Question

cattle contribute to air pollution because they release which greenhouse gas? ozone oxygen water vapor methane

Explanation:

Cattle release methane, a greenhouse gas. Methane traps heat in the atmosphere, contributing to air pollution. Ozone (in the troposphere) is a pollutant but not from cattle. Oxygen is not a greenhouse gas. Water vapor is a greenhouse gas but not mainly from cattle. Methane from cattle's digestive processes is the key contributor here.

Answer:

methane