From the National Weather Service:
Air Quality Alert
MAZ007-012>023-120200- Eastern Essex MA-Southern Worcester MA-Western Norfolk MA- Southeast Middlesex MA-Suffolk MA-Eastern Norfolk MA- Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA- Southern Bristol MA-Southern Plymouth MA-Barnstable MA-Dukes MA- Including the cities of Gloucester, Milford, Worcester, Foxborough, Norwood, Cambridge, Boston, Quincy, Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Chatham, Falmouth, Provincetown, and Vineyard Haven 1029 PM EDT Sat Jun 10 2017 ...AIR QUALITY ALERT IS IN EFFECT FROM 10 AM TO 10 PM SUNDAY... The Massachusetts Department of Environmental Protection has issued an Air Quality Action Day, in effect from 10 AM to 10 PM EDT Sunday. An Air Quality Action Day means that Ground Level Ozone concentrations within the region may approach or exceed unhealthy standards. For additional information, please visit the Massachusetts Department of Environmental Protection website at: http://public.dep.state.ma.us/MassAir, or call 1-800-882-1497.