A report by the WMO concluded that classical models based on the concentration of microparticles can underestimate by up to 93% the mortality due to fires. Contamination from increasingly fierce fires and heat waves undermine global efforts to improve air quality and the protection of people's health, the World Meteorological Organization (WMO) warned today. In its annual report on air quality, the WMO warns of an increase in “extreme forest fir…