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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 |  Greenwich | 50 |
| 2 | Danbury | 49 |
| 3 | West Cornwall | 48 |
| 4 | West Torrington | 48 |
| 5 | North Stamford | 47 |
| 6 | Ridgefield | 47 |
| 7 | Woodbury | 46 |
| 8 | Hamden | 41 |
| 9 | Hartford | 41 |
| 10 | Stamford | 40 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
71 Contributors
See all
LIVE AQI CITY RANKING
Real-time Connecticut
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Milford | 6 |
| 2 | New London | 12 |
| 3 | Guilford | 13 |
| 4 | Wauregan | 14 |
| 5 | Groton | 16 |
| 6 | Somers | 16 |
| 7 | Winsted | 16 |
| 8 | Branford | 17 |
| 9 | Montville Center | 17 |
| 10 | Shelton | 17 |
(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
71Contributors
Government Contributor
- Clancy Nolan
1 station
- Peter
1 station
- Nibbles
1 station
- The Zs
1 station
- D&S
1 station
5 Individual Contributors
65 Anonymous contributors65 stations
65 Anonymous Contributors
Which is the most polluted city in Connecticut?
- Canaan 57
- Kent 54
- Winchester Center 54
- New Hartford Center 53
- New Preston 53
- North Granby 53
- Salmon Brook 53
- Litchfield 52
- New Milford 52
- Northwest Harwinton 52
- Sherwood Manor 52
- Suffield Depot 52
- Thompsonville 52
- Torrington 52
- Washington 52
- West Simsbury 52
- Canton Valley 51
- Collinsville 51
- Hazardville 51
- New Fairfield 51
- Simsbury Center 51
- Southwood Acres 51
- Tariffville 51
- Greenwich 50
- Weatogue 50
- Bethlehem Village 49
- Danbury 49
- Windsor Locks 49
- East Windsor 48
- Thomaston 48
- West Cornwall 48
- West Torrington 48
- North Stamford 47
- Plymouth 47
- Ridgefield 47
- Stafford Springs 47
- Windsor 47
- Bethel 46
- Blue Hills 46
- Crystal Lake 46
- Terryville 46
- Woodbury 46
- Ellington 45
- Watertown 45
- Woodbury Center 45
- Heritage Village 44
- Oakville 44
- South Windsor 44
- Bristol 43
- Farmington 43
- Rockville 43
- Southbury 43
- Quinebaug 42
- Hamden 41
- Hartford 41
- Plainville 41
- Georgetown 40
- Manchester 40
- Newington 40
- Stamford 40
- Wolcott 40
- East Haven 39
- North Grosvenor Dale 39
- Waterbury 39
- New Britain 38
- Newtown 38
- South Woodstock 38
- Wethersfield 38
- Thompson 37
- Glastonbury Center 36
- Glenville 36
- Kensington 36
- Naugatuck 36
- Redding 36
- Wilton 36
- Coventry Lake 35
- New Canaan 35
- Pemberwick 35
- Prospect 35
- Putnam 35
- Byram 34
- Cos Cob 34
- Easton 34
- Fairfield 34
- South Coventry 34
- Cheshire 33
- Cheshire Village 33
- New Haven 33
- Riverside 33
- Seymour 33
- Storrs 33
- Cromwell 32
- East Hartford 32
- Meriden 32
- Sherman 32
- Clinton 31
- Darien 31
- Killingly Center 31
- Norwalk 31
- Portland 31
- Terramuggus 31
- Waterford 31
- Ansonia 30
- Danielson 30
- Derby 30
- East Brooklyn 30
- East Norwalk 30
- Lake Pocotopaug 30
- Willimantic 30
- Southport 29
- Tolland 29
- East Hampton 28
- South Windham 28
- Stafford 28
- Wallingford 28
- Windham 28
- North Haven 27
- Wallingford Center 27
- Colchester 26
- Durham 26
- Glastonbury 26
- Moosup 26
- Orange 26
- City of Milford (balance) 25
- Higganum 25
- Plainfield 25
- Plainfield Village 25
- Stratford 25
- Trumbull 25
- West Haven 25
- Baltic 24
- Enfield 24
- Middlebury 24
- Middletown 24
- Pomfret Center 24
- West Hartford 24
- Woodmont 24
- Moodus 23
- Woodbridge 23
- Branford Center 22
- Jewett City 22
- Lisbon 22
- North Branford 22
- Westport 22
- Bridgeport 21
- East Haddam 21
- Mansfield City 21
- Salem 21
- Chester Center 20
- Oxford 20
- Deep River Center 19
- Essex Village 19
- Guilford Center 19
- Ledyard 19
- Old Greenwich 19
- Madison Center 18
- Norwich 18
- Oxoboxo River 18
- Preston City 18
- Branford 17
- Gales Ferry 17
- Madison 17
- Montville Center 17
- Old Lyme 17
- Old Saybrook 17
- Old Saybrook Center 17
- Saybrook Manor 17
- Shelton 17
- Southington 17
- Uncasville 17
- Westbrook Center 17
- Conning Towers-Nautilus Park 16
- Groton 16
- Niantic 16
- Somers 16
- Winsted 16
- Central Waterford 15
- Long Hill 15
- Old Mystic 15
- Poquonock Bridge 15
- Mystic 14
- Noank 14
- Pawcatuck 14
- Wauregan 14
- Guilford 13
- New London 12
- Milford 6
- Hebron 5
AQI US, Metric