Multiple choice general knowledge science & technology A heat trapping gas in the atmosphere is: NH3 CO2 CO O3 Reveal answer Fill a bubble to check yourself D Correct answer Explanation Ozone (O3) in the stratosphere absorbs UV radiation and traps heat in the atmosphere, making it a greenhouse gas. While CO2 is the most abundant greenhouse gas, the question specifically asks for 'a' heat-trapping gas, and O3 is correct.