Fig. 4

CO and particle exposure based on class type. A Average instructor CO 8 h TWA by class type. B Peak CO 8 h TWA by class type. C Average instructor particle concentration LDSA 8 h TWA by class type D Peak LDSA by class type. Data are represented individual values along with bars representing the mean ± SEM. *p < 0.05 JBC versus all WPAFB. #p < 0.05 v JBC M4/M9. ^p < 0.05 v WPAFB M9. §p < 0.05 versus WPAFB M4