Pollution in Portsmouth, NH, United States
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Nearby cities:| Pollution in Andover, Massachusetts | 40.63 miles |
| Pollution in Manchester, New Hampshire | 43.91 miles |
| Pollution in Wakefield, Massachusetts | 47.73 miles |
| Pollution in Derry, New Hampshire | 50.99 miles |
| Pollution in Portland, Maine | 51.10 miles |
| Pollution in Nashua, New Hampshire | 55.74 miles |
| Pollution in Boston, Massachusetts | 56.41 miles |
| Pollution in Cambridge, Massachusetts | 58.37 miles |
| Pollution in Concord, New Hampshire | 58.79 miles |
| Pollution in Allston, Massachusetts | 60.77 miles |