In Boulder County, like most urban areas, modern metropolitan living creates air pollution. In winter, local air pollution problems are aggravated by temperature inversions, which trap pollutants near the ground. In the Boulder Valley and along the front range, this creates an unhealthy "brown cloud", and poor air quality. In summer, high levels of ozone can accumulate in the Boulder Valley and can impact public health.
No Drive Day : What a difference a day makes!
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