State officials say current unhealthy ozone concentrations will spread in New Hampshire through mid-week. Rockingham County remains under an air quality alert through Wednesday. Joining it Tuesday and Wednesday are Hillsborough County and any area above 3,000 feet in elevation – some mountainous parts in the North Country. Jeff Underhill is the state's chief air quality scientist . He says the high ozone levels come from heat, sun and winds carrying pollution. "Air pollution can travel long distances faster at higher elevations, so it's not uncommon for us to see – when the air quality turns bad, for it to start to turn bad at higher elevations first,” he says. Underhill says children, the elderly and people with certain health issues should avoid...
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Southeast N.H., Higher Elevations Will See Poor Air Quality This Week