Chapter 13: Air Pollution - Worth County School District
Air Pollution 3/11/2014 Describe how we can reduce the amounts of CO2 in the atmosphere Answer Factories
Dust/dirt Exhaust from vehicles, etc. Air Pollutant Types
Air pollutants are airborne particles and gasses that occur in concentrations that endanger the health and well-being of organisms. Pollutants can be grouped into two categories:
(1) primary pollutants, which are emitted directly from identifiable sources, and (2) secondary pollutants, which are produced in the atmosphere when certain chemical reactions take place among primary pollutants.
Primary Pollutants The major primary pollutants include:
Secondary Pollutants Air pollution in urban and industrial areas is often called smog.
Photochemical smog, a noxious mixture of gases and particles, is produced when strong sunlight triggers photochemical reactions in the atmosphere. The major component of photochemical smog is ozone. Controlling Air Pollution
through Regulations The Clean Air Act of 1970 mandated the setting of standards for four of the primary pollutants
particulates, sulfur dioxide, carbon monoxide, and Nitrogen as well as the secondary pollutant ozone.
Have Regulations Helped? In 1997, the emissions of the five major primary pollutants in the United States were
about 31 percent lower than 1970. In 1990, Congress passed the Clean Air Act Amendments, which further tightened controls on air quality. Air Pollution Occurrences
Two of the most important atmospheric conditions affecting the dispersion of pollutants are: (1) the strength of the wind and (2) the stability of the air.
Air Mixing The vertical distance between Earth's surface and the height to which convectional movements extend is called the mixing depth. Inversions
Temperature inversions represent a situation in which the atmosphere is very stable and the mixing depth is significantly restricted. Surface temperature inversions form because the
ground is a more effective radiator than the air above. Inversion An Inversion Aloft Acid Precipitation
This acidic rain or snow, formed when sulfur and nitrogen oxides produced as by-products of combustion and industrial activity are converted into acids, called acid precipitation. Acid Precipitation (cont.)
Besides producing water that is toxic to fish, acid precipitation has also detrimentally altered ecosystems. Healthy lungs Asbestos
Lung cancer Key Terminology Natural air pollution Secondary pollutants Photochemical smog Ozone Mixing depth
Latin Examples meliōra et maiōra facit nē vītam misserrimam agat. arma parēmus nē lībertās nostra tollātur. Chapter 28 Jussive and Purpose Clauses Jussive Clauses A Jussive clause is one of the independent uses of the Subjunctive mood in Latin. By...
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