Pungent gas ,respiratory problems and acid rain contributor.

Non-toxic normally; high concentrations can cause suffocation

Highly toxic; corrosive leaks pose immediate health dangers.

Reactive gas; causes respiratory issues and lung damage

Corrosive gas; severe respiratory damage upon contact or inhalation

Significant pollutant; irritates lungs, contributes to urban smog.

                                              Asphyxiants displace oxygen, causing oxygen deficiency and harm.

                                                  Highly flammable; major explosion risk, global warming contributor

                                                Flammable gas; leaks can lead to fires, explosions

Highly flammable; significant explosion risk, potential health hazards, contributes to global warming and air pollution.

"Rotten egg" smell; highly toxic and explosively dangerous.

Highly toxic and flammable; harmful to respiratory systems, skin, and eyes; may cause burns and long-term health effects.

Extremely toxic; affects respiratory functions, can be fatal

diameter of 10 micrometers or less; can cause respiratory issues, cardiovascular problems, and aggravate existing health conditions.

Fine particulate matter with a diameter of 2.5 micrometers or less; highly hazardous to health, capable of penetrating deep into the lungs, causing respiratory and cardiovascular diseases.

Ultrafine particulate matter with a diameter of 1 micrometer or less; can enter the bloodstream, posing serious health risks, including neurological and cardiovascular effects.

                                                          Toxic, corrosive, volatile, strong oxidizer, irritates eyes/skin, respiratory damage, environmental hazard, ozone depletion contributor.

Toxic, corrosive, flammable, reacts violently with water, tissue burns, bone damage, environmental hazard, acid rain contributor.

                                                        Highly toxic, lung damage, non-flammable, corrosive, toxic byproducts, environmental hazard, ozone depletion contributor.

Toxic, corrosive, flammable, respiratory burns, skin/eye irritation, reacts violently, environmental hazard, acid rain contributor.

                                                 Highly toxic, flammable, neurotoxic, carcinogenic, volatile, CNS damage, environmental hazard, water/soil contamination.

Minimum concentration of gas in air required for ignition; varies by gas, indicates explosion risk.

Flammable, highly combustible, LEL 2.1%, UEL 9.5%, causes explosions in confined spaces, used in heating and cooking.    

Flammable, LEL 1.2%, UEL 7%, used as solvent, vapor inhalation can cause health issues, explosive risk

Mixture of propane/butane, highly flammable, LEL 2%, UEL 9.5%, used for cooking, heating, and industrial purposes

                                          Methane-based, highly flammable, LEL 5%, UEL 15%, common fuel, explosive in confined spaces, greenhouse gas contributor.

                                                                                                          Highly flammable, LEL 1.8%, UEL 8.4%, used in lighters, fuel, and refrigerants, explosive in high concentrations.

Highly flammable, LEL 1.8%, UEL 8.4%, used in lighters, fuel, and refrigerants, explosive in high concentrations.

                                          Colorless gas; irritates eyes, skin, respiratory system; carcinogenic, neurotoxic.

                                          Colorless gas, used in agriculture, plastic production, highly flammable.

Colorless liquid solvent, derived from petroleum, toxic with prolonged exposure.

Volatile solvent, used in industries, flammable, and fast-evaporating.