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Update: Data supporting the Civic Muscle Index were updated on Friday, January 9, 2026. Have questions? Learn more here.

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  • What Is Civic Muscle?
    • Civic Muscle Framework
    • Belonging
    • Contribution
    • Leadership
    • Vitality
  • Civic Muscle Index
    • Create an Interactive Index Report
    • Methodology + Sources
    • What’s New
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  • Deep Dives + Insights
    • Who Are My Peer Counties?
    • St. Louis ZIP Dashboard
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  • About Us
    • Contact Us
  • What Is Civic Muscle?
    • Civic Muscle Framework
    • Belonging
    • Contribution
    • Leadership
    • Vitality
  • Civic Muscle Index
    • Create an Interactive Index Report
    • Methodology + Sources
    • What’s New
  • Programs + Strategies
  • Deep Dives + Insights
    • Who Are My Peer Counties?
    • St. Louis ZIP Dashboard
    • Civic Muscle Toolkit
    • Support
  • About Us
    • Contact Us

airnow

Real-time Air Quality Index (AQI) – Ozone and Particulate Matter
3 Sep 2025

Real-time Air Quality Index (AQI) – Ozone and Particulate Matter

This US EPA feature layer is updated hourly and reflects the latest hour of air quality data received from each monitoring site that reports to AirNow. The concentration and AQI values are for Ozone and Particulate Matter (PM) only. Air … Continued

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