After a summer of smoky skies, we need to address indoor air quality

Even though buildings may have better indoor air quality, the pollutants that enter from the outside can be much more harmful over time.

 Buildings may have better air quality than the outside, but over time, the exposure to pollutants that enter from the exterior can be significantly worse. Buildings may have better air quality than the outside, but over time, the exposure to pollutants that enter from the exterior can be significantly worse. 

Even though buildings may have better indoor air quality, the pollutants that enter from the outside can be much more harmful over time.