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 |  Deerfield | 28 |
| 2 | Effingham | 28 |
| 3 | West Lebanon | 27 |
| 4 | Sandwich | 26 |
| 5 | Portsmouth | 25 |
| 6 | Littleton | 23 |
| 7 | Suncook | 21 |
| 8 | Hanover | 19 |
| 9 | Laconia | 18 |
| 10 | Dover | 16 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
34 Contributors
See all
LIVE AQI CITY RANKING
Real-time New Hampshire
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Barrington | 3 |
| 2 | Gilford | 7 |
| 3 | Chesterfield | 8 |
| 4 | Peterborough | 8 |
| 5 | Barnstead | 10 |
| 6 | Brookline | 10 |
| 7 | Conway | 10 |
| 8 | Brentwood | 11 |
| 9 | Keene | 11 |
| 10 | Concord | 12 |
(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
34Contributors
Government Contributor
- water1998
1 station
Non-profit organization Contributor
- 30 Anonymous contributors
30 stations
30 Anonymous Contributors
Which is the most polluted city in New Hampshire?
- Alstead 57
- Antrim 57
- Auburn 57
- Bedford 57
- Bow Bog 57
- Candia 57
- Chester 57
- Deering 57
- Derry 57
- Derry Village 57
- Dublin 57
- East Merrimack 57
- Fitzwilliam 57
- Francestown 57
- Freedom 57
- Goffstown 57
- Greenfield 57
- Greenville 57
- Harrisville 57
- Henniker 57
- Hillsborough 57
- Hinsdale 57
- Hollis 57
- Hudson 57
- Jaffrey 57
- Lempster 57
- Litchfield 57
- Lyndeborough 57
- Manchester 57
- Marlborough 57
- Mason 57
- Merrimack 57
- Milford 57
- Mont Vernon 57
- Nashua 57
- New Boston 57
- New Ipswich 57
- Pinardville 57
- Richmond 57
- Rindge 57
- Sanbornville 57
- South Hooksett 57
- Swanzey 57
- Temple 57
- Wakefield 57
- Weare 57
- West Swanzey 57
- Westmoreland 57
- Winchester 57
- Alexandria 56
- Allenstown 56
- Andover 56
- Ashland 56
- Atkinson 56
- Belmont 56
- Berlin 56
- Boscawen 56
- Bridgewater 56
- Bristol 56
- Canterbury 56
- Center Harbor 56
- Charlestown 56
- Chichester 56
- Claremont 56
- Colebrook 56
- Contoocook 56
- Danbury 56
- Danville 56
- Durham 56
- East Concord 56
- East Kingston 56
- Enfield 56
- Epping 56
- Epsom 56
- Exeter 56
- Farmington 56
- Franklin 56
- Fremont 56
- Gilmanton 56
- Gorham 56
- Grafton 56
- Grantham 56
- Greenland 56
- Groveton 56
- Hampstead 56
- Hampton 56
- Hampton Beach 56
- Hampton Falls 56
- Haverhill 56
- Hill 56
- Holderness 56
- Hopkinton 56
- Kensington 56
- Kingston 56
- Lebanon 56
- Lee 56
- Lyme 56
- Madbury 56
- Madison 56
- Milan 56
- Moultonborough 56
- New Castle 56
- New Durham 56
- New London 56
- Newbury 56
- Newmarket 56
- Newport 56
- Newton 56
- North Conway 56
- North Hampton 56
- Northfield 56
- Northwood 56
- Nottingham 56
- Orford 56
- Ossipee 56
- Pelham 56
- Pembroke 56
- Pittsfield 56
- Plaistow 56
- Plymouth 56
- Randolph 56
- Raymond 56
- Rochester 56
- Rollinsford 56
- Rumney 56
- Rye 56
- Salisbury 56
- Sanbornton 56
- Sandown 56
- Seabrook 56
- Somersworth 56
- Springfield 56
- Strafford 56
- Stratford 56
- Stratham Station 56
- Sunapee 56
- Tamworth 56
- Tilton 56
- Tilton-Northfield 56
- Tuftonboro 56
- Unity 56
- Webster 56
- Wilmot 56
- Windham 56
- Wolfeboro 56
- Jackson 55
- Jefferson 55
- Lancaster 55
- North Haverhill 55
- North Woodstock 55
- Northumberland 55
- Thornton 55
- Whitefield 55
- Woodstock 55
- Woodsville 55
- Deerfield 28
- Effingham 28
- West Lebanon 27
- Sandwich 26
- Portsmouth 25
- Littleton 23
- Suncook 21
- Hanover 19
- Laconia 18
- Dover 16
- Londonderry 16
- Meredith 16
- Hooksett 14
- Sutton 13
- Concord 12
- Brentwood 11
- Keene 11
- Barnstead 10
- Brookline 10
- Conway 10
- Chesterfield 8
- Peterborough 8
- Gilford 7
- Barrington 3
- Troy 1
- Salem 0
- Wilton 0
AQI US, Metric