O2 …oxygen

N2….Nitrogen

CO2….Carbon dioxide

CO……Carbon Monoxide

CH4…..Methane

H2O……Water

O3……Ozone

He…Helium (in a balloon)

List of gases around neighbourhood

Natural gas

Liquefied Petroleum Gas (LPG)

Syngas: various synthetic fuel gases: names include coal gas, water gas, illuminating gas, wood gas, producer gas, holzgas, air gas, blue gas, manufactured gas, town gas, hygas

Oxygen Gas

Nitrogen Gas etc are the others i can think of…

however i’m not sure whther Water Vapour is a Gas,, its Water in Gaseous State…

i think its Argon in lightbulbs

inside a car engine the petrol changes from liquid to vapour

plants churn out oxygen

if you have a gas-lift office chair, that has gas in it but i dont know which

….ok im scraping the barrel now!

freon in air conditioning, fridges

hellium in celebration greeting ballons

butane in camping,caravan stoves

methane in animal,human,garbage waste

hope this helps

propane (C3H8)

methane (CH4)

Oxygen (O2)