Air Pollution:
The Dirty Truth
©2009teach.com
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Air Pollution: Types & sources of Air Pollution, C , N and S oxide Electronic Control Unit, Slides of Environmental Science
Air Pollution: Types and Sources of Air Pollution Nitrogen and Sulfur Oxides Carbon Oxides and Hydrocarbons Ozone Formation of Photochemical Smog Electronic Control Unit: The Electronic Fuel Injection system consists of three basic subsystems:- The electronic control system determines basic injection quantity based upon electrical signals from the air flow meter and engine rpm. The fuel delivery system maintains a constant fuel pressure on the injector. This allows the ECU to control the fuel injection duration and deliver the appropriate amount of fuel for engine operating conditions.
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Air Pollution:
The Dirty Truth
©2009teach.com
Types and Sources of Air
Pollution
Air Pollution:- Chemicals added to the atmosphere by natural events or human activities in high enough concentrations to be harmful
Two categories:- Primary Air Pollutant
- Harmful substance that is emitted directly into the atmosphere Secondary Air Pollutant
- Harmful substance formed in the atmosphere when a primary air pollutant reacts with substances normally found in the atmosphere or with other air pollutants
Air Pollution
Humans are the main cause of air pollution. Industry, including factories and power plants, burn large quantities of fuel. Burning coal and petroleum releases sulfur oxides and nitrogen oxide into the air. Airplanes, boats, and cars burn petroleum, releasing carbon monoxide and carbon dioxide.
©2009 abcteach.com
Air Pollution
The waste in landfills releases methane. Sulfur oxides, carbon monoxide and carbon dioxide, and methane all have a very negative effect on air quality. These pollutants can also contribute to the greenhouse effect.
©2009 abcteach.com
Pollution in MUMBAI
Sources of Outdoor Air Pollution
- Two main sources
- Transportation
- Industry
- Intentional forest fires is also high
Major Classes of Air Pollutants
o Particulate Material
o Nitrogen Oxides
o Sulfur Oxides
o Carbon Oxides
o Hydrocarbons
o Ozone
Nitrogen and Sulfur Oxides
- Nitrogen Oxides
- Gases produced by the chemical interactions between atmospheric nitrogen and oxygen at high temperature.
- Problems
- Greenhouse gases.
- Cause difficulty breathing.
- Sulfur Oxides
- Gases produced by the chemical interactions between sulfur and oxygen.
- Causes acid precipitation.
Carbon Oxides and Hydrocarbons
- Carbon Oxides - Gases carbon monoxide (CO) and carbon dioxide (CO 2 ) - Greenhouse gases
- Hydrocarbons - Diverse group of organic compounds that contain only hydrogen and carbon (ex: CH 4 - methane) - Some are related to photochemical smog and greenhouse gases
- 1 st^ **smog related deaths were in London in 1873; death toll 500 people; can you imagine how much worse the atmosphere is now?!
- Limits visibility
- Decreases UV radiation
- Yellow/black color over cities
- Causes respiratory problems and bronchial related deaths**