Fig. 1From: Coal burning-derived SO2 and traffic-derived NO2 are associated with persistent cough and current wheezing symptoms among schoolchildren in Ulaanbaatar, Mongoliaa Map of Ulaanbaatar. b The locations of the urban study sites; A, B: apartments (white), C: “gers” (black). c The location of the suburban site; D: apartments (white), “gers” (black)Back to article page