The correct option is D All of the above
Air pollution occurs when harmful substances are added to earth's atmosphere. Carbon monoxide is a toxic air pollutant produced due to the incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, oil, coal, and wood largely from vehicle emissions. CFCs are widely used as coolants in refrigeration and air conditioners. They cause air pollution and are the main cause of stratospheric ozone depletion. SPM stands for suspended particulate matter that includes dust, fumes, mist, and smoke that pollute the air. Thus the correct answer is option D.