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Table 2 Range of dilutions, details of methane reference gas and expected PPM

From: Characterisation of an aerosol exposure system to evaluate the genotoxicity of whole mainstream cigarette smoke using the in vitro γH2AX assay by high content screening

Dilutions Expected PPM with 10% methane Expected PPM with 50% methane Expected PPM with 100% methane
1:25 4000   
1:50 2000   
1:100 1000   
1:250 400   
1:500 200   
1:1000 100   
1:1500 67   
1:2000   250  
1:3000   167  
1:4000   125  
1:6000   83  
1:8000   63  
1:16000    63
1:20000    50