Fig. 1From: Association between PM2.5 and primary care visits due to asthma attack in Japan: relation to Beijing’s air pollution episode in January 2013Daily concentrations of particulate matter an aerodynamic diameter of ≤2.5 μm (PM2.5) from October 2012 through March 2013. The Japanese environmental quality standard for daily concentration of ambient PM2.5 is set at ≤35 μg/m3 Back to article page