Blanks (Blanks are empty cannisters that are measured for speciation quality assurance reasons).Toxics (see "Notes on Toxics" below), Ozone Precursors, and Lead.These are the standard time aggregations EPA calculates and stores Some contain raw data (sample data as reported). Some contain data summarized on a daily basis (daily summary), and Some contain data summarized on an annual basis (annual summary files), The data available here is also available via Understand the EPA ambient air quality monitoring program and data. This page contains large files of data intended for use by people who The files are updated twice per year: once in June to capture the complete data for the prior year and once in December to capture the data for the summer (ozone season). This page contains pre-generated files of data available for download.
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