Why isn’t recent outdoor air monitoring data available? Where can I find that?

EPA regulations give reporting organizations (states, tribes, and local agencies) 90 days following the end of a calendar quarter to submit their data to AQS to allow time for analysis and quality assurance, though many reporting organizations submit data prior to the 90-day deadline. Even so, at any point in the year, it is possible that the most recent data in AQS could be up to six months old.
To help bridge this time gap, AQS pulls recent ozone and PM data from the AirNow system for matching sites. Data summaries and graphics on the AirData website that display AQI or daily concentrations utilize this AirNow data, where available, to supplement AQS data. If AQS data exists for a site on a given day, then it is used. Otherwise, AirNow data, if available, is used. The AirNow data is pulled every night (in the early morning hours), so the previous day’s concentrations are available. Each nightly pull of AirNow data looks back three days to capture any corrections that might have occurred in the last three days. Additionally, a 30-day data pull occurs at the end of every month to capture any data corrections that might have occurred outside the rolling three-day pull.
If you cannot find recent monitoring data, you can also contact the reporting agency.

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