Vehicle emissions contributes to ozone pollution, which is intensified on really hot days. But there are other ozone pollutants beyond the state air-quality agency's control, including wildfires (Fire), natural emissions from vegetation (Biogenic) and bad air from surrounding states or other oil and gas drilling (Boundary or Offshore) or other countries (Canada/Mexico and Offshore). Here is how the EPA projects other ozone contaminants (in parts per billion) will air quality in 2023 for Front Range counties that have failed to attain a healthy EPA air quality standard. The goal is to get to 70 ppb. Note: Two ozone monitoring sites in Jefferson County are included.
Source: Mesa County Valley School District 51
Data Design: Eric Lubbers, The Colorado Sun