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- A "heads-up" message issued by the Department of Natural Resources (DNR) through the National Weather Service when ozone levels may reach dangerous levels the next day. This message encourages residents to prevent air pollution by postponing the use of lawn mowing, motor vehicles, boats, as well as filling their vehicle gas tanks.
NOAA National Weather Service - Cite This Source - This Definition
- DNR, Doc, Ozone Advisory, SGFNT, SIGWX