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 New Hampshire
Air quality index (AQI) and PM2.5 air pollution in New Hampshire
LIVE AQI CITY RANKING
Real-time New Hampshire
Most polluted city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Portsmouth | 33 |
| 2 | Suncook | 30 |
| 3 | Peterborough | 29 |
| 4 | Keene | 26 |
| 5 | Dover | 25 |
| 6 | Gilford | 25 |
| 7 | Londonderry | 23 |
| 8 | Concord | 22 |
| 9 | Sutton | 21 |
| 10 | West Lebanon | 21 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
33 Contributors
See all
LIVE AQI CITY RANKING
Real-time New Hampshire
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Wilton | 2 |
| 2 | Conway | 10 |
| 3 | Chesterfield | 11 |
| 4 | Effingham | 11 |
| 5 | Barrington | 12 |
| 6 | Sandwich | 12 |
| 7 | Hanover | 14 |
| 8 | Deerfield | 15 |
| 9 | Troy | 15 |
| 10 | Littleton | 16 |
(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.
New Hampshire air quality data attribution
33Contributors
Government Contributor
- water1998
1 station
Non-profit organization Contributor
- 29 Anonymous contributors
29 stations
29 Anonymous Contributors
Which is the most polluted city in New Hampshire?
- Portsmouth 33
- Suncook 30
- Peterborough 29
- Colebrook 26
- Keene 26
- Dover 25
- Gilford 25
- Groveton 25
- Stratford 25
- Lancaster 24
- Northumberland 24
- Berlin 23
- Gorham 23
- Haverhill 23
- Jackson 23
- Jefferson 23
- Milan 23
- North Haverhill 23
- North Woodstock 23
- Randolph 23
- Whitefield 23
- Woodsville 23
- Concord 22
- Lyme 22
- North Conway 22
- Orford 22
- Pelham 22
- Claremont 21
- Enfield 21
- Freedom 21
- Grantham 21
- Lebanon 21
- Londonderry 21
- Madison 21
- Nashua 21
- Salem 21
- Springfield 21
- Sutton 21
- West Lebanon 21
- Windham 21
- Woodstock 21
- Alexandria 20
- Alstead 20
- Andover 20
- Ashland 20
- Atkinson 20
- Bridgewater 20
- Bristol 20
- Candia 20
- Center Harbor 20
- Charlestown 20
- Chester 20
- Danbury 20
- Danville 20
- Derry 20
- Derry Village 20
- Grafton 20
- Hampstead 20
- Hill 20
- Holderness 20
- Hollis 20
- Hudson 20
- Lempster 20
- Litchfield 20
- Moultonborough 20
- New Durham 20
- New London 20
- Newbury 20
- Newport 20
- Newton 20
- Ossipee 20
- Plaistow 20
- Plymouth 20
- Rumney 20
- Sanbornville 20
- Sandown 20
- Sunapee 20
- Tamworth 20
- Thornton 20
- Tuftonboro 20
- Unity 20
- Wakefield 20
- Wilmot 20
- Wolfeboro 20
- Allenstown 19
- Antrim 19
- Auburn 19
- Bedford 19
- Belmont 19
- Boscawen 19
- Bow Bog 19
- Canterbury 19
- Chichester 19
- Contoocook 19
- Deering 19
- East Concord 19
- East Kingston 19
- East Merrimack 19
- Epping 19
- Epsom 19
- Farmington 19
- Fitzwilliam 19
- Franklin 19
- Fremont 19
- Gilmanton 19
- Goffstown 19
- Greenville 19
- Hampton 19
- Hampton Beach 19
- Hampton Falls 19
- Henniker 19
- Hillsborough 19
- Hinsdale 19
- Hopkinton 19
- Kensington 19
- Kingston 19
- Lee 19
- Manchester 19
- Marlborough 19
- Mason 19
- Merrimack 19
- Milford 19
- Mont Vernon 19
- New Boston 19
- New Castle 19
- New Ipswich 19
- Northfield 19
- Northwood 19
- Nottingham 19
- Pembroke 19
- Pinardville 19
- Pittsfield 19
- Raymond 19
- Richmond 19
- Rochester 19
- Rollinsford 19
- Rye 19
- Salisbury 19
- Sanbornton 19
- Seabrook 19
- Somersworth 19
- South Hooksett 19
- Strafford 19
- Swanzey 19
- Tilton 19
- Tilton-Northfield 19
- Weare 19
- Webster 19
- West Swanzey 19
- Westmoreland 19
- Winchester 19
- Dublin 18
- Durham 18
- Exeter 18
- Francestown 18
- Greenfield 18
- Greenland 18
- Harrisville 18
- Jaffrey 18
- Laconia 18
- Lyndeborough 18
- Madbury 18
- Newmarket 18
- North Hampton 18
- Rindge 18
- Stratham Station 18
- Temple 18
- Barnstead 17
- Brentwood 17
- Brookline 17
- Hooksett 17
- Meredith 17
- Littleton 16
- Deerfield 15
- Troy 15
- Hanover 14
- Barrington 12
- Sandwich 12
- Chesterfield 11
- Effingham 11
- Conway 10
- Wilton 2
AQI US, Metric