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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 |  East Haven | 61 |
| 2 | Tolland | 60 |
| 3 | Enfield | 56 |
| 4 | Waterbury | 56 |
| 5 | East Hartford | 54 |
| 6 | Farmington | 54 |
| 7 | Storrs | 54 |
| 8 | Danbury | 53 |
| 9 | Hamden | 53 |
| 10 | New London | 53 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
70 Contributors
See all
LIVE AQI CITY RANKING
Real-time Connecticut
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Guilford | 20 |
| 2 | Middlebury | 29 |
| 3 | Winsted | 29 |
| 4 | Sherman | 30 |
| 5 | West Cornwall | 31 |
| 6 | West Torrington | 32 |
| 7 | Greenwich | 33 |
| 8 | North Stamford | 33 |
| 9 | Ridgefield | 33 |
| 10 | Somers | 33 |
(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
- EPA Office of Atmospheric Protection
1 station
3 Government Contributors
- AirGradient
1 station
Corporate Contributor
- Clancy Nolan
1 station
- Peter
1 station
- Nibbles
1 station
- The Zs
1 station
D&S1 station
5 Individual Contributors
61 Anonymous contributors61 stations
61 Anonymous Contributors
Which is the most polluted city in Connecticut?
- East Haven 61
- Tolland 60
- Enfield 56
- Waterbury 56
- Byram 55
- Cos Cob 55
- Darien 55
- Deep River Center 55
- East Norwalk 55
- Essex Village 55
- Glenville 55
- Guilford Center 55
- Madison 55
- Madison Center 55
- Niantic 55
- Norwalk 55
- Old Lyme 55
- Old Saybrook 55
- Old Saybrook Center 55
- Pemberwick 55
- Riverside 55
- Saybrook Manor 55
- Southport 55
- Westbrook Center 55
- Baltic 54
- Branford Center 54
- Central Waterford 54
- Chester Center 54
- City of Milford (balance) 54
- Colchester 54
- Conning Towers-Nautilus Park 54
- Danielson 54
- Durham 54
- East Brooklyn 54
- East Haddam 54
- East Hampton 54
- East Hartford 54
- Farmington 54
- Gales Ferry 54
- Hebron 54
- Higganum 54
- Jewett City 54
- Lake Pocotopaug 54
- Lisbon 54
- Long Hill 54
- Moodus 54
- Moosup 54
- Mystic 54
- New Canaan 54
- Noank 54
- North Branford 54
- Old Mystic 54
- Oxoboxo River 54
- Pawcatuck 54
- Plainfield 54
- Plainfield Village 54
- Poquonock Bridge 54
- Preston City 54
- Salem 54
- South Windham 54
- Storrs 54
- Stratford 54
- Terramuggus 54
- Uncasville 54
- West Haven 54
- Willimantic 54
- Wilton 54
- Woodmont 54
- Ansonia 53
- Coventry Lake 53
- Cromwell 53
- Danbury 53
- Derby 53
- Easton 53
- Georgetown 53
- Glastonbury Center 53
- Hamden 53
- Killingly Center 53
- Manchester 53
- Meriden 53
- New London 53
- North Grosvenor Dale 53
- North Haven 53
- Orange 53
- Portland 53
- Putnam 53
- Quinebaug 53
- Shelton 53
- South Coventry 53
- South Woodstock 53
- Thompson 53
- Wallingford 53
- Wallingford Center 53
- Woodbridge 53
- Cheshire 52
- Cheshire Village 52
- Crystal Lake 52
- Ellington 52
- Kensington 52
- Milford 52
- New Britain 52
- Newington 52
- Prospect 52
- Rockville 52
- Seymour 52
- Stafford 52
- Stafford Springs 52
- Wethersfield 52
- Bethel 51
- Naugatuck 51
- New Haven 51
- South Windsor 51
- East Windsor 50
- Newtown 50
- Old Greenwich 50
- Plainville 50
- Blue Hills 49
- Southbury 49
- Windsor 49
- Wolcott 49
- Bristol 48
- Groton 48
- Hazardville 48
- Heritage Village 48
- Norwich 48
- Southwood Acres 48
- Trumbull 48
- Windsor Locks 48
- Branford 47
- Bridgeport 47
- Hartford 47
- Mansfield City 47
- Montville Center 47
- Oxford 47
- Sherwood Manor 47
- Middletown 46
- New Fairfield 46
- Oakville 46
- Suffield Depot 46
- Thompsonville 46
- Watertown 46
- Windham 46
- Woodbury 46
- Woodbury Center 46
- Tariffville 45
- Terryville 45
- Weatogue 45
- Ledyard 44
- Plymouth 44
- Thomaston 44
- Bethlehem Village 43
- Canton Valley 43
- Clinton 43
- Collinsville 43
- Simsbury Center 43
- New Milford 42
- Stamford 42
- West Simsbury 42
- Northwest Harwinton 40
- Salmon Brook 40
- Washington 40
- Litchfield 39
- Glastonbury 38
- New Hartford Center 38
- North Granby 38
- Torrington 38
- West Hartford 38
- New Preston 37
- Pomfret Center 37
- Fairfield 35
- Kent 35
- Waterford 35
- Wauregan 35
- Westport 35
- Winchester Center 35
- Redding 34
- Canaan 33
- Greenwich 33
- North Stamford 33
- Ridgefield 33
- Somers 33
- West Torrington 32
- West Cornwall 31
- Sherman 30
- Middlebury 29
- Winsted 29
- Guilford 20
AQI US, Metric