The expected particle pollution levels are the result of cold, calm air and temperature inversions that limit air movement and trap pollutants in valley areas, state officials said in a statement Tuesday.
Anyone with heart or lung conditions such as asthma, emphysema, and bronchitis, as well as children and elderly people, should consider limiting strenuous or prolonged activity Wednesday, state officials said.
Air quality is expected to improve Thursday morning as wind speeds increase, resulting in better mixing and cleaner air, state officials said.
For more information, contact the N.H. Department of Environmental Services at 271-1370. Air quality forecasts are available by calling 1-800-935-SMOG, or at www.airquality.nh.gov.