Air Pollution PM 2.5 Fine particles and particulate matter and air pollution explained how this invisible pollutant is affecting us what are the safe PM 2.5 levels, who might be effected the most and what can we do about the Air Quality do air purifiers really help?
General Info on PM 2.5 http://www.health.ny.gov/environmental/indoors/air/pmq_a.htm
World Health Organisation http://www.who.int/mediacentre/factsheets/fs313/en/
