AIR STAGNATION ADVISORY
Warning Issue Date: 1217 AM PST THU DEC 24 2009
AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST
SATURDAY...
AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST
SATURDAY FOR PARTS OF HARNEY AND BAKER COUNTY.
* AIR QUALITY...WILL BE DETERIORATING IN THE COLDER VALLEYS AND
BASINS DUE TO ACCUMULATION OF PARTICULATE MATTER WHERE THERE
WILL BE LITTLE OR NO AIR MOVEMENT.
* IMPACTS...AFFECTING PERSONS WITH RESPIRATORY PROBLEMS AND
PERSONS ENGAGED IN STRENUOUS OUTDOOR ACTIVITIES. SMALL SIZE
PARTICULATES ARE OF GREAT CONCERN BECAUSE THEY CAN BE INHALED
DEEPLY INTO THE LUNGS WHERE THEY CAN REMAIN FOR YEARS. THE
HEALTH EFFECTS OF PARTICULATE MATTER VARY WITH THE SIZE...
CONCENTRATION... AND CHEMICAL COMPOSITION OF THE PARTICLES.
* OBSERVATIONS...MAXIMUM VALUES WEDNESDAY OF SMALL
PARTICULATES...PM2.5...WERE 40.4 AT 5 AM IN BAKER CITY AND 54.6
AT 9 PM IN BURNS OREGON. VALUES ARE IN MICROGRAMS PER CUBIC
METER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT
OF AN AIR MASS ACROSS THE ADVISORY AREA...POLLUTION WILL INCREASE
TO DANGEROUS LEVELS. PERSONS WITH RESPIRATORY ILLNESS SHOULD
FOLLOW THEIR PHYSICIANS ADVICE FOR DEALING WITH HIGH LEVELS OF
AIR POLLUTION.
$$
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