polluted gas

What Gases Are Toxic To Humans? Carbon Monoxide (CO) CO is believed to be one of the most common toxic gases on earth. … Carbon Dioxide (CO2) … Hydrogen Fluoride (HF) … Hydrogen Sulfide (H2S) … Volatile Organic Compounds. What is the most toxic gas? Sarin (inhaled) Sarin is one of the deadliest nerve gases,