Question

name two name two gases released from manhole​

Answer 1

Answer:

The insulating material starts to smoulder and catch fire, and as that spreads combustible gases like methane, hydrogen and carbon monoxide are released. As a result, pressure builds up inside the manhole or maintenance tunnel.

Answer 2

Answer:

Sewer gases may include hydrogen sulfide, ammonia, methane, esters, carbon monoxide, sulfur dioxide and nitrogen oxides.