HSC 4201 Chapter Notes - Chapter 14: Bronchitis, Nitrogen Dioxide, Asthma
Document Summary
Is the contamination of the air by substances in amount great enough to harm humans, other living organisms, or the ecosystem or that alter climate: substances can be: These contaminants or pollutants can arise from natural or human sources: natural sources include: Volcanic eruptions: human sources can be divided into: Electric power plants fueled by oil and coal. Industry, primarily mills and refineries: smaller sources: Polluting chemicals are generally divided into primary and secondary pollutants: primary pollutants . Include those emanating directly from the sources listed previously. Formed when primary pollutants react with one another or with other atmospheric components to form new harmful chemicals. Sunlight promotes the formation of these secondary pollutants. Smog is referred to as photochemical smog (brown smog) This term is used to contract photochemical smog with industrial smog (gray smog) formed primarily by sulfur dioxide and suspended solid particles.
