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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 |  Pomfret Center | 38 |
| 2 | Groton | 36 |
| 3 | Norwich | 36 |
| 4 | Wauregan | 36 |
| 5 | Ledyard | 35 |
| 6 | Mansfield City | 35 |
| 7 | Clinton | 34 |
| 8 | Glastonbury | 34 |
| 9 | Stafford | 34 |
| 10 | New London | 33 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
72 Contributors
See all
LIVE AQI CITY RANKING
Real-time Connecticut
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Milford | 9 |
| 2 | North Stamford | 11 |
| 3 | Guilford | 13 |
| 4 | Branford | 16 |
| 5 | Ridgefield | 16 |
| 6 | Hebron | 17 |
| 7 | West Hartford | 20 |
| 8 | Westport | 20 |
| 9 | Enfield | 22 |
| 10 | Fairfield | 22 |
(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
72Contributors
Government Contributor
- Clancy Nolan
1 station
- Peter
1 station
- Nibbles
1 station
- The Zs
1 station
- D&S
1 station
5 Individual Contributors
66 Anonymous contributors66 stations
66 Anonymous Contributors
Which is the most polluted city in Connecticut?
- Bethel 58
- Byram 58
- Canaan 58
- Cos Cob 58
- Glenville 58
- Kent 58
- Litchfield 58
- New Canaan 58
- New Fairfield 58
- New Milford 58
- New Preston 58
- Pemberwick 58
- Riverside 58
- Washington 58
- Ansonia 57
- Bethlehem Village 57
- Blue Hills 57
- Bristol 57
- Canton Valley 57
- Cheshire 57
- Cheshire Village 57
- Collinsville 57
- Crystal Lake 57
- Darien 57
- Derby 57
- East Norwalk 57
- East Windsor 57
- Easton 57
- Ellington 57
- Farmington 57
- Georgetown 57
- Glastonbury Center 57
- Hazardville 57
- Heritage Village 57
- Kensington 57
- Manchester 57
- Meriden 57
- Naugatuck 57
- New Britain 57
- New Hartford Center 57
- Newington 57
- North Granby 57
- Northwest Harwinton 57
- Norwalk 57
- Oakville 57
- Plainville 57
- Plymouth 57
- Prospect 57
- Rockville 57
- Salmon Brook 57
- Seymour 57
- Sherwood Manor 57
- Simsbury Center 57
- South Windsor 57
- Southbury 57
- Southport 57
- Southwood Acres 57
- Stafford Springs 57
- Suffield Depot 57
- Tariffville 57
- Terryville 57
- Thomaston 57
- Thompsonville 57
- Torrington 57
- Watertown 57
- Weatogue 57
- West Simsbury 57
- Wethersfield 57
- Wilton 57
- Winchester Center 57
- Windsor 57
- Windsor Locks 57
- Wolcott 57
- Woodbury Center 57
- Branford Center 56
- City of Milford (balance) 56
- Colchester 56
- Coventry Lake 56
- Cromwell 56
- Durham 56
- East Hampton 56
- Guilford Center 56
- Higganum 56
- Lake Pocotopaug 56
- Moodus 56
- North Branford 56
- North Haven 56
- Orange 56
- Portland 56
- Quinebaug 56
- South Coventry 56
- South Woodstock 56
- Stratford 56
- Terramuggus 56
- Wallingford 56
- Wallingford Center 56
- West Haven 56
- Willimantic 56
- Woodmont 56
- Baltic 55
- Chester Center 55
- Danielson 55
- Deep River Center 55
- East Brooklyn 55
- East Haddam 55
- Essex Village 55
- Killingly Center 55
- Lisbon 55
- Madison 55
- Madison Center 55
- Niantic 55
- North Grosvenor Dale 55
- Old Saybrook 55
- Old Saybrook Center 55
- Putnam 55
- Salem 55
- Saybrook Manor 55
- South Windham 55
- Thompson 55
- Westbrook Center 55
- Central Waterford 54
- Conning Towers-Nautilus Park 54
- Gales Ferry 54
- Jewett City 54
- Long Hill 54
- Moosup 54
- Mystic 54
- Noank 54
- Old Mystic 54
- Oxoboxo River 54
- Plainfield 54
- Plainfield Village 54
- Poquonock Bridge 54
- Preston City 54
- Uncasville 54
- Pawcatuck 53
- Pomfret Center 38
- Groton 36
- Norwich 36
- Wauregan 36
- Ledyard 35
- Mansfield City 35
- Clinton 34
- Glastonbury 34
- Stafford 34
- New London 33
- Waterford 33
- Montville Center 32
- Hartford 31
- Middletown 31
- Windham 31
- Storrs 30
- Woodbury 30
- Redding 29
- Waterbury 29
- Bridgeport 28
- East Hartford 28
- Hamden 28
- Tolland 28
- Danbury 27
- East Haven 27
- Newtown 27
- New Haven 26
- Oxford 26
- Shelton 26
- Trumbull 26
- West Cornwall 26
- West Torrington 26
- Middlebury 25
- Old Greenwich 25
- Stamford 25
- Somers 24
- Winsted 24
- Sherman 23
- Southington 23
- Enfield 22
- Fairfield 22
- Greenwich 22
- Woodbridge 22
- West Hartford 20
- Westport 20
- Hebron 17
- Branford 16
- Ridgefield 16
- Old Lyme 14
- Guilford 13
- North Stamford 11
- Milford 9
AQI US, Metric