Air Data - Daily Air Quality Tracker

Use of AirNow Data

This plot provides ozone and PM2.5 data from AirNow for recent days that are not available from AQS. AQS data, as it becomes available, replaces any AirNow data. The AirNow data are not fully verified and validated through the quality assurance procedures monitoring organizations use to officially submit and certify data on the EPA AQS (Air Quality System) and, therefore, cannot be used to formulate or support regulation, guidance or any other Agency decision or position.

Compare daily AQI values for any year with the 24-year high and low (2000-2023) and the five-year average (2019-2023).  You can also generate a one-page PDF report.

More information: The most recent AQI values are based on available ozone and PM2.5 data from AirNow (see "Use of AirNow Data" info box).  The 24-year high/low backdrop is based on AQS data from 2000-2023.  It shows the range of the highest and lowest daily max AQI values on each date.  The 5-year average is based on AQS data from 2019-2023.  It  shows the average of daily max AQI values on each date.

Tip: Hover over lines to display data points. Download the data using the link below the charts.

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Last updated on April 1, 2025