PurpleAir Blog

  • US Air Quality Fact Sheet 2021

    While studies show that air quality in the US is significantly better than it was 50 years ago, the World Health Organization (WHO) is updating its standards of what acceptable air quality is.

    With the WHO’s new safety guidelines of no more than 5 µg/m³ of particulate pollution, it seems that the vast majority of Americans (~97%) are at risk of unsafe levels of air pollution.