What are the major air pollution problems?

One of the major air pollution problems are caused by high levels of carbon monoxide that are emitted from gasoline driven road and farm vehicles. These emissions and others from gasoline driven engines produce unclean air which damages the human body and the general environment.
Other sources of major air pollution come from some large nations that are building more manufacturing plants. If these factories are burning coal to enable them to operate, then adequate measures can be taken to filter the factory emissions as they are pushed into the atmosphere and travel via winds to pollute the air in locations thousands of miles away from the sources of the air pollution.