This page lists the 2007 season daily peak 8-hour-averaged ozone concentrations at MassDEP monitors across Massachusetts, color-coded according to health-based Air Quality Index categories (see Ozone Health Guidelines for an explanation of the colors).

Values shown are preliminary. Quality assurance checks may, for a small number of values, result in slight changes.

Monthly Ozone Data

Color-coded daily peak 8-hour-averaged concentrations at Massachusetts monitors

Ozone concentrations are reported in parts per billion (PPB). For example, a concentration of 38 means there was an average of 38 parts of ozone for every billion parts of air on that day at that location. "M" denotes that data is missing for that day at that location because of equipment or network problems, or a newly installed monitor not being operational yet.

May 2007
MS Excel 21 KB | PDF 21 KB

June 2007
MS Excel 20 KB | PDF 13 KB

July 2007
MS Excel 22 KB | PDF 22 KB

August 2007
MS Excel 21 KB | PDF 13 KB

September 2007
MS Excel 23 KB | PDF 25 KB