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
AIR QUALITY DATA CONTRIBUTORS
32 Contributors
See all
LIVE AQI CITY RANKING
Real-time New Hampshire
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 |  Effingham | 33 |
| 2 | Troy | 33 |
| 3 | Conway | 35 |
| 4 | Peterborough | 35 |
| 5 | Gilford | 37 |
| 6 | Barrington | 40 |
| 7 | Laconia | 41 |
| 8 | Littleton | 42 |
| 9 | Sandwich | 42 |
| 10 | Chesterfield | 43 |
(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
32Contributors
Government Contributor
- water1998
1 station
Non-profit organization Contributor
- 28 Anonymous contributors
28 stations
28 Anonymous Contributors
Which is the most polluted city in New Hampshire?
- Freedom 58
- New Castle 58
- Ossipee 58
- Rollinsford 58
- Sanbornville 58
- Somersworth 58
- Wakefield 58
- Allenstown 57
- Atkinson 57
- Auburn 57
- Bedford 57
- Bow Bog 57
- Candia 57
- Chester 57
- Chichester 57
- Danville 57
- Derry 57
- Derry Village 57
- Durham 57
- East Concord 57
- East Kingston 57
- East Merrimack 57
- Epping 57
- Epsom 57
- Exeter 57
- Farmington 57
- Fremont 57
- Gilmanton 57
- Goffstown 57
- Greenland 57
- Greenville 57
- Hampstead 57
- Hampton 57
- Hampton Beach 57
- Hampton Falls 57
- Hollis 57
- Hudson 57
- Kensington 57
- Kingston 57
- Lee 57
- Litchfield 57
- Lyndeborough 57
- Madbury 57
- Madison 57
- Manchester 57
- Mason 57
- Merrimack 57
- Milford 57
- Mont Vernon 57
- Moultonborough 57
- Nashua 57
- New Boston 57
- New Durham 57
- New Ipswich 57
- Newmarket 57
- Newton 57
- North Conway 57
- North Hampton 57
- Northwood 57
- Nottingham 57
- Pelham 57
- Pembroke 57
- Pinardville 57
- Pittsfield 57
- Plaistow 57
- Raymond 57
- Rochester 57
- Rye 57
- Sandown 57
- Seabrook 57
- South Hooksett 57
- Strafford 57
- Stratham Station 57
- Tamworth 57
- Temple 57
- Tuftonboro 57
- Wilton 57
- Windham 57
- Wolfeboro 57
- Alexandria 56
- Alstead 56
- Andover 56
- Antrim 56
- Ashland 56
- Belmont 56
- Boscawen 56
- Bridgewater 56
- Bristol 56
- Canterbury 56
- Center Harbor 56
- Contoocook 56
- Danbury 56
- Deering 56
- Dublin 56
- Enfield 56
- Fitzwilliam 56
- Francestown 56
- Franklin 56
- Gorham 56
- Grafton 56
- Grantham 56
- Greenfield 56
- Harrisville 56
- Henniker 56
- Hill 56
- Hillsborough 56
- Hinsdale 56
- Holderness 56
- Hopkinton 56
- Jackson 56
- Jaffrey 56
- Lempster 56
- Marlborough 56
- New London 56
- Newbury 56
- Newport 56
- North Woodstock 56
- Northfield 56
- Plymouth 56
- Richmond 56
- Rindge 56
- Rumney 56
- Salisbury 56
- Sanbornton 56
- Springfield 56
- Sunapee 56
- Swanzey 56
- Thornton 56
- Tilton 56
- Tilton-Northfield 56
- Unity 56
- Weare 56
- Webster 56
- West Swanzey 56
- Westmoreland 56
- Wilmot 56
- Winchester 56
- Woodstock 56
- Berlin 55
- Charlestown 55
- Claremont 55
- Haverhill 55
- Jefferson 55
- Lebanon 55
- Lyme 55
- Milan 55
- North Haverhill 55
- Orford 55
- Randolph 55
- Whitefield 55
- Woodsville 55
- Lancaster 54
- Brentwood 53
- Dover 53
- Groveton 53
- Keene 53
- Northumberland 53
- Salem 53
- Stratford 52
- Concord 51
- Meredith 51
- Barnstead 49
- Deerfield 49
- Sutton 49
- Brookline 48
- Suncook 48
- Hooksett 47
- Colebrook 46
- Londonderry 46
- Portsmouth 46
- West Lebanon 46
- Hanover 44
- Chesterfield 43
- Littleton 42
- Sandwich 42
- Laconia 41
- Barrington 40
- Gilford 37
- Conway 35
- Peterborough 35
- Effingham 33
- Troy 33
AQI US, Metric