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Air quality in Connecticut
Air quality index (AQI) and PM2.5 air pollution in Connecticut
LIVE AQI CITY RANKING
Real-time Connecticut
Most polluted city ranking
| # | city | US AQI |
|---|---|---|
| 1 |  Waterford | 28 |
| 2 | West Cornwall | 24 |
| 3 | West Torrington | 24 |
| 4 | Ridgefield | 23 |
| 5 | Danbury | 21 |
| 6 | New London | 21 |
| 7 | North Stamford | 21 |
| 8 | Bridgeport | 19 |
| 9 | Groton | 19 |
| 10 | Old Greenwich | 19 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
70 Contributors
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LIVE AQI CITY RANKING
Real-time Connecticut
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Hebron | 2 |
| 2 | Milford | 5 |
| 3 | Guilford | 7 |
| 4 | Middlebury | 7 |
| 5 | Branford | 8 |
| 6 | Clinton | 8 |
| 7 | West Hartford | 8 |
| 8 | Oxford | 9 |
| 9 | Storrs | 9 |
| 10 | Greenwich | 10 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
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News
The latest air quality news and resources.
Connecticut air quality data attribution
70Contributors
Government Contributor
- Clancy Nolan
1 station
- Peter
1 station
- Nibbles
1 station
- The Zs
1 station
- D&S
1 station
5 Individual Contributors
64 Anonymous contributors64 stations
64 Anonymous Contributors
Which is the most polluted city in Connecticut?
- Stratford 28
- Waterford 28
- Pomfret Center 26
- West Cornwall 24
- West Torrington 24
- Ridgefield 23
- Danbury 21
- New London 21
- North Stamford 21
- Kent 20
- Bethel 19
- Bethlehem Village 19
- Bridgeport 19
- Groton 19
- Heritage Village 19
- New Fairfield 19
- New Milford 19
- New Preston 19
- Old Greenwich 19
- Southbury 19
- Washington 19
- Woodbury Center 19
- Bristol 18
- Canaan 18
- Collinsville 18
- Georgetown 18
- Glenville 18
- Hartford 18
- Litchfield 18
- New Hartford Center 18
- North Grosvenor Dale 18
- Northwest Harwinton 18
- Oakville 18
- Plymouth 18
- Putnam 18
- Quinebaug 18
- South Woodstock 18
- Terryville 18
- Thomaston 18
- Thompson 18
- Torrington 18
- Waterbury 18
- Watertown 18
- Winchester Center 18
- Wolcott 18
- Woodbridge 18
- Baltic 17
- Byram 17
- Canton Valley 17
- Colchester 17
- Cos Cob 17
- Coventry Lake 17
- Crystal Lake 17
- Danielson 17
- East Brooklyn 17
- East Windsor 17
- Ellington 17
- Farmington 17
- Glastonbury Center 17
- Killingly Center 17
- Lisbon 17
- Manchester 17
- Naugatuck 17
- New Canaan 17
- Newington 17
- Pemberwick 17
- Plainville 17
- Riverside 17
- Rockville 17
- Simsbury Center 17
- South Coventry 17
- South Windham 17
- South Windsor 17
- Stafford 17
- Stafford Springs 17
- Terramuggus 17
- Trumbull 17
- Weatogue 17
- West Simsbury 17
- Wethersfield 17
- Willimantic 17
- Wilton 17
- Windsor 17
- Blue Hills 16
- Cromwell 16
- Darien 16
- East Hampton 16
- East Hartford 16
- East Norwalk 16
- Easton 16
- Hazardville 16
- Jewett City 16
- Kensington 16
- Lake Pocotopaug 16
- Moosup 16
- New Britain 16
- Newtown 16
- North Granby 16
- Norwalk 16
- Plainfield 16
- Plainfield Village 16
- Portland 16
- Prospect 16
- Salem 16
- Salmon Brook 16
- Seymour 16
- Sherwood Manor 16
- Southwood Acres 16
- Stamford 16
- Suffield Depot 16
- Tariffville 16
- Thompsonville 16
- Windsor Locks 16
- Woodbury 16
- Ansonia 15
- Cheshire 15
- Cheshire Village 15
- City of Milford (balance) 15
- Derby 15
- East Haven 15
- Higganum 15
- Ledyard 15
- Meriden 15
- Moodus 15
- Preston City 15
- Shelton 15
- Southport 15
- Wallingford 15
- Windham 15
- Winsted 15
- Conning Towers-Nautilus Park 14
- Durham 14
- East Haddam 14
- Enfield 14
- Fairfield 14
- Gales Ferry 14
- Glastonbury 14
- Montville Center 14
- North Haven 14
- Old Lyme 14
- Orange 14
- Oxoboxo River 14
- Sherman 14
- Uncasville 14
- Wallingford Center 14
- Wauregan 14
- Woodmont 14
- Branford Center 13
- Central Waterford 13
- Chester Center 13
- Deep River Center 13
- Essex Village 13
- Guilford Center 13
- Hamden 13
- Long Hill 13
- Madison 13
- Madison Center 13
- Mansfield City 13
- Mystic 13
- New Haven 13
- Niantic 13
- Noank 13
- North Branford 13
- Old Mystic 13
- Old Saybrook 13
- Old Saybrook Center 13
- Poquonock Bridge 13
- Saybrook Manor 13
- Southington 13
- West Haven 13
- Westbrook Center 13
- Middletown 12
- Pawcatuck 12
- Redding 12
- Westport 12
- Tolland 11
- Greenwich 10
- Norwich 10
- Somers 10
- Oxford 9
- Storrs 9
- Branford 8
- Clinton 8
- West Hartford 8
- Guilford 7
- Middlebury 7
- Milford 5
- Hebron 2
AQI US, Metric