Air Pollution PNG Transparent Images

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Submitted by on Mar 15, 2021

Air pollution occurs when harmful or excessive amounts of substances enter the Earth’s atmosphere. Sources of air pollution include gases (such as ammonia, carbon monoxide, sulfur dioxide, nitrogen oxides, methane and chlorofluorocarbons), particles (organic and inorganic), and biological molecules. It can cause illness, allergies and even death in people; it can also harm other living organisms such as animals and food crops and damage natural or built environments. Both human activities and biological processes can cause air pollution.

Air pollution is a significant risk factor for several pollution-related diseases, including respiratory infections, heart disease, COPD, stroke and lung cancer. The impact of human health on poor air quality is far-reaching but mainly affects the body’s respiratory and cardiovascular systems. Individual responses to air pollutants depend on the type of pollutant the person is exposed to, the degree of exposure, and their health and genetics. Indoor air pollution and poor urban air quality are listed as two of the most severe toxic pollution problems globally in the Kuznetsov Institute’s Worst Pollution Report 2008. Outdoor air pollution alone causes between 2.1 and 4.21 million deaths a year. About 7 million people die annually from air pollution worldwide, and it is the most significant health risk in the world.

The global economy estimates the loss in productivity and deterioration in the quality of life caused by air pollution at $5 trillion a year. Various pollution control technologies and strategies are available to reduce air pollution. Air pollutants are airborne materials that can adversely affect people and the ecosystem. The substance can be solid particles, liquid droplets or gases. The pollutant can be of natural or artificial origin. Pollutants are classified as primary and secondary. Primary pollutants are usually formed from processes such as ash from a volcanic eruption. Other examples include gaseous carbon monoxide from car exhaust gases or sulfur dioxide emitted from factories. Secondary pollutants are not directly emitted. Instead, they form in the air when primary pollutants react or interact. Ground-level ozone is a prime example of a secondary pollutant. Some pollutants can be both primary and secondary: both are emitted directly and are formed by other primary pollutants.


Air pollutant emission factors are representative values that attempt to relate the number of pollutants emitted to the atmosphere with the activity that releases that pollutant. These factors are usually expressed as the weight of the pollutant divided by the unit of weight, volume, distance or duration of the activity emitting the pollutant (for example, kilograms of particles emitted per tonne of coal burned).

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