EPA today confirmed that New Englanders experienced a slight increase in the number of unhealthy air quality days this year, compared to 2014 and 2013.Based on preliminary data collected between April and September 2015, there were 24 days when ozone monitors in New England recorded concentrations above levels considered healthy. By contrast, in 2014 there were a total of 9 unhealthy ozone days, and in 2013 there were a total of 20 such days.The number of unhealthy ozone days in each state this summer is as follows:- 22 days in Connecticut (compared to 8 in 2014, and 18 in 2013)- 4 days in Rhode Island (0 in 2014, and 7 in 2013)- 3 days in Massachusetts (0 in 2014, and 6 in 2013)- 2 days in Maine (0 in 2014, and 5 in 2013)- 2 days in New Hampshire (1 in 2014, and 3 in 2013)- 0 days in Vermont (0 in both 2014, and 2013).