Fig. 1
PM2.5 concentration monitoring and the effects of PM2.5 on the physiological metabolism in rats. a During the exposure period, the mean PM2.5 concentrations of ambient air, exposure chamber and control chamber were monitored simultaneously, 5 days per week and 8 h per day. b Changes in rats’ body weight during exposure period. c The water consumption during 24-h period in the metabolic cages. d Urinary flow rates during 24 h in the metabolic cages. Values are significantly compared to FA group: *p < 0.05, **p < 0.01, independent-sample t test