Connecticut air quality index (AQI) and PM2.5 air pollution

07:25, Apr 7 (local time)

Good

Moderate

Unhealthy for sensitive groups

Unhealthy

Very unhealthy

Hazardous

Connecticut AQI Ranking

US AQI

PM2.5

#MAJOR CITYUS AQI

1

34

2

32

3

26

4

Central Waterford

25

5

25

6

Conning Towers-Nautilus Park

25

7

Deep River Center

25

8

25

9

25

10

25

SEE WORLD AQI RANKING

Most polluted cities

See a ranking of 2019’s most polluted cities.

Most polluted countries

See a ranking of 2019’s most polluted countries.

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Connecticut air pollution by cities

Ansonia Baltic Bethel Bethlehem Village Blue Hills Branford Branford Center Bridgeport Bristol Byram Canaan Canton Valley Central Waterford Cheshire Cheshire Village Chester Center City of Milford (balance) Clinton Colchester Collinsville Conning Towers-Nautilus Park Cos Cob Coventry Lake Cromwell Crystal Lake Danbury Danielson Darien Deep River Center Derby Durham East Brooklyn East Haddam East Hampton East Hartford East Haven East Norwalk East Windsor Easton Ellington Enfield Essex Village Fairfield Farmington Gales Ferry Georgetown Glastonbury Glastonbury Center Glenville Greenwich Groton Guilford Guilford Center Hamden Hartford Hazardville Hebron Heritage Village Higganum Jewett City Kensington Kent Killingly Center Lake Pocotopaug Ledyard Lisbon Litchfield Long Hill Madison Madison Center Manchester Mansfield City Meriden Middlebury Middletown Milford Montville Center Moodus Moosup Mystic Naugatuck New Britain New Canaan New Fairfield New Hartford Center New Haven New London New Milford New Preston Newington Newtown Niantic Noank North Branford North Granby North Grosvenor Dale North Haven North Stamford Northwest Harwinton Norwalk Norwich Oakville Old Greenwich Old Mystic Old Saybrook Old Saybrook Center Orange Oxford Oxoboxo River Pawcatuck Pemberwick Plainfield Plainfield Village Plainville Plymouth Pomfret Center Poquonock Bridge Portland Preston City Prospect Putnam Quinebaug Ridgefield Riverside Rockville Salem Salmon Brook Saybrook Manor Seymour Shelton Sherman Sherwood Manor Simsbury Center Somers South Coventry South Windham South Windsor South Woodstock Southbury Southport Southwood Acres Stafford Stafford Springs Stamford Storrs Stratford Suffield Depot Tariffville Terramuggus Terryville Thomaston Thompson Thompsonville Tolland Torrington Trumbull Uncasville Wallingford Wallingford Center Washington Waterbury Waterford Watertown Wauregan Weatogue West Cornwall West Hartford West Haven West Simsbury West Torrington Westbrook Center Westport Wethersfield Willimantic Wilton Winchester Center Windham Windsor Windsor Locks Winsted Wolcott Woodbridge Woodbury Woodbury Center Woodmont

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