Highly Toxic (Immediate Danger)
* Carbon Monoxide (CO): Colorless, odorless, and tasteless. Produced by incomplete combustion of fuels (gas, oil, wood, charcoal). Causes headaches, dizziness, nausea, and death.
* Hydrogen Cyanide (HCN): Colorless, bitter almond-like odor. Produced in fires involving plastics and some other materials. Causes rapid breathing difficulties, seizures, and death.
* Chlorine (Cl2): Yellowish-green gas with a suffocating odor. Used in water treatment and industrial processes. Causes severe respiratory problems, lung damage, and death.
* Phosgene (COCl2): Colorless gas with a musty hay-like odor. Used in chemical production and warfare. Causes fluid buildup in the lungs, leading to death.
* Sulfur Dioxide (SO2): Colorless gas with a pungent, sulfurous odor. Produced by burning fossil fuels and volcanic eruptions. Causes respiratory irritation, lung damage, and acid rain.
* Nitrogen Dioxide (NO2): Red-brown gas with a pungent odor. Produced by combustion processes and industrial emissions. Causes respiratory problems, lung damage, and acid rain.
Moderately Toxic (Long-term Health Risks)
* Ammonia (NH3): Colorless gas with a pungent, suffocating odor. Used in fertilizers, cleaning products, and industrial processes. Causes respiratory irritation, eye irritation, and skin burns.
* Ozone (O3): Colorless gas with a sharp, metallic odor. Formed by the reaction of sunlight with pollutants. Causes respiratory problems, lung damage, and premature aging.
* Formaldehyde (HCHO): Colorless gas with a pungent odor. Used in building materials, furniture, and textiles. Causes respiratory irritation, eye irritation, and cancer.
* Methane (CH4): Colorless, odorless gas. Produced by natural gas production, livestock, and landfills. Is a powerful greenhouse gas that contributes to climate change.
Important Note: The toxicity of gases can vary depending on concentration, exposure duration, and individual sensitivity. It's crucial to avoid contact with any unknown or suspected toxic gases.
