How much of Colorado’s air quality is beyond state control?

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.