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"Air Quality Action Days" are called when air quality in the Baltimore/Washington region is expected to reach unhealthy levels. Air Quality Action Days are designed to help combat the problem of ground-level ozone pollution by encouraging voluntary actions that reduce the amount of ozone-causing pollutants. This is especially important on days when weather conditions are favorable for ozone formation. These are generally hot (90+ degrees), sunny days with little or no wind and no precipitation.
A color-coded system has been developed for communicating the expected level of ozone pollution and corresponding health risks and suggested actions. On Code Red Air Quality Action Days, the following buses are free: - Ride On
- Metro buses in Northern Virginia, Montgomery County and Prince Georges County
- Fairfax Connector
- Arlington Transit ART
- PRTC OmniRide
- Fairfax City CUE
- Alexandria DASH
- Loudoun County Transit commuter bus service
- Loudoun Transit fixed route service
- PRTC OmniLink
- Falls Church GEORGE buses
- Prince Georges County THE BUS
- Frederick County TransIT
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