Answer :
Let's think about this one, we know gasses rise to the top of things so does burying it in the ground prevent this also think of other ways it can get into the air (EX: into streams and taken into air via water cycle)
Answer:
By release of methane gas
Explanation:
Most of the waste in a land fill is biodegradable which releases methane gas in the air while degrading.
Methane gas is a green house gas which is able to entrap the heat radiated back by the earth. Entrapping of heat energy causes rising of global earth temperature thereby causing global warming.
Methane is much dangerous than carbon dioxide as it entraps twenty time more heat radiated by earth.
Hence , in this way solid garbage in landfills can result in air pollution.