AIR QUALITY ALERT
Warning Issue Date: 419 PM MST TUE DEC 29 2009
A STAGNATION WARNING FROM THE MONTANA DEPARTMENT OF ENVIRONMENTAL
QUALITY REMAINS IN EFFECT...
MDEQ HAS CONTINUED A STAGNATION WARNING FOR MISSOULA AND SILVER
BOW COUNTIES OF WESTERN MONTANA INCLUDING THE CITIES OF SEELEY
LAKE AND BUTTE. A STAGNATION WARNING MEANS DISPERSION CONDITIONS
ARE POOR AND NOT EXPECTED TO IMPROVE MUCH AND THAT PARTICULATE
LEVELS HAVE BEEN TRENDING UP. EXCEEDANCE OF THE NAAQS HAS ALREADY
OCCURRED OR WILL OCCUR.
DUE TO STRONG INVERSIONS UNDER A RIDGE OF HIGH PRESSURE...THE AIR QUALITY
REMAINS UNHEALTHY IN SEELEY LAKE AND BUTTE.
THOSE INDIVIDUALS WHO ARE SENSITIVE TO INCREASED PARTICULATE OR SMOKE
LEVELS ARE ENCOURAGED TO AVOID PROLONGED OR STRENUOUS OUTDOOR
ACTIVITY. ALL OTHERS SHOULD LIMIT PROLONGED OR STRENUOUS OUTDOOR
ACTIVITY. YOUR COOPERATION IS APPRECIATED.
ANOTHER STATEMENT WILL BE ISSUED ABOUT 4 PM MST TOMORROW UNLESS
CONDITIONS IMPROVE AND THE WARNING IS NO LONGER NEEDED.
PLEASE VISIT THE DEPARTMENTS WEBSITE AT.../USE LOWER CASE/...
HTTP://SVC.MT.GOV/DEQ/AQREPORT/MOSTRECENTUPDATE.ASPX FOR MORE
INFORMATION.
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