449
AEUS75 KBOU 212313
AQABOU
AIR QUALITY ALERT MESSAGE
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
RELAYED BY NATIONAL WEATHER SERVICE BOULDER CO
410 PM MDT TUE JUL 21 2026
COC005-069-059-031-035-013-001-123-014-222200-
ARAPAHOE-LARIMER-JEFFERSON-DENVER-DOUGLAS-BOULDER-ADAMS-
WELD-BROOMFIELD-
410 PM MDT TUE JUL 21 2026
...OZONE ACTION DAY ALERT FROM 400 PM TUESDAY UNTIL 400 PM
WEDNESDAY...
THE COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT HAS
ISSUED THE FOLLOWING...
WHAT...OZONE ACTION DAY ALERT.
WHERE...DOUGLAS, JEFFERSON, DENVER, WESTERN ARAPAHOE, WESTERN
ADAMS, BROOMFIELD, BOULDER, LARIMER, AND WELD COUNTIES
WHEN...400 PM TUESDAY JULY 21 TO 400 PM WEDNESDAY JULY 22
IMPACTS...OZONE ACTION DAY ALERT IS NOW IN EFFECT FOR THE FRONT
RANGE URBAN CORRIDOR. HOT AND SUNNY WEATHER WITH LIMITED CHANCES
FOR AFTERNOON STORMS WILL ALLOW OZONE CONCENTRATIONS TO REACH THE
UNHEALTHY FOR SENSITIVE GROUPS CATEGORY ON TUESDAY AND WEDNESDAY.
ON TUESDAY ELEVATED OZONE IS POSSIBLE IN THE DENVER METRO AREA,
FORT COLLINS, GREELEY, AND SURROUNDING AREAS. ON WEDNESDAY THE
HIGHEST OZONE IS EXPECTED TO BE CONFINED TO LOCATIONS WITHIN THE
DENVER METRO AREA. FOR COLORADO AIR QUALITY CONDITIONS, FORECASTS,
AND ADVISORIES, VISIT:
HTTPS://WWW.COLORADO.GOV/AIRQUALITY/COLORADO_SUMMARY.ASPX IF
POSSIBLE, PLEASE HELP US REDUCE OZONE POLLUTION BY LIMITING
DRIVING GAS AND DIESEL-POWERED VEHICLES UNTIL AT LEAST 4 P.M.
WEDNESDAY, JULY 22, 2026. COLORADO IS ALSO ADDRESSING OZONE
POLLUTION THROUGH STATE POLICIES. FOR MORE INFORMATION ABOUT
HEALTH IMPACTS AND HOW OZONE POLLUTION FORMS IN COLORADO, VISIT:
HTTPS://CDPHE.COLORADO.GOV/OZONE- POLLUTION-AND-YOUR-HEALTH
HEALTH INFORMATION...INCREASING LIKELIHOOD OF RESPIRATORY SYMPTOMS
AND BREATHING DISCOMFORT IN ACTIVE CHILDREN AND ADULTS AND PEOPLE
WITH LUNG DISEASE, SUCH AS ASTHMA. ACTIVE CHILDREN AND ADULTS, AND
PEOPLE WITH LUNG DISEASE, SUCH AS ASTHMA, SHOULD REDUCE PROLONGED
OR HEAVY OUTDOOR EXERTION.
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