MAINE, USA — The U.S. Environmental Protection Agency (EPA) New England Regional Office confirmed Friday that New Englanders experienced a decreased number of unhealthy air quality days this past summer, compared to summer 2019.
Based on preliminary data collected between March and September 2020, there were 18 days when ozone monitors in New England recorded ozone concentrations above levels considered healthy.
By contrast, there were 23 unhealthy ozone days in New England in 2019.
The number of unhealthy ozone days in each state this summer, and for last summer are as follows, according to the EPA:
- 17 days in Connecticut (compared to 20 in 2019)
- 3 days in Massachusetts (5 in 2019)
- 4 days in Rhode Island (2 in 2019)
- 0 days in New Hampshire (1 in 2019)
- 1 day in Maine (1 in 2019)
- 0 days in Vermont (0 in 2019)
“We can all feel proud of the progress we have made in reducing ozone pollution over the past several decades,” Dennis Deziel, regional administrator of the EPA’s Region 1 office, said. “Unfortunately, portions of New England, especially coastal Connecticut, continue to experience too many days with unhealthful air quality. EPA is taking steps to improve ozone air quality, such as implementing rules to reduce air pollution from passenger cars and trucks and power plants.”
Ground-level ozone is formed when volatile organic compounds and oxides of nitrogen chemically react in the presence of sunlight. In New England, cars and trucks give off the majority of the pollution that makes ozone. Emissions from power plants, which run at high capacities on hot days generating electricity, also emit substantial amounts of ozone-making pollution. Gasoline refilling stations, print shops, household products like paints and cleaners, as well as gasoline-powered lawn and garden equipment, also contribute to ozone formation.
The number of unhealthy days (when ozone concentrations exceed the 0.070 parts per million standard) vary from year to year due to weather conditions. Hot, sunny, summery weather is conducive to ozone formation. For 2020, a cool, wet spring contributed to the record low number of exceedance days.
Since 1983, New England has experienced a decrease in the number of unhealthy ozone days. In 1983, New England had 118 unhealthy days compared with only 18 this year. This downward trend is due to a reduction in emissions that form ozone. Although the 2020 ozone season is ending, pollution from small particles in the air is a year-round concern.