The correct option (1, 2, 3, and 4) encompasses all four pollutants—carbon monoxide, methane, ozone, and sulfur dioxide—as they are byproducts of the incomplete combustion of biomass and crop residues. When biomass is burned, it releases various particulate matter and gaseous pollutants; carbon monoxide results from incomplete combustion, while methane and ozone can form through chemical reactions involving other emissions and atmospheric processes. Sulfur dioxide, emanating from the combustion of sulfur-containing materials in plant biomass, contributes to air pollution and acid rain, highlighting the environmental impacts of agricultural practices that incorporate burning. This concept underscores the need for sustainable waste management strategies in agriculture to mitigate air pollution and its associated health risks.