: Absorbed into the bloodstream to damage specific organs or cellular respiration. Hydrogen cyanide is a potent systemic toxin. Common Toxic Gases and Sources Common Sources Key Characteristics Carbon Monoxide (CO) Incomplete combustion (engines, heaters) Colorless, odorless, "silent killer" Hydrogen Sulfide (H₂S) Manure decomposition, sewers, oil refining "Rotten egg" smell; paralyzes sense of smell at high levels Chlorine (Cl₂) Water treatment, industrial manufacturing Greenish-yellow; pungent bleach-like odor Ammonia (NH₃) Fertilizers, industrial refrigeration Sharp, pungent odor; severe respiratory irritant Phosgene (COCl₂) Plastics and pesticide production
: Deprive the body of oxygen. Chemical asphyxiants (e.g., carbon monoxide) interfere with oxygen transport in the blood, while simple asphyxiants (e.g., nitrogen or argon) displace breathable oxygen in confined spaces. poison gas
: Cause severe chemical burns and painful blistering on contact. Mustard gas is the most well-known agent in this category. : Absorbed into the bloodstream to damage specific
Smells like "moldy hay"; effects can be delayed for 48 hours Historical Use in Warfare Chemical asphyxiants (e