Science
Science Folio
Chapter 5
B6D5E1
Title: Importance of maintaining the cleanliness of air
Introduction
The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night. One of the most important factors drawing international attention which is a dangerous threat to the ecosystem is air pollution. The atmosphere, which makes up the largest fraction of the biosphere, is a dynamic system that continuously absorbs a wide range of solids, liquids and gases from both natural and manmade sources. These substances travel through air, disperse and react with one another and with other substances both physically and chemically. Most of these constituents, eventually find their depository such as the ocean, or to a receptor such as man. Various amounts of contaminants continuously enter the atmosphere through both natural and manmade processes present on the earth. That portion of these substances which interacts with the environment to cause toxicity, disease, aesthetic distress, physiological effects or environmental decay, has been labeled by man as a pollutant. Air pollution is the contamination of the atmosphere by any toxic or radioactive gases and particulate matter as a result of human activity. There are 5 major air pollutants such as carbon monoxide (CO), sulphur oxides (SO, SO2, SO3), particulates, hydrocarbons, and photochemical oxidants. The composition of air
The average percentage of its components by volume
Nitrogen
78%
Oxygen
21%
Inert gases & Others
0.97%
Carbon dioxide
0.03%
Air Pollution Air pollution is the introduction into the atmosphere of chemicals, particulates, or biological materials that cause discomfort, disease, or death to humans, damage other
Chapter 5
B6D5E1
Title: Importance of maintaining the cleanliness of air
Introduction
The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night. One of the most important factors drawing international attention which is a dangerous threat to the ecosystem is air pollution. The atmosphere, which makes up the largest fraction of the biosphere, is a dynamic system that continuously absorbs a wide range of solids, liquids and gases from both natural and manmade sources. These substances travel through air, disperse and react with one another and with other substances both physically and chemically. Most of these constituents, eventually find their depository such as the ocean, or to a receptor such as man. Various amounts of contaminants continuously enter the atmosphere through both natural and manmade processes present on the earth. That portion of these substances which interacts with the environment to cause toxicity, disease, aesthetic distress, physiological effects or environmental decay, has been labeled by man as a pollutant. Air pollution is the contamination of the atmosphere by any toxic or radioactive gases and particulate matter as a result of human activity. There are 5 major air pollutants such as carbon monoxide (CO), sulphur oxides (SO, SO2, SO3), particulates, hydrocarbons, and photochemical oxidants. The composition of air
The average percentage of its components by volume
Nitrogen
78%
Oxygen
21%
Inert gases & Others
0.97%
Carbon dioxide
0.03%
Air Pollution Air pollution is the introduction into the atmosphere of chemicals, particulates, or biological materials that cause discomfort, disease, or death to humans, damage other