Air Pollution PPT Download Free
Air Pollution PPT Free Download. Get paper presentation about Air Pollution Definition, Air Pollutant, Health Effects and more on Air Pollution PPT.
Air Pollution Definition
Air pollution may be defined as the presence in the air (outdoor atmosphere) of one or more contaminants or combinations thereof in such quantities and of such durations as may be or tend to be injurious to human, animal or plant life, or property, or which unreasonably interferes with the comfortable enjoyment of life or property or conduct of business.
- It is a substance or effect dwelling temporarily or permanently in the air , which adversely alters the
- environment by interfering with the health, the comfort, or the food chain, or by interfering with the property values of people.
- A pollutant can be solid (large or sub-molecular), liquid or gas.
- It may originate from a natural or anthropogenic source (or both).
- It is estimated that anthropogenic sources have changed the composition of global air by less than 0.01%.
- However, it is widely accepted that even a small change can have a significant adverse effect on the climate, ecosystem and species on the planet.
- Examples of these are acid rain, ozone in the lower atmosphere, and photochemical smog.
Health Effects of Nitrogen Oxides
• Short-term exposure at concentrations greater than 3 parts per million (ppm) can measurably decrease lung function.
• Concentrations less than 3 ppm can irritate lungs.
• Concentrations as low as 0.1 ppm cause lung irritation and measurable decreases in lung function in asthmatics.
• Long-term lower level exposures can destroy lung tissue, leading to emphysema.
• Children may also be especially sensitive to the effects of nitrogen oxides.
• Seriously injure vegetation at certain concentrations. Effects include:
– Bleaching or killing plant tissue.
– Causing leaves to fall.
– Reducing growth rate.
• Deteriorate fabrics and fade dyes.
• Corrode metals (due to nitrate salts formed from nitrogen oxides).
• Reduce visibility.
• Oxides of nitrogen, in the presence of sunlight, can also react with hydrocarbons, forming photochemical
oxidants or smog.
• Also, NOx is a precursor to acidic precipitation, which may affect both terrestrial and aquatic ecosystems.
Air Pollution PPT Contents:
- Air Pollutant
- Health Effects of Nitrogen Oxides
- Other Effects
- Sulfur Dioxide
- Other sulfur-containing compounds
- Health Effects of Sulfur Oxides
- and more
Filename : Air Pollution PPT Added :29 February, 2012 (19:20) Category : Energy and Environment Posted by :tukimin