Colorado public health officials issued an air quality alert for the Front Range through Tuesday afternoon because of potential for unhealthy levels of ozone.
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An ozone action day alert is in effect until 4 p.m. because ozone levels may reach levels that are unhealthy for sensitive groups, according to the Colorado Department of Public Health and Environment.
The alert includes western Adams, western Arapahoe, Boulder, Broomfield, Denver, Jefferson, Larimer and Weld counties.
Active children and adults and people with lung disease like asthma are more likely to experience respiratory symptoms and should avoid prolonged or heavy exercise outdoors, agency officials said.
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