At this time it is urgent that we find methods to clean up the air. These pollutants are dispersed throughout the world's atmosphere in concentrations high enough to gradually cause serious health problems. Serious health problems can occur quickly when air pollutants are concentrated, such as when massive injections of sulfur dioxide and suspended particulate matter are emitted by a large volcanic eruption. You cannot escape air pollution, not even in your own home. The EPA has found that the air in some office buildings is 100 times more polluted than the air outside.
Poor ventilation causes about half of the indoor air pollution problems.
The rest come from specific sources such as copying machines, electrical and telephone cables, mold and microbe-harboring air conditioning systems and ducts, cleaning fluids, cigarette smoke, carpet, latex caulk and paint, vinyl molding, linoleum tile, and building materials and furniture that emit air pollutants such as formaldehyde. According to studies by the EPA and the National Research Council, exposure to radon is second only to smoking as a cause of lung cancer. Major sources of CO2 are fossil fuels burning and deforestation. In the hundred years and more since then, the concentration has increased by about 30 to 35 ppm that is by 10 percent. The ocean waters contain about sixty times more CO2 than the atmosphere.