Tuesday, June 15, 2021, 4:30 p.m. MDT
Ozone levels are expected to be in the medium to unhealthy range on Tuesday and Wednesday.
– Unhealthy Tuesday ozone levels will be mostly limited to the western suburbs of Denver, north through Boulder, to Ft. Collins area. In these areas, active children and adults as well as people with lung diseases such as asthma should avoid prolonged or heavy outdoor exertion; everyone else, especially children, should reduce prolonged or heavy outdoor exertion by Tuesday evening.
– Ozone should be slightly lower on Wednesday, however unhealthy for sensitive ozone concentrations are possible for locations in the southern and western parts of the Greater Denver area and north along the Front Range and Lower Foothills, including Boulder, Longmont, Fort Collins and Greeley. In these areas, active children and adults as well as people with lung diseases such as asthma should reduce prolonged or heavy outdoor exertion on Wednesdays from noon to 8 p.m.
The fine dust concentrations are expected to be in the good to medium range on Tuesday and Wednesday. Due to smoke from off-state fires, moderate levels of particulate matter are possible across the Colorado Front Range. Unusually sensitive people should consider reducing prolonged or heavy exertion on Tuesday and Wednesday.
Carbon monoxide levels are expected to be in the Good category on Tuesday and Wednesday.
Nitrogen dioxide levels are expected to be in the Good category on Tuesday and Wednesday.
Visibility in Denver is expected to be poor in the morning on Wednesday and improve to moderate in the afternoon.
COLORADO SMOKE VIEW:
Tuesday, June 15, 2021, 2:10 PM MDT
Areas of light to moderate smoke development are possible in parts of Delta, Mesa, and Garfield Counties, especially in valleys. The smoke will gradually decrease in the late morning hours, however any increase in fire activity in the Pack Creek wildfire in eastern Utah can increase smoke generation in these areas, especially in the late evening and night hours.
In these areas, as well as other parts of Colorado not mentioned above, forest fires in Arizona, New Mexico, and Utah can result in foggy skies and generally light to moderate levels of smoke. Across Colorado, especially in locations on the Western Slope, mountain valleys, and busier metropolitan areas, unusually sensitive people should consider reducing prolonged or heavy exertion on Tuesdays and Wednesdays.
What if there is wildfire or smoke near you?
The Colorado Smoke Outlook focuses on major fires (e.g. larger than 100 acres). Even so, smoke from smaller fires, mandatory fires and / or smoke from new fires that are not yet known
CDPHE meteorologists for air quality can cause heavy smoke development locally. If there is smoke in your neighborhood, read the following public health recommendations.
Public health recommendations for smoke-exposed areas:
If the smoke is thick, or is getting thick in your neighborhood, you may want to stay indoors. This is especially true for people with heart disease, respiratory disease, the very young and the elderly. Consider limiting outdoor activities if there is moderate to heavy smoke. Consider moving temporarily if there is smoke indoors and it is making you sick. IF THE VISIBILITY IN YOUR NEIGHBORHOOD IS LESS THAN 5 MILES IN SMOKE, SMOKE HAS REACHED UNHEALTHY LEVELS.