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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 |  Waterbury | 57 |
| 2 | Wauregan | 55 |
| 3 | Oxford | 53 |
| 4 | East Hartford | 27 |
| 5 | Pomfret Center | 25 |
| 6 | New London | 19 |
| 7 | Clinton | 18 |
| 8 | Danbury | 18 |
| 9 | West Cornwall | 18 |
| 10 | West Torrington | 18 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
67 Contributors
See all
LIVE AQI CITY RANKING
Real-time Connecticut
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Milford | 0 |
| 2 | Guilford | 2 |
| 3 | Westport | 2 |
| 4 | Branford | 3 |
| 5 | Glastonbury | 4 |
| 6 | Somers | 4 |
| 7 | Tolland | 4 |
| 8 | North Stamford | 5 |
| 9 | Ridgefield | 5 |
| 10 | Greenwich | 6 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
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Unhealthy for sensitive groups
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News
The latest air quality news and resources.
Connecticut air quality data attribution
67Contributors
Government Contributor
- Clancy Nolan
1 station
- Peter
1 station
- Nibbles
1 station
- The Zs
1 station
- D&S
1 station
5 Individual Contributors
61 Anonymous contributors61 stations
61 Anonymous Contributors
Which is the most polluted city in Connecticut?
- Waterbury 57
- Wauregan 55
- Oxford 53
- Byram 32
- Pemberwick 32
- Glenville 31
- Cos Cob 29
- Old Greenwich 29
- Riverside 28
- Stratford 28
- East Hartford 27
- New Canaan 25
- Pomfret Center 25
- Darien 24
- East Norwalk 23
- New Fairfield 23
- Norwalk 23
- Wilton 23
- Bethel 22
- Canaan 22
- Easton 22
- Georgetown 22
- Kent 22
- New Milford 22
- New Preston 22
- Southport 22
- Washington 22
- Bethlehem Village 21
- Heritage Village 21
- Litchfield 21
- New Hartford Center 21
- Northwest Harwinton 21
- Oakville 21
- Plymouth 21
- Southbury 21
- Terryville 21
- Thomaston 21
- Torrington 21
- Watertown 21
- Winchester Center 21
- Woodbury Center 21
- Ansonia 20
- Bristol 20
- Canton Valley 20
- City of Milford (balance) 20
- Collinsville 20
- Derby 20
- Naugatuck 20
- North Granby 20
- Orange 20
- Prospect 20
- Seymour 20
- Wolcott 20
- Cheshire 19
- Cheshire Village 19
- New London 19
- Plainville 19
- Salmon Brook 19
- West Haven 19
- West Simsbury 19
- Woodmont 19
- Clinton 18
- Danbury 18
- Farmington 18
- North Haven 18
- Simsbury Center 18
- Weatogue 18
- West Cornwall 18
- West Torrington 18
- Woodbury 18
- Branford Center 17
- Ledyard 17
- Redding 17
- Tariffville 17
- Wallingford 17
- Wallingford Center 17
- Meriden 16
- New Britain 16
- Kensington 15
- Newington 15
- Newtown 15
- North Branford 15
- Sherman 15
- Suffield Depot 15
- Blue Hills 14
- Coventry Lake 14
- Cromwell 14
- Crystal Lake 14
- Durham 14
- East Haddam 14
- East Hampton 14
- East Windsor 14
- Ellington 14
- Glastonbury Center 14
- Guilford Center 14
- Hartford 14
- Hazardville 14
- Higganum 14
- Lake Pocotopaug 14
- Madison 14
- Madison Center 14
- Manchester 14
- Moodus 14
- Old Lyme 14
- Portland 14
- Rockville 14
- Sherwood Manor 14
- South Windsor 14
- Southwood Acres 14
- Stafford Springs 14
- Terramuggus 14
- Thompsonville 14
- Trumbull 14
- Wethersfield 14
- Windsor 14
- Windsor Locks 14
- Winsted 14
- Baltic 13
- Central Waterford 13
- Chester Center 13
- Colchester 13
- Conning Towers-Nautilus Park 13
- Deep River Center 13
- Essex Village 13
- Fairfield 13
- Gales Ferry 13
- Groton 13
- Long Hill 13
- Middletown 13
- Niantic 13
- Old Saybrook 13
- Old Saybrook Center 13
- Oxoboxo River 13
- Salem 13
- Saybrook Manor 13
- South Coventry 13
- South Windham 13
- Uncasville 13
- Westbrook Center 13
- Willimantic 13
- Bridgeport 12
- Montville Center 12
- Noank 12
- Poquonock Bridge 12
- Lisbon 11
- Mystic 11
- Old Mystic 11
- Southington 11
- Stafford 11
- Waterford 11
- Woodbridge 11
- Jewett City 10
- Middlebury 10
- Norwich 10
- Preston City 10
- Shelton 10
- Stamford 10
- Putnam 9
- Quinebaug 9
- South Woodstock 9
- Danielson 8
- East Brooklyn 8
- East Haven 8
- Hamden 8
- Killingly Center 8
- Mansfield City 8
- Moosup 8
- New Haven 8
- North Grosvenor Dale 8
- Pawcatuck 8
- Plainfield 8
- Plainfield Village 8
- Thompson 8
- Enfield 7
- Hebron 7
- Storrs 7
- Greenwich 6
- West Hartford 6
- Windham 6
- North Stamford 5
- Ridgefield 5
- Glastonbury 4
- Somers 4
- Tolland 4
- Branford 3
- Guilford 2
- Westport 2
- Milford 0
AQI US, Metric