QA Analyzed Data
The data presented in files below is available for viewing or downloads and has been quality assured (QA'd).
Ozone data is the maximum 8-hour average for the day at each site.
Particle pollution data is the midnight to midnight 24-hour average for each day. Continuous particle pollution data must be adjusted to the federal reference method (FRM) monitoring data. The particle pollution data presented below is QA'd FRM-like 24-hour averages. The adjustment factor is revised periodically. When the adjustment factor has been revised these files will be replaced with QA'd particle pollution data using the most current adjustment factor. If you are using this data for research or other analyses it is advisable that you download all the pertinent particle pollution data at the same time to ensure that you are not trying to compare apples to oranges.