Figure 3From: Effects of long-term exposure to air pollution on respiratory function and physical efficiency of pre-adolescent children Correlations between annual percentage increases in sulfur dioxide (SO 2 ) (Panels A and C) and carbon monoxide (CO) (Panels B and D) concentrations and vital capacity (VCd) and forced expiratory volume in one-second (dFEV 1 d) deficits.Back to article page