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Historical Air Quality Data

Use the form below to search and view historical air quality data.

Note: This data has not been through QA Analysis. The data available here are data collected directly from the moritoring stations across the state. It has not been reviewed for accuracy, nor have past values been modified to reflect current advancements in pollutant calculation algorithms. View data which has been through the QA process.

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On March 12, 2008 EPA promulgated a revised 8-hour standard for ground-level ozone at 0.075 ppm (75 ppb). It became effective June 12, 2008.  On September 16, 2009 EPA announced that it will reconsider the Ozone standard and issue a proposal before the end of the year.  It is quite likely that the proposed ozone standard will be lower than 0.075 ppm.

EPA has revised standards for particle pollution. The particle pollution standard specifically addresses particles smaller than 2.5 microns (PM2.5). The PM2.5 standard is 15 micrograms per cubic meter based on an annual average and 35 micrograms per cubic meter on a 24-hour average.  In early 2009, EPA stated that the PM2.5 annual standard would be reconsidered.