Table 1 - Farm-related toxic gases and chemicals

From liquid manure: hydrogen sulfide, ammonia, methane, carbon dioxide

From vegtable matter: nitrogen dioxide, carbon dioxide

From gasoline-powdered machines: carbon monoxide

Chemicals

Pesticides: insecticides(organophosphates, chlorinated hydrocarbons), herbicides (paraquat), rodenticides (warfarin), fungicides (phenols), fumigants (methylbromide, carbon disulfide