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

The current PM10 concentration at Greenwich, Connecticut is 21.967 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Greenwich, Connecticut is 0.771 ppb.

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

The current ozone (O3) concentration at Greenwich, Connecticut is 18.959 ppm.

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

The current nitrogen dioxide (NO2) concentration at Greenwich, Connecticut is 12.212 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)

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)

5.20 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

23.91 μg/m³

155

255

425

605+

Ozone (O₃)

46.48 ppb

201

201+

Sulfur Dioxide (SO₂)

0.29 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

5.94 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.25 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

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
2025-09-12T01:00:00.000Z	35 \| good	4.91 \| good	19.263 \| good	38.422 \| good	0.211 \| good	18.456 \| good	0.305 \| good
2025-09-12T02:00:00.000Z	31 \| good	4.469 \| good	24.238 \| good	34.295 \| good	0.22 \| good	16.899 \| good	0.304 \| good
2025-09-12T03:00:00.000Z	33 \| good	5.537 \| good	23.891 \| good	18.497 \| good	1.282 \| good	22.924 \| good	0.328 \| good
2025-09-12T04:00:00.000Z	29 \| good	5.28 \| good	18.329 \| good	31.368 \| good	0.461 \| good	14.426 \| good	0.398 \| good
2025-09-12T05:00:00.000Z	33 \| good	5.622 \| good	22.988 \| good	28.37 \| good	0.459 \| good	13.013 \| good	0.414 \| good
2025-09-12T06:00:00.000Z	27 \| good	5.078 \| good	21.353 \| good	25.634 \| good	0.535 \| good	13.345 \| good	0.398 \| good
2025-09-12T07:00:00.000Z	27 \| good	5.317 \| good	22.974 \| good	23.321 \| good	0.206 \| good	17.599 \| good	0.398 \| good
2025-09-12T08:00:00.000Z	38 \| good	6.594 \| good	23.825 \| good	22.654 \| good	0.248 \| good	14.723 \| good	0.32 \| good
2025-09-12T09:00:00.000Z	33 \| good	6.148 \| good	22.15 \| good	22.997 \| good	0.214 \| good	18.51 \| good	0.32 \| good
2025-09-12T10:00:00.000Z	33 \| good	6.08 \| good	26.304 \| good	25.166 \| good	0.228 \| good	16.472 \| good	0.274 \| good
2025-09-12T11:00:00.000Z	33 \| good	6.061 \| good	27.503 \| good	24.476 \| good	0.552 \| good	14.102 \| good	0.274 \| good
2025-09-12T12:00:00.000Z	33 \| good	6.441 \| good	27.861 \| good	26.692 \| good	0.417 \| good	14.328 \| good	0.281 \| good
2025-09-12T13:00:00.000Z	33 \| good	6.378 \| good	29.626 \| good	27.625 \| good	0.595 \| good	15.542 \| good	0.312 \| good
2025-09-12T14:00:00.000Z	33 \| good	5.891 \| good	24.908 \| good	27.291 \| good	0.509 \| good	6.973 \| good	0.242 \| good
2025-09-12T15:00:00.000Z	33 \| good	5.746 \| good	30.754 \| good	29.083 \| good	0.412 \| good	3.793 \| good	0.218 \| good
2025-09-12T16:00:00.000Z	33 \| good	5.75 \| good	24.638 \| good	29.019 \| good	0.235 \| good	3.257 \| good	0.218 \| good
2025-09-12T17:00:00.000Z	38 \| good	6.808 \| good	29.347 \| good	31.31 \| good	0.133 \| good	3.894 \| good	0.202 \| good
2025-09-12T18:00:00.000Z	38 \| good	6.529 \| good	31.147 \| good	35.376 \| good	0.217 \| good	3.451 \| good	0.202 \| good
2025-09-12T19:00:00.000Z	42 \| good	5.889 \| good	26.012 \| good	45.111 \| good	0.196 \| good	2.638 \| good	0.202 \| good
2025-09-12T20:00:00.000Z	42 \| good	5.454 \| good	24.592 \| good	45.111 \| good	0.231 \| good	4.338 \| good	0.202 \| good
2025-09-12T21:00:00.000Z	45 \| good	5.02 \| good	19.165 \| good	48.668 \| good	0.168 \| good	4.323 \| good	0.202 \| good
2025-09-12T22:00:00.000Z	48 \| good	7.312 \| good	28.737 \| good	52.214 \| good	0.319 \| good	2.732 \| good	0.265 \| good
2025-09-12T23:00:00.000Z	45 \| good	7.869 \| good	35.576 \| good	48.918 \| good	0.304 \| good	3.311 \| good	0.265 \| good
2025-09-13T00:00:00.000Z	44 \| good	7.707 \| good	23.729 \| good	48.365 \| good	0.139 \| good	7.517 \| good	0.32 \| good
2025-09-13T01:00:00.000Z	42 \| good	7.45 \| good	28.887 \| good	45.28 \| good	0.251 \| good	10.514 \| good	0.297 \| good
2025-09-13T02:00:00.000Z	39 \| good	7.133 \| good	23.601 \| good	41.777 \| good	0.218 \| good	12.581 \| good	0.297 \| good
2025-09-13T03:00:00.000Z	38 \| good	7.217 \| good	21.507 \| good	38.652 \| good	0.517 \| good	7.686 \| good	0.266 \| good
2025-09-13T04:00:00.000Z	38 \| good	7.377 \| good	16.111 \| good	38.652 \| good	0.53 \| good	6.107 \| good	0.266 \| good
2025-09-13T05:00:00.000Z	38 \| good	6.787 \| good	23.106 \| good	36.635 \| good	0.181 \| good	7.269 \| good	0.296 \| good
2025-09-13T06:00:00.000Z	38 \| good	6.881 \| good	25.507 \| good	35.187 \| good	0.199 \| good	9.078 \| good	0.272 \| good
2025-09-13T07:00:00.000Z	38 \| good	6.948 \| good	19.729 \| good	34.698 \| good	0.182 \| good	12.125 \| good	0.273 \| good
2025-09-13T08:00:00.000Z	44 \| good	7.631 \| good	19.855 \| good	32.321 \| good	0.58 \| good	11.508 \| good	0.321 \| good
2025-09-13T09:00:00.000Z	38 \| good	7.186 \| good	18.441 \| good	27.662 \| good	0.91 \| good	12.68 \| good	0.306 \| good
2025-09-13T10:00:00.000Z	44 \| good	7.725 \| good	21.967 \| good	18.959 \| good	0.771 \| good	12.212 \| good	0.335 \| good
2025-09-13T11:00:00.000Z	49 \| good	9.158 \| good	23.921 \| good	19.641 \| good	0.746 \| good	12.004 \| good	0.367 \| good
2025-09-13T12:00:00.000Z	52 \| moderate	9.511 \| good	32.12 \| good	12.808 \| good	0.259 \| good	14.508 \| good	0.352 \| good
2025-09-13T13:00:00.000Z	44 \| good	7.962 \| good	21.471 \| good	11.342 \| good	0.492 \| good	20.624 \| good	0.376 \| good
2025-09-13T14:00:00.000Z	38 \| good	7.191 \| good	23.554 \| good	12.823 \| good	0.546 \| good	11.183 \| good	0.335 \| good
2025-09-13T15:00:00.000Z	44 \| good	7.931 \| good	31.942 \| good	22.423 \| good	0.364 \| good	7.28 \| good	0.249 \| good
2025-09-13T16:00:00.000Z	44 \| good	7.772 \| good	33.176 \| good	26.595 \| good	0.425 \| good	4.735 \| good	0.249 \| good
2025-09-13T17:00:00.000Z	44 \| good	8.071 \| good	37.233 \| good	34.143 \| good	0.595 \| good	6.758 \| good	0.266 \| good
2025-09-13T18:00:00.000Z	44 \| good	8.179 \| good	34.41 \| good	40.372 \| good	0.427 \| good	6.261 \| good	0.304 \| good
2025-09-13T19:00:00.000Z	49 \| good	8.549 \| good	36.735 \| good	46.776 \| good	0.314 \| good	4.938 \| good	0.289 \| good
2025-09-13T20:00:00.000Z	46 \| good	7.205 \| good	28.764 \| good	49.701 \| good	0.414 \| good	4.748 \| good	0.249 \| good
2025-09-13T21:00:00.000Z	48 \| good	7.142 \| good	28.143 \| good	51.862 \| good	0.305 \| good	4.177 \| good	0.249 \| good
2025-09-13T22:00:00.000Z	48 \| good	7.153 \| good	27.623 \| good	52.236 \| good	0.293 \| good	4.973 \| good	0.249 \| good
2025-09-13T23:00:00.000Z	45 \| good	6.242 \| good	23.28 \| good	49.381 \| good	0.288 \| good	3.567 \| good	0.226 \| good
2025-09-14T00:00:00.000Z	43 \| good	5.195 \| good	23.907 \| good	46.48 \| good	0.291 \| good	5.944 \| good	0.249 \| good
2025-09-14T00:00:00.000Z	43 \| good	5.195 \| good	23.907 \| good	46.48 \| good	0.291 \| good	5.944 \| good	0.249 \| good
2025-09-13T12:00:00.000Z	52 \| moderate	9.532 \| good	42.342 \| good	20.527 \| good	1.88 \| good	15.624 \| good	0.257 \| good
2025-09-13T13:00:00.000Z	49 \| good	8.814 \| good	38.74 \| good	22.825 \| good	2.159 \| good	13.15 \| good	0.234 \| good
2025-09-13T14:00:00.000Z	33 \| good	6.481 \| good	28.53 \| good	25.768 \| good	2.439 \| good	10.676 \| good	0.211 \| good
2025-09-13T15:00:00.000Z	44 \| good	8.274 \| good	36.486 \| good	31.826 \| good	2.719 \| good	8.202 \| good	0.188 \| good
2025-09-13T16:00:00.000Z	52 \| moderate	10.225 \| good	45.341 \| good	40.564 \| good	2.434 \| good	6.939 \| good	0.186 \| good
2025-09-13T17:00:00.000Z	52 \| moderate	10.424 \| good	46.447 \| good	41.274 \| good	2.15 \| good	5.677 \| good	0.184 \| good
2025-09-13T18:00:00.000Z	60 \| moderate	13.517 \| fine	60.169 \| fine	46.568 \| good	1.866 \| good	4.414 \| good	0.182 \| good
2025-09-13T19:00:00.000Z	60 \| moderate	14.094 \| fine	63.266 \| fine	47.464 \| good	1.867 \| good	4.512 \| good	0.184 \| good
2025-09-13T20:00:00.000Z	49 \| good	9.445 \| good	42.08 \| good	45.979 \| good	1.868 \| good	4.611 \| good	0.186 \| good
2025-09-13T21:00:00.000Z	44 \| good	7.517 \| good	33.013 \| good	41.533 \| good	1.869 \| good	4.709 \| good	0.187 \| good
2025-09-13T22:00:00.000Z	38 \| good	6.787 \| good	30.173 \| good	36.894 \| good	1.861 \| good	7.64 \| good	0.206 \| good
2025-09-13T23:00:00.000Z	38 \| good	7.138 \| good	31.587 \| good	31.23 \| good	1.854 \| good	10.57 \| good	0.225 \| good
2025-09-14T00:00:00.000Z	38 \| good	7.044 \| good	31.159 \| good	31.323 \| good	1.846 \| good	13.501 \| good	0.243 \| good
2025-09-14T01:00:00.000Z	44 \| good	8.024 \| good	35.282 \| good	29.488 \| good	1.75 \| good	12.552 \| good	0.226 \| good
2025-09-14T02:00:00.000Z	49 \| good	9.092 \| good	40.219 \| good	26.482 \| good	1.654 \| good	11.603 \| good	0.208 \| good
2025-09-14T03:00:00.000Z	52 \| moderate	9.873 \| good	43.785 \| good	22.728 \| good	1.557 \| good	10.654 \| good	0.191 \| good
2025-09-14T04:00:00.000Z	49 \| good	8.964 \| good	39.701 \| good	20.487 \| good	1.65 \| good	10.677 \| good	0.188 \| good
2025-09-14T05:00:00.000Z	49 \| good	8.812 \| good	39.009 \| good	18.395 \| good	1.743 \| good	10.7 \| good	0.185 \| good
2025-09-14T06:00:00.000Z	54 \| moderate	10.911 \| good	48.011 \| good	14.415 \| good	1.836 \| good	10.724 \| good	0.182 \| good
2025-09-14T07:00:00.000Z	52 \| moderate	10.109 \| good	44.796 \| good	13.864 \| good	2.029 \| good	10.976 \| good	0.185 \| good
2025-09-14T08:00:00.000Z	56 \| moderate	12.233 \| fine	54.992 \| good	16.031 \| good	2.223 \| good	11.229 \| good	0.187 \| good
2025-09-14T09:00:00.000Z	60 \| moderate	13.958 \| fine	62.559 \| fine	11.162 \| good	2.417 \| good	11.482 \| good	0.19 \| good
2025-09-14T10:00:00.000Z	56 \| moderate	11.875 \| good	53.014 \| good	11.324 \| good	2.577 \| good	12.558 \| good	0.207 \| good
2025-09-14T11:00:00.000Z	60 \| moderate	14.13 \| fine	63.08 \| fine	12.577 \| good	2.736 \| good	13.635 \| good	0.224 \| good
2025-09-14T12:00:00.000Z	71 \| moderate	20.161 \| fine	88.702 \| fine	16.981 \| good	2.896 \| good	14.712 \| good	0.241 \| good
2025-09-14T13:00:00.000Z	67 \| moderate	18.443 \| fine	81.349 \| fine	20.999 \| good	3.009 \| good	12.548 \| good	0.239 \| good
2025-09-14T14:00:00.000Z	67 \| moderate	18.2 \| fine	80.81 \| fine	27.683 \| good	3.123 \| good	10.384 \| good	0.238 \| good
2025-09-14T15:00:00.000Z	71 \| moderate	20.052 \| fine	88.487 \| fine	36.524 \| good	3.236 \| good	8.22 \| good	0.236 \| good
2025-09-14T16:00:00.000Z	71 \| moderate	19.733 \| fine	87.385 \| fine	44.872 \| good	2.694 \| good	6.633 \| good	0.225 \| good
2025-09-14T17:00:00.000Z	71 \| moderate	20.078 \| fine	88.404 \| fine	51.676 \| good	2.151 \| good	5.046 \| good	0.214 \| good
2025-09-14T18:00:00.000Z	69 \| moderate	18.706 \| fine	82.453 \| fine	54.133 \| good	1.609 \| good	3.459 \| good	0.203 \| good
2025-09-14T19:00:00.000Z	69 \| moderate	18.603 \| fine	82.024 \| fine	51.568 \| good	1.369 \| good	3.401 \| good	0.2 \| good
2025-09-14T20:00:00.000Z	64 \| moderate	16.07 \| fine	71.669 \| fine	51.277 \| good	1.13 \| good	3.342 \| good	0.198 \| good
2025-09-14T21:00:00.000Z	67 \| moderate	17.722 \| fine	78.702 \| fine	49.004 \| good	0.89 \| good	3.283 \| good	0.195 \| good
2025-09-14T22:00:00.000Z	67 \| moderate	18.179 \| fine	80.462 \| fine	47.092 \| good	0.894 \| good	5.24 \| good	0.208 \| good
2025-09-14T23:00:00.000Z	62 \| moderate	15.369 \| fine	68.908 \| fine	46.154 \| good	0.899 \| good	7.197 \| good	0.221 \| good
2025-09-15T00:00:00.000Z	60 \| moderate	14.488 \| fine	64.925 \| fine	40.364 \| good	0.903 \| good	9.153 \| good	0.233 \| good
2025-09-15T01:00:00.000Z	62 \| moderate	14.676 \| fine	66.096 \| fine	37.771 \| good	0.89 \| good	9.252 \| good	0.23 \| good
2025-09-15T02:00:00.000Z	60 \| moderate	13.58 \| fine	61.254 \| fine	34.816 \| good	0.878 \| good	9.351 \| good	0.226 \| good
2025-09-15T03:00:00.000Z	56 \| moderate	11.698 \| good	52.451 \| good	27.172 \| good	0.866 \| good	9.45 \| good	0.222 \| good
2025-09-15T04:00:00.000Z	52 \| moderate	9.964 \| good	44.116 \| good	23.122 \| good	0.844 \| good	8.507 \| good	0.213 \| good
2025-09-15T05:00:00.000Z	44 \| good	7.756 \| good	34.093 \| good	22.185 \| good	0.822 \| good	7.563 \| good	0.203 \| good
2025-09-15T06:00:00.000Z	44 \| good	8.399 \| good	8.73 \| good	33.459 \| good	0.776 \| good	6.399 \| good	0.193 \| good
2025-09-15T07:00:00.000Z	38 \| good	6.708 \| good	29.359 \| good	21.017 \| good	0.813 \| good	5.933 \| good	0.19 \| good
2025-09-15T08:00:00.000Z	38 \| good	6.618 \| good	29.23 \| good	18.741 \| good	0.825 \| good	5.246 \| good	0.187 \| good
2025-09-15T09:00:00.000Z	38 \| good	7.302 \| good	32.132 \| good	16.478 \| good	0.836 \| good	4.559 \| good	0.183 \| good
2025-09-15T10:00:00.000Z	44 \| good	8.369 \| good	36.621 \| good	14.253 \| good	0.865 \| good	5.064 \| good	0.188 \| good
2025-09-15T11:00:00.000Z	44 \| good	8.214 \| good	35.949 \| good	12.695 \| good	0.893 \| good	5.569 \| good	0.194 \| good

Greenwich

Get reliable air quality data to drive your business

Greenwich, Connecticut air quality map: Track AQI near you

0.35ppm

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 2025-09-12.

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 04:00:00 on 2025-09-12.

What is the current air quality in Greenwich, Connecticut?

The current air quality in Greenwich, Connecticut is 44, 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 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 7.725 μg/m³.

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

The current PM₁₀ concentration at Greenwich, Connecticut is 21.967 μg/m³.

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

The current carbon monoxide (CO) concentration at Greenwich, Connecticut is 0.335 ppm.

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

The current sulfur dioxide (SO₂) concentration at Greenwich, Connecticut is 0.771 ppb.

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

The current ozone (O₃) concentration at Greenwich, Connecticut is 18.959 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Greenwich, Connecticut is 12.212 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-09-12T01:00:00.000Z	35 \| good	4.91 \| good	19.263 \| good	38.422 \| good	0.211 \| good	18.456 \| good	0.305 \| good
2025-09-12T02:00:00.000Z	31 \| good	4.469 \| good	24.238 \| good	34.295 \| good	0.22 \| good	16.899 \| good	0.304 \| good
2025-09-12T03:00:00.000Z	33 \| good	5.537 \| good	23.891 \| good	18.497 \| good	1.282 \| good	22.924 \| good	0.328 \| good
2025-09-12T04:00:00.000Z	29 \| good	5.28 \| good	18.329 \| good	31.368 \| good	0.461 \| good	14.426 \| good	0.398 \| good
2025-09-12T05:00:00.000Z	33 \| good	5.622 \| good	22.988 \| good	28.37 \| good	0.459 \| good	13.013 \| good	0.414 \| good
2025-09-12T06:00:00.000Z	27 \| good	5.078 \| good	21.353 \| good	25.634 \| good	0.535 \| good	13.345 \| good	0.398 \| good
2025-09-12T07:00:00.000Z	27 \| good	5.317 \| good	22.974 \| good	23.321 \| good	0.206 \| good	17.599 \| good	0.398 \| good
2025-09-12T08:00:00.000Z	38 \| good	6.594 \| good	23.825 \| good	22.654 \| good	0.248 \| good	14.723 \| good	0.32 \| good
2025-09-12T09:00:00.000Z	33 \| good	6.148 \| good	22.15 \| good	22.997 \| good	0.214 \| good	18.51 \| good	0.32 \| good
2025-09-12T10:00:00.000Z	33 \| good	6.08 \| good	26.304 \| good	25.166 \| good	0.228 \| good	16.472 \| good	0.274 \| good
2025-09-12T11:00:00.000Z	33 \| good	6.061 \| good	27.503 \| good	24.476 \| good	0.552 \| good	14.102 \| good	0.274 \| good
2025-09-12T12:00:00.000Z	33 \| good	6.441 \| good	27.861 \| good	26.692 \| good	0.417 \| good	14.328 \| good	0.281 \| good
2025-09-12T13:00:00.000Z	33 \| good	6.378 \| good	29.626 \| good	27.625 \| good	0.595 \| good	15.542 \| good	0.312 \| good
2025-09-12T14:00:00.000Z	33 \| good	5.891 \| good	24.908 \| good	27.291 \| good	0.509 \| good	6.973 \| good	0.242 \| good
2025-09-12T15:00:00.000Z	33 \| good	5.746 \| good	30.754 \| good	29.083 \| good	0.412 \| good	3.793 \| good	0.218 \| good
2025-09-12T16:00:00.000Z	33 \| good	5.75 \| good	24.638 \| good	29.019 \| good	0.235 \| good	3.257 \| good	0.218 \| good
2025-09-12T17:00:00.000Z	38 \| good	6.808 \| good	29.347 \| good	31.31 \| good	0.133 \| good	3.894 \| good	0.202 \| good
2025-09-12T18:00:00.000Z	38 \| good	6.529 \| good	31.147 \| good	35.376 \| good	0.217 \| good	3.451 \| good	0.202 \| good
2025-09-12T19:00:00.000Z	42 \| good	5.889 \| good	26.012 \| good	45.111 \| good	0.196 \| good	2.638 \| good	0.202 \| good
2025-09-12T20:00:00.000Z	42 \| good	5.454 \| good	24.592 \| good	45.111 \| good	0.231 \| good	4.338 \| good	0.202 \| good
2025-09-12T21:00:00.000Z	45 \| good	5.02 \| good	19.165 \| good	48.668 \| good	0.168 \| good	4.323 \| good	0.202 \| good
2025-09-12T22:00:00.000Z	48 \| good	7.312 \| good	28.737 \| good	52.214 \| good	0.319 \| good	2.732 \| good	0.265 \| good
2025-09-12T23:00:00.000Z	45 \| good	7.869 \| good	35.576 \| good	48.918 \| good	0.304 \| good	3.311 \| good	0.265 \| good
2025-09-13T00:00:00.000Z	44 \| good	7.707 \| good	23.729 \| good	48.365 \| good	0.139 \| good	7.517 \| good	0.32 \| good
2025-09-13T01:00:00.000Z	42 \| good	7.45 \| good	28.887 \| good	45.28 \| good	0.251 \| good	10.514 \| good	0.297 \| good
2025-09-13T02:00:00.000Z	39 \| good	7.133 \| good	23.601 \| good	41.777 \| good	0.218 \| good	12.581 \| good	0.297 \| good
2025-09-13T03:00:00.000Z	38 \| good	7.217 \| good	21.507 \| good	38.652 \| good	0.517 \| good	7.686 \| good	0.266 \| good
2025-09-13T04:00:00.000Z	38 \| good	7.377 \| good	16.111 \| good	38.652 \| good	0.53 \| good	6.107 \| good	0.266 \| good
2025-09-13T05:00:00.000Z	38 \| good	6.787 \| good	23.106 \| good	36.635 \| good	0.181 \| good	7.269 \| good	0.296 \| good
2025-09-13T06:00:00.000Z	38 \| good	6.881 \| good	25.507 \| good	35.187 \| good	0.199 \| good	9.078 \| good	0.272 \| good
2025-09-13T07:00:00.000Z	38 \| good	6.948 \| good	19.729 \| good	34.698 \| good	0.182 \| good	12.125 \| good	0.273 \| good
2025-09-13T08:00:00.000Z	44 \| good	7.631 \| good	19.855 \| good	32.321 \| good	0.58 \| good	11.508 \| good	0.321 \| good
2025-09-13T09:00:00.000Z	38 \| good	7.186 \| good	18.441 \| good	27.662 \| good	0.91 \| good	12.68 \| good	0.306 \| good
2025-09-13T10:00:00.000Z	44 \| good	7.725 \| good	21.967 \| good	18.959 \| good	0.771 \| good	12.212 \| good	0.335 \| good
2025-09-13T11:00:00.000Z	49 \| good	9.158 \| good	23.921 \| good	19.641 \| good	0.746 \| good	12.004 \| good	0.367 \| good
2025-09-13T12:00:00.000Z	52 \| moderate	9.511 \| good	32.12 \| good	12.808 \| good	0.259 \| good	14.508 \| good	0.352 \| good
2025-09-13T13:00:00.000Z	44 \| good	7.962 \| good	21.471 \| good	11.342 \| good	0.492 \| good	20.624 \| good	0.376 \| good
2025-09-13T14:00:00.000Z	38 \| good	7.191 \| good	23.554 \| good	12.823 \| good	0.546 \| good	11.183 \| good	0.335 \| good
2025-09-13T15:00:00.000Z	44 \| good	7.931 \| good	31.942 \| good	22.423 \| good	0.364 \| good	7.28 \| good	0.249 \| good
2025-09-13T16:00:00.000Z	44 \| good	7.772 \| good	33.176 \| good	26.595 \| good	0.425 \| good	4.735 \| good	0.249 \| good
2025-09-13T17:00:00.000Z	44 \| good	8.071 \| good	37.233 \| good	34.143 \| good	0.595 \| good	6.758 \| good	0.266 \| good
2025-09-13T18:00:00.000Z	44 \| good	8.179 \| good	34.41 \| good	40.372 \| good	0.427 \| good	6.261 \| good	0.304 \| good
2025-09-13T19:00:00.000Z	49 \| good	8.549 \| good	36.735 \| good	46.776 \| good	0.314 \| good	4.938 \| good	0.289 \| good
2025-09-13T20:00:00.000Z	46 \| good	7.205 \| good	28.764 \| good	49.701 \| good	0.414 \| good	4.748 \| good	0.249 \| good
2025-09-13T21:00:00.000Z	48 \| good	7.142 \| good	28.143 \| good	51.862 \| good	0.305 \| good	4.177 \| good	0.249 \| good
2025-09-13T22:00:00.000Z	48 \| good	7.153 \| good	27.623 \| good	52.236 \| good	0.293 \| good	4.973 \| good	0.249 \| good
2025-09-13T23:00:00.000Z	45 \| good	6.242 \| good	23.28 \| good	49.381 \| good	0.288 \| good	3.567 \| good	0.226 \| good
2025-09-14T00:00:00.000Z	43 \| good	5.195 \| good	23.907 \| good	46.48 \| good	0.291 \| good	5.944 \| good	0.249 \| good
2025-09-14T00:00:00.000Z	43 \| good	5.195 \| good	23.907 \| good	46.48 \| good	0.291 \| good	5.944 \| good	0.249 \| good
2025-09-13T12:00:00.000Z	52 \| moderate	9.532 \| good	42.342 \| good	20.527 \| good	1.88 \| good	15.624 \| good	0.257 \| good
2025-09-13T13:00:00.000Z	49 \| good	8.814 \| good	38.74 \| good	22.825 \| good	2.159 \| good	13.15 \| good	0.234 \| good
2025-09-13T14:00:00.000Z	33 \| good	6.481 \| good	28.53 \| good	25.768 \| good	2.439 \| good	10.676 \| good	0.211 \| good
2025-09-13T15:00:00.000Z	44 \| good	8.274 \| good	36.486 \| good	31.826 \| good	2.719 \| good	8.202 \| good	0.188 \| good
2025-09-13T16:00:00.000Z	52 \| moderate	10.225 \| good	45.341 \| good	40.564 \| good	2.434 \| good	6.939 \| good	0.186 \| good
2025-09-13T17:00:00.000Z	52 \| moderate	10.424 \| good	46.447 \| good	41.274 \| good	2.15 \| good	5.677 \| good	0.184 \| good
2025-09-13T18:00:00.000Z	60 \| moderate	13.517 \| fine	60.169 \| fine	46.568 \| good	1.866 \| good	4.414 \| good	0.182 \| good
2025-09-13T19:00:00.000Z	60 \| moderate	14.094 \| fine	63.266 \| fine	47.464 \| good	1.867 \| good	4.512 \| good	0.184 \| good
2025-09-13T20:00:00.000Z	49 \| good	9.445 \| good	42.08 \| good	45.979 \| good	1.868 \| good	4.611 \| good	0.186 \| good
2025-09-13T21:00:00.000Z	44 \| good	7.517 \| good	33.013 \| good	41.533 \| good	1.869 \| good	4.709 \| good	0.187 \| good
2025-09-13T22:00:00.000Z	38 \| good	6.787 \| good	30.173 \| good	36.894 \| good	1.861 \| good	7.64 \| good	0.206 \| good
2025-09-13T23:00:00.000Z	38 \| good	7.138 \| good	31.587 \| good	31.23 \| good	1.854 \| good	10.57 \| good	0.225 \| good
2025-09-14T00:00:00.000Z	38 \| good	7.044 \| good	31.159 \| good	31.323 \| good	1.846 \| good	13.501 \| good	0.243 \| good
2025-09-14T01:00:00.000Z	44 \| good	8.024 \| good	35.282 \| good	29.488 \| good	1.75 \| good	12.552 \| good	0.226 \| good
2025-09-14T02:00:00.000Z	49 \| good	9.092 \| good	40.219 \| good	26.482 \| good	1.654 \| good	11.603 \| good	0.208 \| good
2025-09-14T03:00:00.000Z	52 \| moderate	9.873 \| good	43.785 \| good	22.728 \| good	1.557 \| good	10.654 \| good	0.191 \| good
2025-09-14T04:00:00.000Z	49 \| good	8.964 \| good	39.701 \| good	20.487 \| good	1.65 \| good	10.677 \| good	0.188 \| good
2025-09-14T05:00:00.000Z	49 \| good	8.812 \| good	39.009 \| good	18.395 \| good	1.743 \| good	10.7 \| good	0.185 \| good
2025-09-14T06:00:00.000Z	54 \| moderate	10.911 \| good	48.011 \| good	14.415 \| good	1.836 \| good	10.724 \| good	0.182 \| good
2025-09-14T07:00:00.000Z	52 \| moderate	10.109 \| good	44.796 \| good	13.864 \| good	2.029 \| good	10.976 \| good	0.185 \| good
2025-09-14T08:00:00.000Z	56 \| moderate	12.233 \| fine	54.992 \| good	16.031 \| good	2.223 \| good	11.229 \| good	0.187 \| good
2025-09-14T09:00:00.000Z	60 \| moderate	13.958 \| fine	62.559 \| fine	11.162 \| good	2.417 \| good	11.482 \| good	0.19 \| good
2025-09-14T10:00:00.000Z	56 \| moderate	11.875 \| good	53.014 \| good	11.324 \| good	2.577 \| good	12.558 \| good	0.207 \| good
2025-09-14T11:00:00.000Z	60 \| moderate	14.13 \| fine	63.08 \| fine	12.577 \| good	2.736 \| good	13.635 \| good	0.224 \| good
2025-09-14T12:00:00.000Z	71 \| moderate	20.161 \| fine	88.702 \| fine	16.981 \| good	2.896 \| good	14.712 \| good	0.241 \| good
2025-09-14T13:00:00.000Z	67 \| moderate	18.443 \| fine	81.349 \| fine	20.999 \| good	3.009 \| good	12.548 \| good	0.239 \| good
2025-09-14T14:00:00.000Z	67 \| moderate	18.2 \| fine	80.81 \| fine	27.683 \| good	3.123 \| good	10.384 \| good	0.238 \| good
2025-09-14T15:00:00.000Z	71 \| moderate	20.052 \| fine	88.487 \| fine	36.524 \| good	3.236 \| good	8.22 \| good	0.236 \| good
2025-09-14T16:00:00.000Z	71 \| moderate	19.733 \| fine	87.385 \| fine	44.872 \| good	2.694 \| good	6.633 \| good	0.225 \| good
2025-09-14T17:00:00.000Z	71 \| moderate	20.078 \| fine	88.404 \| fine	51.676 \| good	2.151 \| good	5.046 \| good	0.214 \| good
2025-09-14T18:00:00.000Z	69 \| moderate	18.706 \| fine	82.453 \| fine	54.133 \| good	1.609 \| good	3.459 \| good	0.203 \| good
2025-09-14T19:00:00.000Z	69 \| moderate	18.603 \| fine	82.024 \| fine	51.568 \| good	1.369 \| good	3.401 \| good	0.2 \| good
2025-09-14T20:00:00.000Z	64 \| moderate	16.07 \| fine	71.669 \| fine	51.277 \| good	1.13 \| good	3.342 \| good	0.198 \| good
2025-09-14T21:00:00.000Z	67 \| moderate	17.722 \| fine	78.702 \| fine	49.004 \| good	0.89 \| good	3.283 \| good	0.195 \| good
2025-09-14T22:00:00.000Z	67 \| moderate	18.179 \| fine	80.462 \| fine	47.092 \| good	0.894 \| good	5.24 \| good	0.208 \| good
2025-09-14T23:00:00.000Z	62 \| moderate	15.369 \| fine	68.908 \| fine	46.154 \| good	0.899 \| good	7.197 \| good	0.221 \| good
2025-09-15T00:00:00.000Z	60 \| moderate	14.488 \| fine	64.925 \| fine	40.364 \| good	0.903 \| good	9.153 \| good	0.233 \| good
2025-09-15T01:00:00.000Z	62 \| moderate	14.676 \| fine	66.096 \| fine	37.771 \| good	0.89 \| good	9.252 \| good	0.23 \| good
2025-09-15T02:00:00.000Z	60 \| moderate	13.58 \| fine	61.254 \| fine	34.816 \| good	0.878 \| good	9.351 \| good	0.226 \| good
2025-09-15T03:00:00.000Z	56 \| moderate	11.698 \| good	52.451 \| good	27.172 \| good	0.866 \| good	9.45 \| good	0.222 \| good
2025-09-15T04:00:00.000Z	52 \| moderate	9.964 \| good	44.116 \| good	23.122 \| good	0.844 \| good	8.507 \| good	0.213 \| good
2025-09-15T05:00:00.000Z	44 \| good	7.756 \| good	34.093 \| good	22.185 \| good	0.822 \| good	7.563 \| good	0.203 \| good
2025-09-15T06:00:00.000Z	44 \| good	8.399 \| good	8.73 \| good	33.459 \| good	0.776 \| good	6.399 \| good	0.193 \| good
2025-09-15T07:00:00.000Z	38 \| good	6.708 \| good	29.359 \| good	21.017 \| good	0.813 \| good	5.933 \| good	0.19 \| good
2025-09-15T08:00:00.000Z	38 \| good	6.618 \| good	29.23 \| good	18.741 \| good	0.825 \| good	5.246 \| good	0.187 \| good
2025-09-15T09:00:00.000Z	38 \| good	7.302 \| good	32.132 \| good	16.478 \| good	0.836 \| good	4.559 \| good	0.183 \| good
2025-09-15T10:00:00.000Z	44 \| good	8.369 \| good	36.621 \| good	14.253 \| good	0.865 \| good	5.064 \| good	0.188 \| good
2025-09-15T11:00:00.000Z	44 \| good	8.214 \| good	35.949 \| good	12.695 \| good	0.893 \| good	5.569 \| good	0.194 \| 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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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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