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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 | 46 |
| 2 | Danbury | 31 |
| 3 | New Haven | 30 |
| 4 | East Hartford | 27 |
| 5 | Old Greenwich | 25 |
| 6 | Groton | 24 |
| 7 | East Haven | 22 |
| 8 | New London | 22 |
| 9 | Wauregan | 22 |
| 10 | Redding | 21 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
68 Contributors
See all
LIVE AQI CITY RANKING
Real-time Connecticut
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Pomfret Center | 1 |
| 2 | Guilford | 4 |
| 3 | Mansfield City | 4 |
| 4 | North Stamford | 5 |
| 5 | Waterford | 5 |
| 6 | Clinton | 6 |
| 7 | Milford | 6 |
| 8 | Somers | 6 |
| 9 | Windham | 6 |
| 10 | Montville Center | 7 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
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Moderate
Unhealthy for sensitive groups
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News
The latest air quality news and resources.
Connecticut air quality data attribution
68Contributors
Government Contributor
- Clancy Nolan
1 station
- Peter
1 station
- Nibbles
1 station
- The Zs
1 station
- D&S
1 station
5 Individual Contributors
62 Anonymous contributors62 stations
62 Anonymous Contributors
Which is the most polluted city in Connecticut?
- Waterbury 46
- Byram 38
- Glenville 38
- Pemberwick 38
- Cos Cob 37
- Riverside 37
- Darien 35
- New Canaan 35
- Bethel 34
- East Norwalk 34
- Georgetown 34
- Kent 34
- New Fairfield 34
- New Milford 34
- Norwalk 34
- Wilton 34
- Bethlehem Village 33
- Canaan 33
- City of Milford (balance) 33
- Derby 33
- Easton 33
- Heritage Village 33
- Litchfield 33
- New Preston 33
- Southbury 33
- Southport 33
- Stratford 33
- Washington 33
- Watertown 33
- Woodbury Center 33
- Ansonia 32
- Branford Center 32
- Cheshire 32
- Cheshire Village 32
- Naugatuck 32
- North Haven 32
- Northwest Harwinton 32
- Oakville 32
- Orange 32
- Plymouth 32
- Prospect 32
- Seymour 32
- Terryville 32
- Thomaston 32
- Torrington 32
- Wallingford 32
- Wallingford Center 32
- West Haven 32
- Winchester Center 32
- Wolcott 32
- Woodmont 32
- Bristol 31
- Canton Valley 31
- Collinsville 31
- Danbury 31
- Durham 31
- Farmington 31
- Guilford Center 31
- Kensington 31
- Madison 31
- Madison Center 31
- Meriden 31
- New Britain 31
- New Hartford Center 31
- North Branford 31
- Plainville 31
- Cromwell 30
- Higganum 30
- New Haven 30
- Newington 30
- Portland 30
- Simsbury Center 30
- Weatogue 30
- West Simsbury 30
- Westbrook Center 30
- Blue Hills 29
- Chester Center 29
- Deep River Center 29
- East Haddam 29
- East Hampton 29
- Essex Village 29
- Glastonbury Center 29
- Lake Pocotopaug 29
- Moodus 29
- North Granby 29
- Old Saybrook 29
- Old Saybrook Center 29
- Salmon Brook 29
- Saybrook Manor 29
- South Windsor 29
- Tariffville 29
- Terramuggus 29
- Wethersfield 29
- Windsor 29
- East Windsor 28
- Ellington 28
- Hazardville 28
- Manchester 28
- Rockville 28
- Sherwood Manor 28
- Southwood Acres 28
- Suffield Depot 28
- Thompsonville 28
- Windsor Locks 28
- Colchester 27
- Coventry Lake 27
- East Hartford 27
- Niantic 27
- Salem 27
- Crystal Lake 26
- South Coventry 26
- Stafford Springs 26
- Baltic 25
- Central Waterford 25
- Gales Ferry 25
- Old Greenwich 25
- Oxoboxo River 25
- South Windham 25
- Uncasville 25
- Willimantic 25
- Conning Towers-Nautilus Park 24
- Groton 24
- Lisbon 24
- Long Hill 24
- Poquonock Bridge 24
- Jewett City 23
- Mystic 23
- Noank 23
- Old Mystic 23
- Preston City 23
- Putnam 23
- Quinebaug 23
- South Woodstock 23
- Danielson 22
- East Brooklyn 22
- East Haven 22
- Moosup 22
- New London 22
- North Grosvenor Dale 22
- Plainfield 22
- Plainfield Village 22
- Thompson 22
- Wauregan 22
- Killingly Center 21
- Pawcatuck 21
- Redding 21
- Woodbury 20
- Hartford 19
- Stamford 19
- Woodbridge 19
- Trumbull 18
- West Cornwall 18
- West Torrington 18
- Bridgeport 17
- Fairfield 17
- Greenwich 17
- Glastonbury 16
- Ledyard 16
- Newtown 16
- Shelton 16
- Sherman 16
- Stafford 16
- Southington 15
- Middlebury 14
- Old Lyme 14
- Westport 14
- Winsted 14
- Hamden 13
- Middletown 13
- Storrs 13
- Enfield 12
- Oxford 12
- Ridgefield 11
- Norwich 10
- Branford 9
- West Hartford 9
- Tolland 8
- Hebron 7
- Montville Center 7
- Clinton 6
- Milford 6
- Somers 6
- Windham 6
- North Stamford 5
- Waterford 5
- Guilford 4
- Mansfield City 4
- Pomfret Center 1
AQI US, Metric