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 | 41 |
| 2 | Dover | 38 |
| 3 | Keene | 32 |
| 4 | Concord | 31 |
| 5 | Suncook | 28 |
| 6 | Londonderry | 27 |
| 7 | Brentwood | 25 |
| 8 | Effingham | 24 |
| 9 | Brookline | 21 |
| 10 | Hooksett | 21 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
33 Contributors
See all
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 41
- Dover 38
- Keene 32
- Concord 31
- Suncook 28
- Hollis 27
- Londonderry 27
- Mason 27
- Nashua 27
- Greenville 26
- Hudson 26
- New Ipswich 26
- Rindge 26
- Atkinson 25
- Bedford 25
- Brentwood 25
- Danville 25
- Derry 25
- Derry Village 25
- East Kingston 25
- East Merrimack 25
- Fitzwilliam 25
- Hampstead 25
- Jaffrey 25
- Kensington 25
- Kingston 25
- Litchfield 25
- Lyndeborough 25
- Manchester 25
- Merrimack 25
- Milford 25
- Mont Vernon 25
- Newton 25
- North Woodstock 25
- Pelham 25
- Pinardville 25
- Plaistow 25
- Richmond 25
- Salem 25
- Sandown 25
- Temple 25
- Windham 25
- Auburn 24
- Chester 24
- Effingham 24
- Exeter 24
- Francestown 24
- Fremont 24
- Goffstown 24
- Greenfield 24
- Hampton 24
- Hampton Beach 24
- Hampton Falls 24
- Hinsdale 24
- New Boston 24
- North Hampton 24
- Rye 24
- Seabrook 24
- South Hooksett 24
- Winchester 24
- Candia 23
- Dublin 23
- Epping 23
- Greenland 23
- New Castle 23
- Newmarket 23
- Raymond 23
- Stratham Station 23
- Durham 22
- Lee 22
- Madbury 22
- Nottingham 22
- Randolph 22
- Rollinsford 22
- Allenstown 21
- Bow Bog 21
- Brookline 21
- Epsom 21
- Harrisville 21
- Hooksett 21
- Marlborough 21
- Northwood 21
- Pembroke 21
- Peterborough 21
- Rochester 21
- Somersworth 21
- Swanzey 21
- Weare 21
- Antrim 20
- Chichester 20
- Deering 20
- East Concord 20
- Pittsfield 20
- Strafford 20
- West Swanzey 20
- Westmoreland 20
- Chesterfield 19
- Contoocook 19
- Farmington 19
- Hopkinton 19
- Sutton 19
- West Lebanon 19
- Barrington 18
- Henniker 18
- Hillsborough 18
- Laconia 17
- Boscawen 16
- Canterbury 16
- New Durham 16
- Webster 16
- Barnstead 15
- Belmont 15
- Franklin 15
- Gilford 15
- Gilmanton 15
- Northfield 15
- Salisbury 15
- Sanbornville 15
- Tilton 15
- Tilton-Northfield 15
- Wakefield 15
- Alstead 14
- Sanbornton 14
- Wolfeboro 14
- Andover 13
- Hill 13
- Lempster 13
- Newbury 13
- Ossipee 13
- Tuftonboro 13
- Wilmot 13
- Bristol 12
- Center Harbor 12
- Charlestown 12
- Danbury 12
- Freedom 12
- Moultonborough 12
- New London 12
- Newport 12
- Sunapee 12
- Unity 12
- Alexandria 11
- Ashland 11
- Bridgewater 11
- Claremont 11
- Grafton 11
- Grantham 11
- Holderness 11
- Madison 11
- Plymouth 11
- Springfield 11
- Tamworth 11
- Enfield 10
- Lebanon 10
- North Conway 10
- Rumney 10
- Lyme 9
- Meredith 9
- Thornton 9
- Woodstock 9
- Orford 8
- Gorham 7
- Hanover 7
- Haverhill 7
- Jackson 7
- North Haverhill 7
- Whitefield 7
- Woodsville 7
- Berlin 6
- Jefferson 6
- Littleton 6
- Sandwich 6
- Troy 6
- Wilton 6
- Deerfield 5
- Groveton 5
- Lancaster 5
- Milan 5
- Northumberland 5
- Stratford 5
- Colebrook 4
- Conway 3
AQI US, Metric