a non_western constant vacuum is poisonous
gaseous_perfluoroisobutene is poisonous_gas. gaseous_cyanogen_chloride is poisonous_gas. poisonous_gas is chemically_harmful_substance. ammonium_phosphate is toxic_substance. nerve_gas is poisonous_gas. silver_chloride is toxic_substance. poisonous_gas is toxic_substance. hydrogen_sulfide is toxic_substance. gaseous_phosgene is poisonous_gas. carbon_monoxide is toxic_substance.