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Air pollution is a major environmental issue that has a detrimental global impact and requires urgent attention. The concentration of air pollutants in the outside air has risen sharply due to the growing population and various human activities, such as the burning of fossil fuels and industrial processes.

Air pollution is defined as the presence of excessive amounts of certain substances in the air, such as gases, particulate matter, and biological molecules. These pollutants can adversely affect the environment, human health, and even wildlife.

There are various sources of air pollution, such as factories and power plants, vehicles, burning of wood and coal, agricultural activities, and dry cleaning chemicals. The most common air pollutants include particulate matter, carbon monoxide, nitrogen dioxide, sulfur dioxide, and ozone.

Particulate matter (PM) is the collective term for a variety of tiny solid particles and liquid droplets found in air. PM can have a variety of sources, including burning of fossil fuels, industrial activities, vehicle emissions, wildfires, and wildfires. Long-term exposure to these particles can cause a variety of respiratory and cardiovascular diseases, as well as an increased risk of lung cancer.

Carbon monoxide (CO) is a colorless and odorless gas that is a by-product of incomplete combustion of fossil fuels such as gasoline, oil, and natural gas. Long-term exposure to CO can cause decreased oxygen supply to the heart and an increased risk of stroke and heart disease.

Nitrogen dioxide (NO2) is an odorless gas that is released into the air from burning of fossil fuels, such as in vehicles and power plants. NO2 is a precursor of ground-level ozone, a major component of smog. Long-term exposure to high levels of NO2 can cause respiratory irritation and increase the risk of asthma attacks and other lung diseases.

Sulfur dioxide (SO2) is a colorless gas released from burning of coal, oil, wood, and other fuels. Long-term exposure to SO2 can cause lung irritation and respiratory issues.

Ozone (O3) is a naturally occurring gas, but is also a major component of smog. Ozone can cause inflammation in the lungs, as well as irritation in the eyes, nose, and throat. Long-term exposure to high levels of ozone can increase the risk of lung disease and other respiratory illnesses.

The health risks associated with air pollution are numerous and can be just as damaging as exposure to smoking or asbestos. The World Health Organization (WHO) estimates that air pollution may cause about 7 million premature deaths annually. Air pollution's contribution to global warming is also an area of major concern. The emissions of air pollutants such as carbon dioxide, methane, and nitrous oxide contribute to the increasing levels of greenhouse gases in the atmosphere, which in turn lead to an increase in global temperatures.

Various strategies have been implemented in order to reduce the levels of air pollutants. These include increased use of renewable energy sources, reformulating fuels, and developing more efficient engines, as well as implementing regulations on emissions. Furthermore, conserving energy and using public transportation can also help to reduce air pollution levels.