Variable
acenaphthene
acenaphthylene
anthracene
arsenic
benz_a_anthracene
benzo_a_pyrene
benzo_bj_fluoranthenes
benzo_ghi_perylene
benzo_k_fluoranthene
cadmium
chromium
chrysene
dibenzo_ah_anthracene
fluoranthene
fluorene
inden_123cd_pyrene
lead
naphthalene
nickel
phenanthrene
pyrene
zinc