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Active Weather Warnings

Air Quality Alert

Weather in Danbury, Connecticut

09:08 PM

Now

73° F

Feels Like 73°

Precipitation 0 %

Wind 5 mph

Humidity 68 %

Today

Day 84°

Night 61°

Precipitation 0 %

Wind 4 mph

Danbury Weather Forecast Updated

Last updated on June 29, 2026 at 7:55 PM

Air Quality in Danbury

NOW

44 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 8.44 µg/m³

PM₁₀ 9.53 µg/m³

O₃ 0.048 ppm

NO₂ 2.5 ppb

SO₂ 0.4 ppb

CO 0.12 ppm

NH₃ 0.16 µg/m³

NO 0 µg/m³

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

NH₃ – Ammonia

NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 8.44 µg/m³

PM₁₀ – 9.53 µg/m³

O₃ – 93.69 µg/m³

NO₂ – 4.62 µg/m³

SO₂ – 0.94 µg/m³

CO – 133.15 µg/m³

NH₃ – 0.16 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Danbury

Air Quality Alert

Air Quality Alert issued June 29 at 3:03PM EDT by NWS Upton NY

Jun 29, 3:03 PM → Jun 30, 11:00 PM

The Connecticut Department of Energy and Environmental Protection
has issued an Air Quality Action Day for the following counties:

Fairfield, New Haven, and Middlesex.

from 11 AM to 11 PM EDT Tuesday.

An Air Quality Action Day means that Ground Level Ozone within the
region may approach or exceed unhealthy standards. For additional
information, please visit the Connecticut Department of Energy and
Environmental Protection Web site at http://www.ct.gov/deep/aqi

Updated: Jun 29, 7:55 PM Source: NWS Alert