015 \| good	0.427 \| good
2025-07-29T10:00:00.000Z	60 \| moderate	13.822 \| fine	50.371 \| good	9.996 \| good	1.236 \| good	12.59 \| good	0.508 \| good
2025-07-29T11:00:00.000Z	66 \| moderate	16.939 \| fine	62.232 \| fine	6.648 \| good	1.233 \| good	24.857 \| good	0.566 \| good
2025-07-29T12:00:00.000Z	67 \| moderate	17.523 \| fine	76.242 \| fine	8.293 \| good	1.31 \| good	22.94 \| good	0.514 \| good
2025-07-29T13:00:00.000Z	64 \| moderate	15.749 \| fine	72.58 \| fine	9.82 \| good	1.508 \| good	26.505 \| good	0.616 \| good
2025-07-29T14:00:00.000Z	69 \| moderate	18.929 \| fine	78.21 \| fine	16.633 \| good	1.168 \| good	31.582 \| good	0.514 \| good
2025-07-29T15:00:00.000Z	62 \| moderate	15.319 \| fine	39.566 \| good	23.206 \| good	1.11 \| good	19.604 \| good	0.456 \| good
2025-07-29T16:00:00.000Z	66 \| moderate	16.876 \| fine	49.253 \| good	30.161 \| good	1.149 \| good	12.297 \| good	0.342 \| good
2025-07-29T17:00:00.000Z	66 \| moderate	16.755 \| fine	60.568 \| fine	41.715 \| good	1.037 \| good	8.149 \| good	0.29 \| good
2025-07-29T18:00:00.000Z	84 \| moderate	14.536 \| fine	60.493 \| fine	65.006 \| fine	0.946 \| good	7.756 \| good	0.339 \| good
2025-07-29T19:00:00.000Z	101 \| sensitive	14.869 \| fine	51.939 \| good	70.768 \| fine	0.651 \| good	7.993 \| good	0.33 \| good
2025-07-29T20:00:00.000Z	101 \| sensitive	14.951 \| fine	67.225 \| fine	71.349 \| moderate	1.376 \| good	11.148 \| good	0.351 \| good
2025-07-29T21:00:00.000Z	126 \| sensitive	12.032 \| good	42.189 \| good	77.639 \| moderate	1.557 \| good	10.907 \| good	0.339 \| good
2025-07-29T22:00:00.000Z	126 \| sensitive	10.125 \| good	37.153 \| good	77.893 \| moderate	1.605 \| good	9.333 \| good	0.339 \| good
2025-07-29T23:00:00.000Z	151 \| unhealthy	12.715 \| fine	50.508 \| good	86.251 \| poor	1.821 \| good	3.084 \| good	0.387 \| good
2025-07-30T00:00:00.000Z	129 \| sensitive	14.111 \| fine	53.904 \| good	79.453 \| moderate	1.548 \| good	3.92 \| good	0.387 \| good
2025-07-30T01:00:00.000Z	115 \| sensitive	13.879 \| fine	60.352 \| fine	74.895 \| moderate	1.626 \| good	8.328 \| good	0.284 \| good
2025-07-30T02:00:00.000Z	119 \| sensitive	13.754 \| fine	44.202 \| good	75.608 \| moderate	1.793 \| good	9.32 \| good	0.327 \| good
2025-07-30T03:00:00.000Z	66 \| moderate	16.921 \| fine	74.832 \| fine	26.909 \| good	1.528 \| good	14.917 \| good	0.304 \| good
2025-07-30T04:00:00.000Z	64 \| moderate	12.42 \| fine	47.97 \| good	58.792 \| fine	2.075 \| good	9.921 \| good	0.317 \| good
2025-07-30T05:00:00.000Z	66 \| moderate	16.877 \| fine	78.768 \| fine	56.735 \| fine	2.06 \| good	13.167 \| good	0.337 \| good
2025-07-30T06:00:00.000Z	62 \| moderate	14.959 \| fine	50.526 \| good	44.147 \| good	1.948 \| good	20.526 \| good	0.329 \| good
2025-07-30T07:00:00.000Z	60 \| moderate	14.29 \| fine	55.443 \| fine	43.313 \| good	1.843 \| good	20.341 \| good	0.277 \| good
2025-07-30T08:00:00.000Z	64 \| moderate	15.576 \| fine	65.489 \| fine	29.262 \| good	1.826 \| good	19.979 \| good	0.277 \| good
2025-07-30T09:00:00.000Z	54 \| moderate	10.824 \| good	44.721 \| good	30.685 \| good	1.3 \| good	25.858 \| good	0.276 \| good
2025-07-30T10:00:00.000Z	62 \| moderate	14.587 \| fine	65.149 \| fine	29.047 \| good	1.177 \| good	25.022 \| good	0.323 \| good
2025-07-30T11:00:00.000Z	62 \| moderate	14.713 \| fine	67 \| fine	30.152 \| good	1.28 \| good	26.053 \| good	0.323 \| good
2025-07-30T09:00:00.000Z	58 \| moderate	13.456 \| fine	60.463 \| fine	22.403 \| good	1.783 \| good	13.363 \| good	0.32 \| good
2025-07-30T10:00:00.000Z	66 \| moderate	17.459 \| fine	77.682 \| fine	20.844 \| good	1.892 \| good	12.591 \| good	0.318 \| good
2025-07-30T11:00:00.000Z	77 \| moderate	22.913 \| fine	100.39 \| fine	20.564 \| good	2 \| good	11.818 \| good	0.315 \| good
2025-07-30T12:00:00.000Z	71 \| moderate	19.949 \| fine	87.823 \| fine	29.127 \| good	2.109 \| good	11.046 \| good	0.313 \| good
2025-07-30T13:00:00.000Z	75 \| moderate	21.687 \| fine	94.99 \| fine	37.934 \| good	2.081 \| good	9.527 \| good	0.295 \| good
2025-07-30T14:00:00.000Z	82 \| moderate	25.632 \| fine	111.504 \| fine	47.961 \| good	2.054 \| good	8.008 \| good	0.277 \| good
2025-07-30T15:00:00.000Z	92 \| moderate	30.701 \| fine	133.224 \| fine	61.665 \| fine	2.026 \| good	6.488 \| good	0.259 \| good
2025-07-30T16:00:00.000Z	122 \| sensitive	29.968 \| fine	129.817 \| fine	77.253 \| moderate	2.013 \| good	5.192 \| good	0.246 \| good
2025-07-30T17:00:00.000Z	154 \| unhealthy	27.827 \| fine	120.639 \| fine	87.185 \| poor	1.999 \| good	3.896 \| good	0.233 \| good
2025-07-30T18:00:00.000Z	166 \| unhealthy	25.097 \| fine	109.116 \| fine	91.882 \| poor	1.986 \| good	2.599 \| good	0.22 \| good
2025-07-30T19:00:00.000Z	156 \| unhealthy	23.894 \| fine	104.342 \| fine	87.971 \| poor	1.898 \| good	2.595 \| good	0.214 \| good
2025-07-30T20:00:00.000Z	112 \| sensitive	21.198 \| fine	93.336 \| fine	74.405 \| moderate	1.81 \| good	2.591 \| good	0.209 \| good
2025-07-30T21:00:00.000Z	115 \| sensitive	22.117 \| fine	96.861 \| fine	75.368 \| moderate	1.722 \| good	2.587 \| good	0.204 \| good
2025-07-30T22:00:00.000Z	79 \| moderate	23.711 \| fine	103.46 \| fine	62.488 \| fine	1.697 \| good	3.882 \| good	0.212 \| good
2025-07-30T23:00:00.000Z	69 \| moderate	19.303 \| fine	85.075 \| fine	51.063 \| good	1.672 \| good	5.177 \| good	0.219 \| good
2025-07-31T00:00:00.000Z	71 \| moderate	20.422 \| fine	89.853 \| fine	46.737 \| good	1.646 \| good	6.472 \| good	0.227 \| good
2025-07-31T01:00:00.000Z	73 \| moderate	21.307 \| fine	93.412 \| fine	40.415 \| good	1.724 \| good	10.098 \| good	0.252 \| good
2025-07-31T02:00:00.000Z	77 \| moderate	22.737 \| fine	99.597 \| fine	38.799 \| good	1.802 \| good	13.724 \| good	0.277 \| good
2025-07-31T03:00:00.000Z	64 \| moderate	16.033 \| fine	71.402 \| fine	39.579 \| good	1.88 \| good	17.35 \| good	0.302 \| good
2025-07-31T04:00:00.000Z	56 \| moderate	11.773 \| good	52.096 \| good	38.598 \| good	1.736 \| good	17.042 \| good	0.298 \| good
2025-07-31T05:00:00.000Z	58 \| moderate	13.083 \| fine	58.654 \| fine	38.393 \| good	1.591 \| good	16.734 \| good	0.294 \| good
2025-07-31T06:00:00.000Z	49 \| good	8.881 \| good	39.192 \| good	40.514 \| good	1.447 \| good	16.427 \| good	0.29 \| good
2025-07-31T07:00:00.000Z	44 \| good	8.075 \| good	35.578 \| good	38.687 \| good	1.571 \| good	15.546 \| good	0.276 \| good
2025-07-31T08:00:00.000Z	49 \| good	8.88 \| good	39.104 \| good	34.584 \| good	1.695 \| good	14.666 \| good	0.263 \| good
2025-07-31T09:00:00.000Z	44 \| good	8.016 \| good	35.199 \| good	34.687 \| good	1.819 \| good	13.785 \| good	0.25 \| good
2025-07-31T10:00:00.000Z	56 \| moderate	12.145 \| fine	54.626 \| good	28.846 \| good	1.755 \| good	11.957 \| good	0.242 \| good
2025-07-31T11:00:00.000Z	64 \| moderate	15.621 \| fine	69.914 \| fine	28.799 \| good	1.691 \| good	10.129 \| good	0.233 \| good
2025-07-31T12:00:00.000Z	66 \| moderate	16.911 \| fine	75.039 \| fine	31.646 \| good	1.627 \| good	8.3 \| good	0.225 \| good
2025-07-31T13:00:00.000Z	67 \| moderate	18.019 \| fine	79.951 \| fine	38.856 \| good	1.359 \| good	7.377 \| good	0.221 \| good
2025-07-31T14:00:00.000Z	69 \| moderate	18.517 \| fine	81.919 \| fine	44.103 \| good	1.091 \| good	6.454 \| good	0.217 \| good
2025-07-31T15:00:00.000Z	66 \| moderate	16.651 \| fine	74.142 \| fine	45.106 \| good	0.823 \| good	5.531 \| good	0.213 \| good
2025-07-31T16:00:00.000Z	69 \| moderate	19.403 \| fine	85.642 \| fine	48.099 \| good	0.789 \| good	4.727 \| good	0.212 \| good
2025-07-31T17:00:00.000Z	69 \| moderate	19.226 \| fine	84.898 \| fine	47.559 \| good	0.755 \| good	3.922 \| good	0.211 \| good
2025-07-31T18:00:00.000Z	62 \| moderate	15.148 \| fine	67.545 \| fine	42.834 \| good	0.721 \| good	3.118 \| good	0.21 \| good
2025-07-31T19:00:00.000Z	62 \| moderate	14.836 \| fine	66.4 \| fine	38.367 \| good	0.707 \| good	3.15 \| good	0.212 \| good
2025-07-31T20:00:00.000Z	64 \| moderate	15.966 \| fine	70.647 \| fine	32.106 \| good	0.693 \| good	3.182 \| good	0.215 \| good
2025-07-31T21:00:00.000Z	66 \| moderate	17.339 \| fine	76.911 \| fine	30.079 \| good	0.679 \| good	3.215 \| good	0.218 \| good
2025-07-31T22:00:00.000Z	64 \| moderate	15.611 \| fine	69.374 \| fine	27.506 \| good	0.695 \| good	4.419 \| good	0.227 \| good
2025-07-31T23:00:00.000Z	58 \| moderate	12.928 \| fine	58.401 \| fine	25.28 \| good	0.711 \| good	5.624 \| good	0.236 \| good
2025-08-01T00:00:00.000Z	60 \| moderate	13.927 \| fine	62.911 \| fine	29.442 \| good	0.726 \| good	6.829 \| good	0.245 \| good
2025-08-01T01:00:00.000Z	56 \| moderate	11.914 \| good	53.287 \| good	29.689 \| good	0.744 \| good	6.627 \| good	0.24 \| good
2025-08-01T02:00:00.000Z	54 \| moderate	11.35 \| good	50.589 \| good	27.121 \| good	0.762 \| good	6.426 \| good	0.234 \| good
2025-08-01T03:00:00.000Z	58 \| moderate	13.015 \| fine	58.175 \| fine	24.708 \| good	0.779 \| good	6.225 \| good	0.229 \| good
2025-08-01T04:00:00.000Z	58 \| moderate	13.468 \| fine	60.422 \| fine	26.395 \| good	0.762 \| good	5.736 \| good	0.232 \| good
2025-08-01T05:00:00.000Z	64 \| moderate	16.438 \| fine	72.817 \| fine	26.352 \| good	0.746 \| good	5.247 \| good	0.236 \| good
2025-08-01T06:00:00.000Z	49 \| good	9.2 \| good	9.965 \| good	38.472 \| good	0.729 \| good	4.765 \| good	0.242 \| good
2025-08-01T07:00:00.000Z	60 \| moderate	14.121 \| fine	63.395 \| fine	24.815 \| good	0.704 \| good	4.39 \| good	0.24 \| good
2025-08-01T08:00:00.000Z	62 \| moderate	15.337 \| fine	68.317 \| fine	23.602 \| good	0.68 \| good	4.023 \| good	0.24 \| 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 PM2.5 in Greenwich, Connecticut?

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?

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