Fig. 6

Mutagenicity of the burn pit smoke PM in the TA98 -S9 and TA100 + S9 Salmonella strains. A TA98 + S9, B TA98 -S9, and C TA100 + S9. Mutagenic potencies (rev/µg PM) of the extractable organic material (EOM) were calculated from the slope of the linear portion of the dose–response curve created by the average of the primary data (rev/plate) from two to four independent mutagenicity experiments (Additional file 1: Figs. S2 and S3). The mutagenic potencies of the EOM were then multiplied by the percent EOM to give mutagenic potencies of the PM (rev/µg PM). Data are presented as mean ± SEM. *These values were statistically significant (p < 0.05). ^$Samples with slopes with trend tests with p > 0.05 were considered non-mutagenic and given a mutagenic potency of zero. ^vInsufficient sample available to generate dose–response curves; samples were not mutagenic at 1000 µg EOM/plate