Air Quality Favourable in Denver-Boulder Area on July 5, 2025

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Air Quality Favourable in Denver-Boulder Area on July 5, 2025

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Denver’s air quality for today, July 5, 2025, is generally favorable, with no official advisories in effect for ozone or any other major pollutant in the Denver-Boulder area or the surrounding Front Range Urban Corridor until at least 4 p.m. The Air Quality Index for fine particulate matter, known as PM2.5, was recorded at 55 earlier this morning, which falls in the moderate range. For most people, this means the air quality is acceptable, but some individuals who are unusually sensitive may experience mild respiratory symptoms. Those with heart or lung diseases, older adults, and especially sensitive people are advised to consider reducing prolonged or heavy outdoor exertion.

Ozone concentrations are expected to stay in the good to moderate range throughout the day. While this indicates generally clean air for the majority of residents, people who are particularly sensitive to ozone should minimize outdoor activity, especially from noon until 10 p.m. when concentrations tend to be higher. Ground-level ozone, formed when pollutants from vehicles and industrial sources react in sunlight, can cause breathing discomfort and trigger asthma, so it’s prudent for at-risk groups to be cautious during the warmest parts of the afternoon.

Other major pollutants, including carbon monoxide and nitrogen dioxide, are forecasted to remain in the good range. Visibility in the area is also expected to be between good and moderate through the day, suggesting that hazy conditions will be minimal. Officials note that ground-level ozone is a persistent air quality concern along the Front Range each summer. Even without an active advisory, individuals with respiratory sensitivities should stay alert to changing conditions, especially during outdoor activities in the heat of the day. For most residents and visitors, today’s conditions support regular outdoor activities with only minor precautions needed for those who are unusually sensitive to air pollution[1].