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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 | 60 |
| 2 | Tolland | 60 |
| 3 | Enfield | 59 |
| 4 | Waterbury | 59 |
| 5 | Danbury | 55 |
| 6 | Wauregan | 55 |
| 7 | Shelton | 54 |
| 8 | Trumbull | 54 |
| 9 | Farmington | 53 |
| 10 | Groton | 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 | Southington | 25 |
| 3 | Middlebury | 27 |
| 4 | Ridgefield | 27 |
| 5 | Sherman | 28 |
| 6 | Greenwich | 31 |
| 7 | West Cornwall | 32 |
| 8 | West Torrington | 32 |
| 9 | Somers | 34 |
| 10 | Waterford | 34 |
(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 60
- Tolland 60
- Enfield 59
- Waterbury 59
- Byram 55
- Cos Cob 55
- Danbury 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
- Wauregan 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
- 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
- Shelton 54
- South Windham 54
- Stratford 54
- Terramuggus 54
- Trumbull 54
- Uncasville 54
- West Haven 54
- Willimantic 54
- Wilton 54
- Woodmont 54
- Ansonia 53
- Coventry Lake 53
- Cromwell 53
- Derby 53
- Easton 53
- Farmington 53
- Georgetown 53
- Glastonbury Center 53
- Groton 53
- Killingly Center 53
- Manchester 53
- Meriden 53
- Milford 53
- New Haven 53
- New London 53
- North Grosvenor Dale 53
- North Haven 53
- Orange 53
- Portland 53
- Putnam 53
- Quinebaug 53
- South Coventry 53
- South Woodstock 53
- Thompson 53
- Wallingford 53
- Wallingford Center 53
- Woodbridge 53
- Bridgeport 52
- Cheshire 52
- Cheshire Village 52
- Crystal Lake 52
- Ellington 52
- Kensington 52
- New Britain 52
- Newington 52
- Prospect 52
- Rockville 52
- Seymour 52
- Stafford Springs 52
- Stamford 52
- Wethersfield 52
- Bethel 51
- East Hartford 51
- Naugatuck 51
- South Windsor 51
- Stafford 51
- Storrs 51
- East Windsor 50
- Newtown 50
- Old Greenwich 50
- Plainville 50
- West Hartford 50
- Blue Hills 49
- Oxford 49
- Southbury 49
- Windsor 49
- Wolcott 49
- Bristol 48
- Hamden 48
- Hazardville 48
- Heritage Village 48
- Southwood Acres 48
- Windsor Locks 48
- Sherwood Manor 47
- Hartford 46
- New Fairfield 46
- Oakville 46
- Redding 46
- Suffield Depot 46
- Thompsonville 46
- Watertown 46
- Windham 46
- Woodbury 46
- Woodbury Center 46
- Mansfield City 45
- Middletown 45
- Tariffville 45
- Terryville 45
- Weatogue 45
- Fairfield 44
- Plymouth 44
- Thomaston 44
- Bethlehem Village 43
- Canton Valley 43
- Clinton 43
- Collinsville 43
- Simsbury Center 43
- Ledyard 42
- New Milford 42
- West Simsbury 42
- Montville Center 40
- Northwest Harwinton 40
- Norwich 40
- Pomfret Center 40
- Salmon Brook 40
- Washington 40
- Litchfield 39
- Westport 39
- New Hartford Center 38
- North Granby 38
- North Stamford 38
- Torrington 38
- Branford 37
- New Preston 37
- Glastonbury 36
- Winsted 36
- Kent 35
- Winchester Center 35
- Somers 34
- Waterford 34
- Canaan 33
- West Cornwall 32
- West Torrington 32
- Greenwich 31
- Sherman 28
- Middlebury 27
- Ridgefield 27
- Southington 25
- Guilford 20
AQI US, Metric