Get a monitor and contributor to air quality data in your city.
Air Quality 
Air Monitors
Air Purifiers
For Business
News
Support
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 | Wauregan | 40 |
| 2 | West Cornwall | 31 |
| 3 | West Torrington | 31 |
| 4 | Pomfret Center | 28 |
| 5 | Stafford | 28 |
| 6 | Stamford | 26 |
| 7 | Fairfield | 25 |
| 8 | North Stamford | 25 |
| 9 | Ridgefield | 25 |
| 10 | Waterford | 25 |
(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 | 4 |
| 2 | Middlebury | 7 |
| 3 | Milford | 7 |
| 4 | Westport | 9 |
| 5 | Branford | 10 |
| 6 | Clinton | 12 |
| 7 | Ledyard | 12 |
| 8 | West Hartford | 12 |
| 9 | Enfield | 13 |
| 10 | Groton | 13 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
Good
Moderate
Unhealthy for sensitive groups
Unhealthy
Very unhealthy
Hazardous
News
The latest air quality news and resources.
Connecticut air quality data attribution
70Contributors
Government Contributor
- Clancy Nolan
1 station
- Peter
1 station
- Nibbles
1 station
- The Zs
1 station
- D&S
1 station
5 Individual Contributors
64 Anonymous contributors64 stations
64 Anonymous Contributors
Which is the most polluted city in Connecticut?
- Wauregan 40
- Canaan 33
- Kent 31
- West Cornwall 31
- West Torrington 31
- Winchester Center 31
- New Preston 30
- Stratford 30
- New Milford 29
- Torrington 29
- Litchfield 28
- New Hartford Center 28
- North Granby 28
- Pomfret Center 28
- Stafford 28
- Washington 28
- New Fairfield 27
- Salmon Brook 27
- Bethel 26
- Bethlehem Village 26
- Northwest Harwinton 26
- Stamford 26
- West Simsbury 26
- Canton Valley 25
- Collinsville 25
- Fairfield 25
- Heritage Village 25
- North Stamford 25
- Plymouth 25
- Ridgefield 25
- Sherwood Manor 25
- Simsbury Center 25
- Thomaston 25
- Waterford 25
- Woodbury 25
- Woodbury Center 25
- Georgetown 24
- Newtown 24
- Oakville 24
- Southbury 24
- Suffield Depot 24
- Tariffville 24
- Terryville 24
- Thompsonville 24
- Watertown 24
- Weatogue 24
- Hartford 23
- Waterbury 23
- Bristol 22
- Easton 22
- Hazardville 22
- Southwood Acres 22
- Wilton 22
- Windsor Locks 22
- Danbury 21
- East Windsor 21
- New Canaan 21
- Stafford Springs 21
- Wolcott 21
- Woodbridge 21
- Blue Hills 20
- Cos Cob 20
- Crystal Lake 20
- Farmington 20
- Glenville 20
- Naugatuck 20
- New London 20
- Pemberwick 20
- Plainville 20
- Seymour 20
- Trumbull 20
- Windham 20
- Windsor 20
- Ansonia 19
- Byram 19
- Darien 19
- Derby 19
- East Hartford 19
- Ellington 19
- Greenwich 19
- New Britain 19
- New Haven 19
- Newington 19
- Norwalk 19
- Prospect 19
- Quinebaug 19
- Riverside 19
- Rockville 19
- South Windsor 19
- Cheshire 18
- Cheshire Village 18
- East Norwalk 18
- Hamden 18
- Kensington 18
- Manchester 18
- Meriden 18
- Old Greenwich 18
- Orange 18
- Redding 18
- Southport 18
- Storrs 18
- Tolland 18
- Wethersfield 18
- City of Milford (balance) 17
- East Haven 17
- Glastonbury 17
- Glastonbury Center 17
- North Grosvenor Dale 17
- South Woodstock 17
- Thompson 17
- Wallingford 17
- Winsted 17
- Cromwell 16
- Madison 16
- Mansfield City 16
- Montville Center 16
- North Haven 16
- Oxford 16
- Portland 16
- Putnam 16
- Wallingford Center 16
- West Haven 16
- Woodmont 16
- Bridgeport 15
- Central Waterford 15
- Colchester 15
- Coventry Lake 15
- Danielson 15
- Durham 15
- East Brooklyn 15
- East Haddam 15
- East Hampton 15
- Higganum 15
- Killingly Center 15
- Lake Pocotopaug 15
- Middletown 15
- Moodus 15
- Moosup 15
- Mystic 15
- Niantic 15
- Noank 15
- Norwich 15
- Old Mystic 15
- Pawcatuck 15
- Plainfield 15
- Plainfield Village 15
- Poquonock Bridge 15
- Salem 15
- Shelton 15
- Somers 15
- South Coventry 15
- South Windham 15
- Terramuggus 15
- Willimantic 15
- Baltic 14
- Branford Center 14
- Chester Center 14
- Conning Towers-Nautilus Park 14
- Deep River Center 14
- Essex Village 14
- Gales Ferry 14
- Guilford Center 14
- Jewett City 14
- Lisbon 14
- Long Hill 14
- Madison Center 14
- North Branford 14
- Old Lyme 14
- Old Saybrook 14
- Old Saybrook Center 14
- Oxoboxo River 14
- Preston City 14
- Saybrook Manor 14
- Sherman 14
- Uncasville 14
- Westbrook Center 14
- Enfield 13
- Groton 13
- Southington 13
- Clinton 12
- Ledyard 12
- West Hartford 12
- Branford 10
- Westport 9
- Middlebury 7
- Milford 7
- Guilford 4
- Hebron 3
AQI US, Metric