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 |  Sandwich | 46 |
| 2 | Deerfield | 31 |
| 3 | West Lebanon | 28 |
| 4 | Effingham | 27 |
| 5 | Portsmouth | 25 |
| 6 | Littleton | 24 |
| 7 | Hanover | 19 |
| 8 | Concord | 18 |
| 9 | Laconia | 17 |
| 10 | Londonderry | 17 |
(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 | 0 |
| 2 | Troy | 1 |
| 3 | Barrington | 3 |
| 4 | Chesterfield | 4 |
| 5 | Peterborough | 4 |
| 6 | Gilford | 5 |
| 7 | Conway | 8 |
| 8 | Meredith | 8 |
| 9 | Barnstead | 10 |
| 10 | Brookline | 10 |
(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?
- Alstead 56
- Antrim 56
- Charlestown 56
- Claremont 56
- Deering 56
- Dublin 56
- Fitzwilliam 56
- Francestown 56
- Greenfield 56
- Harrisville 56
- Hillsborough 56
- Hinsdale 56
- Jaffrey 56
- Lempster 56
- Marlborough 56
- Newbury 56
- Newport 56
- Richmond 56
- Rindge 56
- Sunapee 56
- Swanzey 56
- Temple 56
- Unity 56
- West Swanzey 56
- Westmoreland 56
- Winchester 56
- Andover 55
- Bedford 55
- Bow Bog 55
- Contoocook 55
- East Merrimack 55
- Enfield 55
- Goffstown 55
- Grantham 55
- Greenville 55
- Henniker 55
- Hollis 55
- Hopkinton 55
- Hudson 55
- Lebanon 55
- Litchfield 55
- Lyndeborough 55
- Manchester 55
- Mason 55
- Merrimack 55
- Milford 55
- Mont Vernon 55
- New Boston 55
- New Ipswich 55
- New London 55
- Pinardville 55
- South Hooksett 55
- Springfield 55
- Weare 55
- Webster 55
- Wilmot 55
- Alexandria 54
- Allenstown 54
- Auburn 54
- Boscawen 54
- Bridgewater 54
- Bristol 54
- Candia 54
- Canterbury 54
- Chester 54
- Chichester 54
- Danbury 54
- Derry 54
- Derry Village 54
- East Concord 54
- Epsom 54
- Franklin 54
- Grafton 54
- Greenland 54
- Hill 54
- Nashua 54
- New Castle 54
- North Hampton 54
- Northfield 54
- Pelham 54
- Pembroke 54
- Rollinsford 54
- Rye 54
- Salisbury 54
- Sanbornton 54
- Somersworth 54
- Tilton 54
- Tilton-Northfield 54
- Windham 54
- Ashland 53
- Atkinson 53
- Belmont 53
- Center Harbor 53
- Danville 53
- Durham 53
- East Kingston 53
- Epping 53
- Exeter 53
- Farmington 53
- Freedom 53
- Fremont 53
- Gilmanton 53
- Hampstead 53
- Hampton 53
- Hampton Beach 53
- Hampton Falls 53
- Holderness 53
- Kensington 53
- Kingston 53
- Lee 53
- Lyme 53
- Madbury 53
- Madison 53
- Moultonborough 53
- New Durham 53
- Newmarket 53
- Newton 53
- Northwood 53
- Nottingham 53
- Ossipee 53
- Pittsfield 53
- Plaistow 53
- Plymouth 53
- Raymond 53
- Rochester 53
- Rumney 53
- Salem 53
- Sanbornville 53
- Sandown 53
- Seabrook 53
- Strafford 53
- Stratham Station 53
- Tuftonboro 53
- Wakefield 53
- Wolfeboro 53
- North Conway 52
- Tamworth 52
- Thornton 51
- Colebrook 50
- North Woodstock 50
- Berlin 49
- Gorham 49
- Jackson 49
- Milan 49
- Orford 49
- Woodstock 49
- Randolph 48
- Groveton 47
- Jefferson 47
- Northumberland 47
- Stratford 47
- Lancaster 46
- Sandwich 46
- Whitefield 46
- North Haverhill 44
- Woodsville 43
- Haverhill 41
- Deerfield 31
- West Lebanon 28
- Effingham 27
- Portsmouth 25
- Littleton 24
- Hanover 19
- Concord 18
- Laconia 17
- Londonderry 17
- Dover 16
- Brentwood 15
- Hooksett 14
- Suncook 13
- Sutton 13
- Keene 12
- Barnstead 10
- Brookline 10
- Conway 8
- Meredith 8
- Gilford 5
- Chesterfield 4
- Peterborough 4
- Barrington 3
- Troy 1
- Wilton 0
AQI US, Metric