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

The current PM10 concentration at Greenwich, Connecticut is 10.621 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Greenwich, Connecticut is 0.148 ppb.

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

The current ozone (O3) concentration at Greenwich, Connecticut is 29.733 ppm.

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

The current nitrogen dioxide (NO2) concentration at Greenwich, Connecticut is 4.395 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 3.055 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)

3.06 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

10.62 μg/m³

155

255

425

605+

Ozone (O₃)

29.73 ppb

201

201+

Sulfur Dioxide (SO₂)

0.15 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

4.39 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.16 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
2026-02-10T10:00:00.000Z	33 \| good	6.437 \| good	25.772 \| good	12.253 \| good	0.408 \| good	17.162 \| good	0.461 \| good
2026-02-10T11:00:00.000Z	27 \| good	5.465 \| good	26.206 \| good	17.542 \| good	0.602 \| good	13.259 \| good	0.519 \| good
2026-02-10T12:00:00.000Z	44 \| good	7.703 \| good	24.464 \| good	12.794 \| good	0.611 \| good	12.971 \| good	0.582 \| good
2026-02-10T13:00:00.000Z	33 \| good	6.322 \| good	19.792 \| good	12.428 \| good	0.654 \| good	22.299 \| good	0.599 \| good
2026-02-10T14:00:00.000Z	44 \| good	7.942 \| good	39.405 \| good	12.741 \| good	1.083 \| good	18.429 \| good	0.57 \| good
2026-02-10T15:00:00.000Z	44 \| good	8.04 \| good	38.301 \| good	13.555 \| good	0.833 \| good	23.252 \| good	0.615 \| good
2026-02-10T16:00:00.000Z	44 \| good	7.882 \| good	32.545 \| good	10.925 \| good	1.142 \| good	37.684 \| good	0.636 \| good
2026-02-10T17:00:00.000Z	60 \| moderate	13.684 \| fine	43.765 \| good	15.377 \| good	1.043 \| good	37.568 \| good	0.701 \| good
2026-02-10T18:00:00.000Z	62 \| moderate	12.089 \| good	77.678 \| fine	15.921 \| good	1.119 \| good	33.23 \| good	0.715 \| good
2026-02-10T19:00:00.000Z	64 \| moderate	15.655 \| fine	67.312 \| fine	11.529 \| good	1.353 \| good	27.461 \| good	0.627 \| good
2026-02-10T20:00:00.000Z	69 \| moderate	19.104 \| fine	73.428 \| fine	15.242 \| good	1.502 \| good	30.615 \| good	0.615 \| good
2026-02-10T21:00:00.000Z	62 \| moderate	14.519 \| fine	49.738 \| good	17.713 \| good	1.375 \| good	32.218 \| good	0.633 \| good
2026-02-10T22:00:00.000Z	56 \| moderate	11.761 \| good	45.055 \| good	19.242 \| good	1.16 \| good	31.915 \| good	0.664 \| good
2026-02-10T23:00:00.000Z	31 \| good	4.716 \| good	15.1 \| good	22.083 \| good	0.772 \| good	32.985 \| good	0.466 \| good
2026-02-11T00:00:00.000Z	27 \| good	5.077 \| good	23.531 \| good	22.342 \| good	0.812 \| good	27.685 \| good	0.393 \| good
2026-02-11T01:00:00.000Z	52 \| moderate	9.619 \| good	16.976 \| good	20.789 \| good	1.132 \| good	28.734 \| good	0.358 \| good
2026-02-11T02:00:00.000Z	52 \| moderate	9.82 \| good	41.763 \| good	15.843 \| good	0.771 \| good	33.304 \| good	0.35 \| good
2026-02-11T03:00:00.000Z	52 \| moderate	10.093 \| good	28.818 \| good	15.322 \| good	0.727 \| good	34.658 \| good	0.367 \| good
2026-02-11T04:00:00.000Z	52 \| moderate	9.951 \| good	34.645 \| good	12.631 \| good	0.678 \| good	39.303 \| good	0.417 \| good
2026-02-11T05:00:00.000Z	56 \| moderate	12.054 \| good	37.798 \| good	12.456 \| good	0.6 \| good	39 \| good	0.434 \| good
2026-02-11T06:00:00.000Z	54 \| moderate	11.398 \| good	40.696 \| good	14.793 \| good	0.816 \| good	40.703 \| good	0.511 \| good
2026-02-11T07:00:00.000Z	60 \| moderate	14.335 \| fine	44.736 \| good	5.391 \| good	0.811 \| good	38.838 \| good	0.531 \| good
2026-02-11T08:00:00.000Z	64 \| moderate	16.382 \| fine	43.149 \| good	9.062 \| good	0.734 \| good	47.637 \| good	0.499 \| good
2026-02-11T09:00:00.000Z	62 \| moderate	14.756 \| fine	67.091 \| fine	6.742 \| good	0.57 \| good	45.531 \| good	0.515 \| good
2026-02-11T10:00:00.000Z	62 \| moderate	15.071 \| fine	71.678 \| fine	18.542 \| good	0.506 \| good	39.882 \| good	0.491 \| good
2026-02-11T11:00:00.000Z	77 \| moderate	22.655 \| fine	92.437 \| fine	14.149 \| good	0.646 \| good	35.302 \| good	0.434 \| good
2026-02-11T12:00:00.000Z	71 \| moderate	20.13 \| fine	87.276 \| fine	16.846 \| good	0.722 \| good	37.238 \| good	0.536 \| good
2026-02-11T13:00:00.000Z	71 \| moderate	19.733 \| fine	75.138 \| fine	15.674 \| good	0.755 \| good	36.19 \| good	0.573 \| good
2026-02-11T14:00:00.000Z	69 \| moderate	19.334 \| fine	69.574 \| fine	20.905 \| good	1.075 \| good	26.604 \| good	0.569 \| good
2026-02-11T15:00:00.000Z	75 \| moderate	21.846 \| fine	82.154 \| fine	23.263 \| good	0.673 \| good	22.108 \| good	0.523 \| good
2026-02-11T16:00:00.000Z	66 \| moderate	16.582 \| fine	68.025 \| fine	22.915 \| good	0.601 \| good	15.578 \| good	1.115 \| good
2026-02-11T17:00:00.000Z	73 \| moderate	20.577 \| fine	41.919 \| good	22.058 \| good	0.431 \| good	11.801 \| good	0.337 \| good
2026-02-11T18:00:00.000Z	54 \| moderate	11.339 \| good	40.657 \| good	27.166 \| good	0.287 \| good	11.639 \| good	0.268 \| good
2026-02-11T19:00:00.000Z	49 \| good	8.509 \| good	33.941 \| good	29.302 \| good	0.208 \| good	9.104 \| good	0.252 \| good
2026-02-11T20:00:00.000Z	38 \| good	7.259 \| good	29.157 \| good	29.016 \| good	0.345 \| good	7.643 \| good	0.229 \| good
2026-02-11T21:00:00.000Z	26 \| good	3.43 \| good	14.899 \| good	28.172 \| good	0.164 \| good	6.687 \| good	0.198 \| good
2026-02-11T22:00:00.000Z	26 \| good	4.308 \| good	14.443 \| good	27.538 \| good	0.202 \| good	6.509 \| good	0.181 \| good
2026-02-11T23:00:00.000Z	26 \| good	4.031 \| good	14.931 \| good	28.346 \| good	0.171 \| good	7.077 \| good	0.198 \| good
2026-02-12T00:00:00.000Z	23 \| good	3.818 \| good	11.901 \| good	25.363 \| good	0.225 \| good	6.225 \| good	0.181 \| good
2026-02-12T01:00:00.000Z	24 \| good	3.844 \| good	14.655 \| good	25.626 \| good	0.208 \| good	5.911 \| good	0.181 \| good
2026-02-12T02:00:00.000Z	24 \| good	3.207 \| good	15.358 \| good	25.766 \| good	0.176 \| good	5.438 \| good	0.181 \| good
2026-02-12T03:00:00.000Z	21 \| good	2.998 \| good	12.798 \| good	23.369 \| good	0.17 \| good	5.046 \| good	0.159 \| good
2026-02-12T04:00:00.000Z	23 \| good	2.897 \| good	14.56 \| good	24.946 \| good	0.229 \| good	4.738 \| good	0.173 \| good
2026-02-12T05:00:00.000Z	24 \| good	2.878 \| good	12.663 \| good	25.965 \| good	0.182 \| good	4.849 \| good	0.159 \| good
2026-02-12T06:00:00.000Z	25 \| good	3.66 \| good	15.313 \| good	27.474 \| good	0.156 \| good	4.44 \| good	0.159 \| good
2026-02-12T07:00:00.000Z	27 \| good	3.619 \| good	11.659 \| good	29.445 \| good	0.197 \| good	4.23 \| good	0.163 \| good
2026-02-12T08:00:00.000Z	27 \| good	3.464 \| good	17.13 \| good	28.839 \| good	0.13 \| good	4.247 \| good	0.159 \| good
2026-02-12T09:00:00.000Z	28 \| good	3.055 \| good	10.621 \| good	29.733 \| good	0.148 \| good	4.395 \| good	0.159 \| good
2026-02-12T09:00:00.000Z	28 \| good	3.055 \| good	10.621 \| good	29.733 \| good	0.148 \| good	4.395 \| good	0.159 \| good
2026-02-12T10:00:00.000Z	49 \| good	9.395 \| good	41.705 \| good	29.199 \| good	0.571 \| good	3.717 \| good	0.165 \| good
2026-02-12T11:00:00.000Z	38 \| good	6.79 \| good	30.106 \| good	30.041 \| good	0.576 \| good	4.413 \| good	0.165 \| good
2026-02-12T12:00:00.000Z	49 \| good	8.58 \| good	37.763 \| good	29.477 \| good	0.58 \| good	5.11 \| good	0.166 \| good
2026-02-12T13:00:00.000Z	38 \| good	7.314 \| good	32.145 \| good	30.199 \| good	0.556 \| good	4.264 \| good	0.162 \| good
2026-02-12T14:00:00.000Z	31 \| good	4.249 \| good	18.37 \| good	33.245 \| good	0.532 \| good	3.417 \| good	0.157 \| good
2026-02-12T15:00:00.000Z	31 \| good	2.854 \| good	11.624 \| good	33.891 \| good	0.508 \| good	2.571 \| good	0.153 \| good
2026-02-12T16:00:00.000Z	31 \| good	1.679 \| good	6.902 \| good	33.854 \| good	0.487 \| good	2.355 \| good	0.149 \| good
2026-02-12T17:00:00.000Z	34 \| good	1.853 \| good	7.576 \| good	37.384 \| good	0.466 \| good	2.139 \| good	0.146 \| good
2026-02-12T18:00:00.000Z	34 \| good	2.42 \| good	10.224 \| good	37.193 \| good	0.445 \| good	1.923 \| good	0.142 \| good
2026-02-12T19:00:00.000Z	34 \| good	3.696 \| good	16.13 \| good	36.991 \| good	0.465 \| good	2.439 \| good	0.143 \| good
2026-02-12T20:00:00.000Z	34 \| good	2.586 \| good	10.564 \| good	36.745 \| good	0.484 \| good	2.954 \| good	0.144 \| good
2026-02-12T21:00:00.000Z	33 \| good	1.11 \| good	4.399 \| good	36.45 \| good	0.503 \| good	3.47 \| good	0.146 \| good
2026-02-12T22:00:00.000Z	31 \| good	3.64 \| good	16 \| good	34.013 \| good	0.52 \| good	4.953 \| good	0.152 \| good
2026-02-12T23:00:00.000Z	31 \| good	4.407 \| good	19.153 \| good	32.746 \| good	0.537 \| good	6.436 \| good	0.159 \| good
2026-02-13T00:00:00.000Z	27 \| good	3.525 \| good	15.443 \| good	29.417 \| good	0.554 \| good	7.92 \| good	0.166 \| good
2026-02-13T01:00:00.000Z	26 \| good	3.948 \| good	17.018 \| good	28.413 \| good	0.543 \| good	7.642 \| good	0.165 \| good
2026-02-13T02:00:00.000Z	23 \| good	1.602 \| good	6.441 \| good	25.019 \| good	0.532 \| good	7.364 \| good	0.165 \| good
2026-02-13T03:00:00.000Z	22 \| good	2.397 \| good	9.626 \| good	23.905 \| good	0.521 \| good	7.086 \| good	0.164 \| good
2026-02-13T04:00:00.000Z	21 \| good	2.398 \| good	9.692 \| good	22.949 \| good	0.485 \| good	6.011 \| good	0.161 \| good
2026-02-13T05:00:00.000Z	22 \| good	2.428 \| good	10.072 \| good	23.52 \| good	0.449 \| good	4.936 \| good	0.159 \| good
2026-02-13T06:00:00.000Z	23 \| good	3.018 \| good	12.567 \| good	24.608 \| good	0.413 \| good	3.861 \| good	0.156 \| good
2026-02-13T07:00:00.000Z	24 \| good	2.434 \| good	10.079 \| good	25.772 \| good	0.413 \| good	3.713 \| good	0.154 \| good
2026-02-13T08:00:00.000Z	23 \| good	2.065 \| good	8.589 \| good	24.513 \| good	0.413 \| good	3.565 \| good	0.153 \| good
2026-02-13T09:00:00.000Z	19 \| good	2.103 \| good	8.546 \| good	20.503 \| good	0.413 \| good	3.417 \| good	0.151 \| good
2026-02-13T10:00:00.000Z	18 \| good	1.458 \| good	5.816 \| good	19.484 \| good	0.473 \| good	5.146 \| good	0.158 \| good
2026-02-13T11:00:00.000Z	19 \| good	1.751 \| good	7.373 \| good	21.383 \| good	0.534 \| good	6.876 \| good	0.165 \| good
2026-02-13T12:00:00.000Z	21 \| good	1.774 \| good	7.433 \| good	22.84 \| good	0.594 \| good	8.605 \| good	0.172 \| good
2026-02-13T13:00:00.000Z	25 \| good	1.638 \| good	6.575 \| good	26.593 \| good	0.696 \| good	8.246 \| good	0.18 \| good
2026-02-13T14:00:00.000Z	31 \| good	1.671 \| good	6.753 \| good	33.088 \| good	0.799 \| good	7.887 \| good	0.189 \| good
2026-02-13T15:00:00.000Z	32 \| good	1.716 \| good	7.02 \| good	35.124 \| good	0.902 \| good	7.528 \| good	0.197 \| good
2026-02-13T16:00:00.000Z	31 \| good	2.058 \| good	8.502 \| good	33.694 \| good	0.926 \| good	6.774 \| good	0.189 \| good
2026-02-13T17:00:00.000Z	33 \| good	2.405 \| good	10.018 \| good	36.383 \| good	0.951 \| good	6.02 \| good	0.182 \| good
2026-02-13T18:00:00.000Z	34 \| good	2.801 \| good	12.225 \| good	37.438 \| good	0.976 \| good	5.266 \| good	0.175 \| good
2026-02-13T19:00:00.000Z	34 \| good	5.098 \| good	22.223 \| good	36.937 \| good	1.005 \| good	6.248 \| good	0.178 \| good
2026-02-13T20:00:00.000Z	35 \| good	5.553 \| good	23.898 \| good	37.503 \| good	1.035 \| good	7.231 \| good	0.181 \| good
2026-02-13T21:00:00.000Z	32 \| good	3.81 \| good	16.657 \| good	35.321 \| good	1.065 \| good	8.213 \| good	0.184 \| good
2026-02-13T22:00:00.000Z	33 \| good	6.294 \| good	27.86 \| good	28.915 \| good	1.26 \| good	15.932 \| good	0.239 \| good
2026-02-13T23:00:00.000Z	29 \| good	4.514 \| good	19.64 \| good	30.58 \| good	1.455 \| good	23.651 \| good	0.293 \| good
2026-02-14T00:00:00.000Z	29 \| good	3.16 \| good	13.524 \| good	27.354 \| good	1.65 \| good	31.37 \| good	0.348 \| good
2026-02-14T01:00:00.000Z	28 \| good	5.171 \| good	22.674 \| good	25.158 \| good	1.548 \| good	29.68 \| good	0.332 \| good
2026-02-14T02:00:00.000Z	26 \| good	3.239 \| good	14.036 \| good	23.933 \| good	1.446 \| good	27.991 \| good	0.316 \| good
2026-02-14T03:00:00.000Z	25 \| good	1.702 \| good	6.98 \| good	24.368 \| good	1.344 \| good	26.302 \| good	0.3 \| good
2026-02-14T04:00:00.000Z	24 \| good	3.32 \| good	14.295 \| good	24.601 \| good	1.276 \| good	25.2 \| good	0.291 \| good
2026-02-14T05:00:00.000Z	27 \| good	5.438 \| good	23.811 \| good	19.234 \| good	1.208 \| good	24.099 \| good	0.282 \| good
2026-02-14T06:00:00.000Z	64 \| moderate	16.443 \| fine	16.731 \| good	18.124 \| good	1.117 \| good	22.826 \| good	0.274 \| good
2026-02-14T07:00:00.000Z	49 \| good	8.835 \| good	38.813 \| good	10.572 \| good	1.137 \| good	21.555 \| good	0.261 \| good
2026-02-14T08:00:00.000Z	52 \| moderate	9.926 \| good	44.057 \| good	12.492 \| good	1.134 \| good	20.113 \| good	0.251 \| good
2026-02-14T09:00:00.000Z	49 \| good	9.009 \| good	39.934 \| good	12.513 \| good	1.131 \| good	18.67 \| good	0.24 \| good

Greenwich

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Greenwich, Connecticut air quality map: Track AQI near you

0.19ppm

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 2026-02-11.

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 2026-02-12.

What is the current air quality in Greenwich, Connecticut?

The current air quality in Greenwich, Connecticut is 28, 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 3.055 μg/m³.

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

The current PM₁₀ concentration at Greenwich, Connecticut is 10.621 μg/m³.

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

The current carbon monoxide (CO) concentration at Greenwich, Connecticut is 0.159 ppm.

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

The current sulfur dioxide (SO₂) concentration at Greenwich, Connecticut is 0.148 ppb.

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

The current ozone (O₃) concentration at Greenwich, Connecticut is 29.733 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Greenwich, Connecticut is 4.395 ppb.

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