Question

passage- what are major sources of air pollution​

Answer 1

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Most air pollution, harmful gases and particles in the air, affecting national parks is created outside park boundaries.

Types of Sources

There are four main types of air pollution sources:

mobile sources – such as cars, buses, planes, trucks, and trains

stationary sources – such as power plants, oil refineries, industrial facilities, and factories

area sources – such as agricultural areas, cities, and wood burning fireplaces

natural sources – such as wind-blown dust, wildfires, and volcanoes

Mobile sources account for more than half of all the air pollution in the United States and the primary mobile source of air pollution is the automobile, according to the Environmental Protection Agency. Stationary sources, like power plants, emit large amounts of pollution from a single location, these are also known as point sources of pollution. Area sources are made up of lots of smaller pollution sources that aren't a big deal by themselves but when considered as a group can be. Natural sources can sometimes be significant but do not usually create ongoing air pollution problems like the other source types can.

Parks downwind of power plants that lack modern pollution controls can have increased smog. Tailpipe emissions from cars and trucks, as well as industrial processes such as oil and gas development, give rise to elevated ozone concentrations. Summertime wildfires can also reduce visibility in NPS areas. There are even examples of pollutants that originated from other countries and were transported thousands of miles arriving at parks. The effects of this pollution can be seen as haze and through negative biological effects.

Hope it helps you ✌

Answer 2

Answer:

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There are four main types of air pollution sources: mobile sources – such as cars, buses, planes, trucks, and trains. stationary sources – such as power plants, oil refineries, industrial facilities, and factories. area sources – such as agricultural areas, cities, and wood-burning fireplaces.

In large cities across the country, ozone and nitrous oxides from vehicle emissions rise to the top of air quality concerns and take their place with the general particulate matter category. Vehicle exhaust is full of extremely tiny toxic particles. During poor venting days, especially in the summer, you can see this pollution as a dense brown haze. Forty percent of the PM in that haze is from vehicles.

Explanation: