Journal-Courier: Smog hanging over urban and industrial center is the most obvious form of air pollution. Visible or invisible, it contributes to global warming.
Among the possible pollutants of the atmosphere, six stand out: Particulate matter; ground-level ozone; carbon monoxide; sulfur dioxide; nitrogen oxides; and lead. These pollutants do not only harm living beings, they also damage the environment. Particle pollution and ground-level ozone are the most widespread threats to life.
According to the American...