Ozone Monitors in New England
In New England, the states and other organizations operate a network of approximately 60 ozone monitoring stations during the ozone season (i.e., April 1 through September 30).

Region 1: EPA New England
In New England, the states and other organizations operate a network of approximately 60 ozone monitoring stations during the ozone season (i.e., April 1 through September 30).
