Benzo[a]pyrene and metabolites
formula: ; CAS Registry Number:
Substances
- 
  3-OH-Benzo[a]pyrene
 
Specimen
- 
  Student groups with an even number of female and male students at the age of 20 to 29.
 
Sampling area
- 
  4 university cities as sampling areas.
 
Sampling period
1995 - 2019