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Maryland Air Quality

Current AQI at 19 monitors, highest 50 (Good) · Measured 10/26/2026, 3:00 PM PT

Monitors
19
Highest AQI
50
Good
Typical (median)
42
Good
Above 100
0

Monitoring sites in Maryland

Worst first. Times are local.

  • 50AldinoGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 46PG Equestrian CenterGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 45BeltsvilleGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 45Fair HillGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 44MillingtonGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 44PadoniaGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 44Piney RunGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 44South CarrollGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 43Southern MarylandGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 42EssexGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 42RockvilleGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 40CalvertGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 39Frederick AirportGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 39HU-BeltsvilleGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 38Blackwater NWRGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 37HagerstownGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 34Horn PointGood · Ozone · Mon 10/26/2026, 5:00 PM EDT
  • 34Howard County Near RoadGood · Fine particles (PM2.5) · Mon 10/26/2026, 5:00 PM EDT
  • 32EdgewoodGood · Ozone · Mon 10/26/2026, 5:00 PM EDT

By county

Highest current AQI among the county's monitors

What the AQI means

  • 0-50Good. Air quality is satisfactory and poses little or no risk.
  • 51-100Moderate. Acceptable. A few unusually sensitive people may have symptoms.
  • 101-150Unhealthy for Sensitive Groups. People with heart or lung disease, older adults, children and teens should limit long or heavy outdoor exertion.
  • 151-200Unhealthy. Everyone may begin to feel effects. Sensitive groups should avoid long or heavy outdoor exertion.
  • 201-300Very Unhealthy. Health alert: the risk of health effects is increased for everyone.
  • 301-500Hazardous. Health warning of emergency conditions. Everyone is more likely to be affected.

Frequently asked questions

Where is the air worst in Maryland right now?
Aldino has the highest current reading at AQI 50 (Good).
How often are readings updated?
Monitors report every hour. We refresh this page with the latest hour from EPA AirNow.

Source: EPA AirNow · Last updated 10/26/2026 · Data are preliminary and subject to change