Archived Ozone Monitoring Seasons and Waivers for the 2008 Ozone National Ambient Air Quality Standard

This reference includes tables of archived ozone monitoring seasons (Table 1) and monitoring season waivers (Table 2) for the 2008 Ozone National Ambient Air Quality Standard. Prior to the 2017 end-year, the National Park Service ozone quality conditions & trends were determined using the 2008 ozone standard monitoring season and waivers. The data were initially retrieved from the EPA’s ozone seasons webpage (https://aqs.epa.gov/aqsweb/documents/codetables/ozone_seasons.html). The 2008 ozone standard monitoring seasons are no longer available online but are available in Table 1. Note that some ozone monitors received ozone season waivers for the 2008 standard but were not found on the EPA’s ozone seasons webpage. Table 2 has a list of all ozone monitors that have received ozone season waivers under the 2008 ozone standard monitoring season requirements. The waivers are in EPA Region 9: Arizona, California, and Nevada. The last two columns in the Table 2 indicate the year the waiver first took effect and the year the waiver ended for each monitor. These waivers do not apply to the 2015 ozone standard monitoring season requirements that take effect in 2017.