07-11-2017, 04:27 PM
Hi I'm suman...i want to that cause of air pollution pdf in bengali languag.....so please help
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environment air pollution bengali pdf download
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Hi I'm suman...i want to that cause of air pollution pdf in bengali languag.....so please help
08-11-2017, 09:22 AM
Air pollution occurs when harmful substances, such as particles and biological molecules, are introduced into the Earth's atmosphere. It can cause diseases, allergies or the death of humans; It can also cause damage to other living organisms, such as animals and food crops, and can damage the natural or built environment. Human activity and natural processes can generate air pollution.
Indoor air pollution and poor urban air quality are among the worst two problems of toxic pollution in the world in The Worst Places Polluted Report of the World's Worst Institute 2008. According to the 2014 report of the World Health Organization, the Air pollution in 2012 caused the death of around 7 million people worldwide, an estimate echoed by one of the International Energy Agency.
An air pollutant is a substance in the air that can have adverse effects on humans and the ecosystem. The substance can be solid particles, liquid droplets or gases. A contaminant can be of natural or artificial origin. The contaminants are classified as primary or secondary. Primary pollutants are usually produced from a process, such as the ashes of a volcanic eruption. Other examples include the carbon monoxide gas from the exhaust of motor vehicles or the sulfur dioxide released from the factories. Secondary contaminants are not emitted directly. Instead, they form in the air when primary pollutants react or interact. Ground-level ozone is a prominent example of a secondary pollutant. Some pollutants can be both primary and secondary: both are emitted directly and are formed from other primary pollutants.
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