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 |  Waterbury | 46 |
| 2 | Wauregan | 40 |
| 3 | Old Greenwich | 29 |
| 4 | Pomfret Center | 26 |
| 5 | Trumbull | 23 |
| 6 | Woodbury | 22 |
| 7 | Stamford | 19 |
| 8 | East Haven | 18 |
| 9 | Greenwich | 18 |
| 10 | Redding | 18 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
67 Contributors
See all
LIVE AQI CITY RANKING
Real-time Connecticut
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Tolland | 1 |
| 2 | Clinton | 4 |
| 3 | Glastonbury | 4 |
| 4 | Guilford | 4 |
| 5 | Somers | 4 |
| 6 | Mansfield City | 5 |
| 7 | Norwich | 5 |
| 8 | Ridgefield | 5 |
| 9 | Waterford | 5 |
| 10 | Milford | 6 |
(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
67Contributors
Government Contributor
- Clancy Nolan
1 station
- Peter
1 station
- Nibbles
1 station
- The Zs
1 station
- D&S
1 station
5 Individual Contributors
61 Anonymous contributors61 stations
61 Anonymous Contributors
Which is the most polluted city in Connecticut?
- Waterbury 46
- Wauregan 40
- Byram 34
- Glenville 33
- Pemberwick 33
- Cos Cob 32
- Riverside 32
- Old Greenwich 29
- Darien 28
- New Canaan 28
- East Norwalk 27
- Norwalk 27
- Bethel 26
- Bristol 26
- Canaan 26
- Canton Valley 26
- City of Milford (balance) 26
- Collinsville 26
- Easton 26
- Farmington 26
- Georgetown 26
- Kent 26
- New Fairfield 26
- New Hartford Center 26
- New Milford 26
- North Granby 26
- Northwest Harwinton 26
- Oakville 26
- Orange 26
- Plainville 26
- Plymouth 26
- Pomfret Center 26
- Prospect 26
- Salmon Brook 26
- Simsbury Center 26
- Southport 26
- Stratford 26
- Suffield Depot 26
- Tariffville 26
- Terryville 26
- Thomaston 26
- Thompsonville 26
- Weatogue 26
- West Simsbury 26
- Wilton 26
- Winchester Center 26
- Wolcott 26
- Woodmont 26
- Ansonia 25
- Bethlehem Village 25
- Blue Hills 25
- Branford Center 25
- Cheshire 25
- Cheshire Village 25
- Cromwell 25
- Crystal Lake 25
- Derby 25
- Durham 25
- East Hampton 25
- East Windsor 25
- Ellington 25
- Glastonbury Center 25
- Guilford Center 25
- Hazardville 25
- Heritage Village 25
- Higganum 25
- Kensington 25
- Lake Pocotopaug 25
- Litchfield 25
- Manchester 25
- Meriden 25
- Naugatuck 25
- New Britain 25
- New Preston 25
- Newington 25
- North Branford 25
- North Haven 25
- Portland 25
- Rockville 25
- Seymour 25
- Sherwood Manor 25
- South Windsor 25
- Southbury 25
- Southwood Acres 25
- Stafford Springs 25
- Terramuggus 25
- Torrington 25
- Wallingford 25
- Wallingford Center 25
- Washington 25
- Watertown 25
- West Haven 25
- Wethersfield 25
- Windsor 25
- Windsor Locks 25
- Woodbury Center 25
- Chester Center 24
- Colchester 24
- Coventry Lake 24
- Deep River Center 24
- East Haddam 24
- Madison 24
- Madison Center 24
- Moodus 24
- South Coventry 24
- Essex Village 23
- Old Saybrook 23
- Old Saybrook Center 23
- Saybrook Manor 23
- Trumbull 23
- Westbrook Center 23
- Salem 22
- Willimantic 22
- Woodbury 22
- Niantic 21
- South Windham 21
- Baltic 19
- Central Waterford 19
- Oxoboxo River 19
- Putnam 19
- Quinebaug 19
- South Woodstock 19
- Stamford 19
- Uncasville 19
- Conning Towers-Nautilus Park 18
- East Haven 18
- Gales Ferry 18
- Greenwich 18
- Lisbon 18
- Long Hill 18
- North Grosvenor Dale 18
- Redding 18
- West Cornwall 18
- Danielson 17
- East Brooklyn 17
- Jewett City 17
- Killingly Center 17
- Moosup 17
- Noank 17
- Plainfield 17
- Plainfield Village 17
- Poquonock Bridge 17
- Preston City 17
- Thompson 17
- West Torrington 17
- Woodbridge 17
- Mystic 16
- Old Mystic 16
- Sherman 16
- Southington 16
- Fairfield 15
- Hamden 15
- Hartford 15
- Shelton 15
- Bridgeport 14
- Middlebury 14
- New Haven 14
- New London 14
- Old Lyme 14
- Pawcatuck 14
- Westport 14
- Danbury 13
- Middletown 13
- Newtown 13
- Enfield 12
- Winsted 12
- North Stamford 11
- Oxford 11
- Stafford 11
- Groton 10
- Ledyard 9
- Storrs 9
- Branford 8
- Windham 8
- East Hartford 7
- Hebron 7
- Montville Center 7
- West Hartford 7
- Milford 6
- Mansfield City 5
- Norwich 5
- Ridgefield 5
- Waterford 5
- Clinton 4
- Glastonbury 4
- Guilford 4
- Somers 4
- Tolland 1
AQI US, Metric