The World Health Organization (WHO) released updated Air Quality Guidelines (AQGs) today that aim to save millions of lives from air pollution. The new guidelines are based on a marked increase in scientific evidence that show air pollution damages human health at even lower concentrations than previously thought. The WHO last released updated Air Quality Guidelines in 2005. After a systematic review of the accumulated evidence since then, almost all the pollutant levels have been adjusted downward with the WHO warning that exceeding the new air quality guideline levels is associated with significant risks to health. At the same time, however, adhering to them could save millions of lives. Read more..