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AirHistory

Helena Orsini

Air Quality Data Editor

EPA Air Quality System (AQS) monitor readings, AQI trends, and the Air Quality Grade

Helena Orsini leads how AirHistory reads and presents EPA Air Quality System (AQS) monitor data. The role decides which pollutants, vintages, and AQI day counts each city, county, and state page uses, documents how the Air Quality Grade is computed, and triages data corrections. Annual-average PM2.5, ozone, and AQI figures are drafted with AI assistance and editorially reviewed against the underlying EPA AQS releases, with the as-of date and monitor-coverage caveats shown on every page.

Areas of focus

EPA AQS monitor dataAQI buckets and day countsPM2.5 and ozone annual averagescounty and state air-quality trendsmonitor-coverage caveats

How our content is produced

Content is produced by an AI-augmented editorial team: research and drafting are AI-assisted and reviewed by the named desk editor against primary public-data sources before publication.

See our Editorial Policy, Fact-Checking Policy, and Corrections Policy.

← Meet the full editorial team