The document discusses several environmental issues affecting Pakistan, including air pollution. It defines air pollution as dangerous contaminants found in the atmosphere, either as gases or particles. The fundamental causes of air pollution are identified as industrialization and the widespread use of fossil fuels, population growth increasing demand for goods produced through natural resource use, and globalization allowing polluting industries to move to developing countries. The effects of air pollution are described as harmful to humans, animals, trees and the environment through entering the body primarily via the respiratory system.