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Live air quality index in Colchester, Connecticut today

Stay updated with real-time air quality in Colchester, Connecticut featuring accurate data on AQI, PM2.5, 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)

27

Good

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Colchester, Connecticut

Last updated: ... (Local time)

Major air pollutants in Colchester, Connecticut

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter2.5 (PM2.5)

4.58 μg/m³

0

12.1

35.5

55.5

250.5

500.5+

Particulate Matter10 (PM10)

15.97 μg/m³

0

55

155

255

425

605+

Ozone (O3)

25.33 ppb

0

55

71

86

201

201+

Sulfur Dioxide (SO2)

0.27 ppb

0

36

76

186

605

1005+

Nitrogen Dioxide (NO2)

5.71 ppb

0

54

101

361

1250

2050+

Carbon Monoxide (CO)

0.26 ppm

0

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

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Colchester, Connecticut

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Colchester, Connecticut air quality map: Real-time AQI near you




How accurate is Connecticut, USA air quality data?

Air quality measurements for Connecticut, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.


Frequently asked questions

How frequently is the air quality data for Colchester, Connecticut updated?

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Air quality data for Colchester, Connecticut is updated on an hourly basis.


When did Colchester, Connecticut experience the worst air quality in the last 24 hours?

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The worst air quality in Colchester, Connecticut was recorded at 01:00:00 on 2025-07-14.


When did Colchester, Connecticut have its best air quality in the last 24 hours?

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The best air quality in Colchester, Connecticut was recorded at 12:00:00 on 2025-07-13.


What is the real-time air quality index for Colchester, Connecticut?

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The real-time air quality index in Colchester, Connecticut is 23, currently categorized as Good.


Which pollutant is found most often in Colchester, Connecticut?

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The most common pollutant in Colchester, Connecticut is O3.


What can I do if the air quality in Colchester, Connecticut is poor?

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If the air quality in Colchester, Connecticut is poor, limit outdoor activities and use a mask to safeguard your health.


What are the current PM2.5 levels in Colchester, Connecticut?

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The measured PM2.5 levels in Colchester, Connecticut at present are 3.69 μg/m3.


What are the current PM10 levels at Colchester, Connecticut?

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The current PM10 levels in Colchester, Connecticut are 13.839 μg/m3.


What are the current carbon monoxide (CO) levels at Colchester, Connecticut?

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The current carbon monoxide (CO) level in Colchester, Connecticut is 0.344 ppm.


What are the current sulfur dioxide (SO2) levels at Colchester, Connecticut?

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The current sulfur dioxide (SO2) levels in Colchester, Connecticut are 0.236 ppb.


What are the current ozone (O3) levels at Colchester, Connecticut?

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The current ozone (O3) levels at Colchester, Connecticut is 25.47 ppm.


What are the current nitrogen dioxide (NO2) levels at Colchester, Connecticut?

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The current nitrogen dioxide (NO2) levels at Colchester, Connecticut is 4.957 ppb.


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