What is the major source of human emissions of air pollution in the upper atmosphere Quizlet

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.

Pollution On The Move

Pollution from human-generated and natural sources is often created in one place and transported through the air. Sometimes chemical reactions in the atmosphere change pollutants before they are deposited. Pollutants in the air can create haze, making it harder to see, and pollutant deposition can have biological effects. NPS areas experience these effects just like other places. Location and even the time of year can determine which pollution sources are most important to each park.

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. Learn more about effects of air pollution on nature and visibility, and human health.

Last updated: January 17, 2018

In the United States, most of the emissions of human-caused (anthropogenic) greenhouse gases (GHG) come primarily from burning fossil fuels—coal, natural gas, and petroleum—for energy use. Economic growth (with short-term fluctuations in growth rate) and weather patterns that affect heating and cooling needs are the main factors that drive the amount of energy consumed. Energy prices and government policies can also affect the sources or types of energy consumed.

Sources of GHG emissions estimates

The U.S. Environmental Protection Agency (EPA) publishes estimates for total U.S. greenhouse gas emissions to meet annual U.S. commitments under the United Nations Framework Convention on Climate Change (UNFCCC).1 The U.S. Energy Information Administration (EIA) publishes estimates for energy-related carbon-dioxide (CO2) emissions (emissions resulting from conversion of energy sources/fuels to energy) by fuel source and by fuel consuming sector by month and year.2

Carbon dioxide

In 2020, CO2 emissions accounted for about 79% of total U.S. anthropogenic GHG emissions (based on 100-year global warming potential). Fossil fuel combustion (burning) for energy accounted for 73% of total U.S. GHG emissions and for 92% of total U.S. anthropogenic CO2 emissions. CO2 emissions from other anthropogenic sources and activities were about 6% of total GHG emissions and 8% of total CO2 emissions.

• Methane (CH4), which comes from landfills, coal mines, agriculture, and oil and natural gas operations
• Nitrous oxide (N22O), which comes from using nitrogen fertilizers and certain industrial and waste management processes and burning fossil fuels
• High global warming potential (GWP) gases, which are human-made industrial gases
  • Hydrofluorocarbons (HFCs)
  • Perfluorocarbons (PFCs)
  • Sulfur hexafluoride (SF6)
  • Nitrogen trifluoride (NF3)

The combined emissions of these other greenhouse gases accounted for about 21% of total U.S. anthropogenic GHG emissions in 2020.

In 2020, fossil fuels were the source of about 73% of total U.S. human-caused (anthropogenic) greenhouse gas emissions.

The energy connection

Fossil fuels consist mainly of carbon and hydrogen. When fossil fuels are combusted (burned), oxygen combines with carbon to form CO2 and with hydrogen to form water (H2O). These reactions release heat, which we use for energy. The amount of CO2 produced (emitted) depends on the carbon content of the fuel, and the amount of heat produced depends on the carbon and hydrogen content. Because natural gas, which is mostly CH4, has a high hydrogen content, combustion of natural gas produces less CO2 for the same amount of heat produced from burning other fossil fuels. For example, for the same amount of energy produced, burning natural gas produces about half of the amount of CO2 produced by burning coal.

About half of U.S. energy-related CO2 emissions were from petroleum use in 2021

In 2021, petroleum accounted for about 36% of U.S. energy consumption but petroleum was the source of 46% of total annual U.S. energy-related CO2 emissions. Natural gas also provided about 32% U.S. energy and accounted for 34% of total annual energy-related CO2 emissions. Coal was the source of about 12% of U.S. energy use and of about 21% of total annual energy-related CO2 emissions.

The transportation sector accounts for largest share of U.S. energy-related CO2 emissions

Consumption of fossil fuels accounts for most of the CO2 emissions of the major energy consuming sectors: commercial, industrial, residential, transportation, and electric power. Although the industrial sector was the largest end-use (includes direct primary energy use and electricity purchases from the electric power sector) energy consuming sector in 2021, the transportation sector emitted more CO2 because of its near complete dependence on petroleum fuels.

Emissions by the electric power sector can be allocated to each energy end-use sector according to each end-use sector’s share of total annual electric power retail electricity sales. Even when these electric emissions are apportioned to each sector, the transportation sector accounted for the largest share of U.S. energy end-use CO2 emissions in 2021.

Natural gas was the largest source of industrial sector CO2 emissions in 2021, followed by the sector's associated electric emissions, and then by petroleum and coal consumption. Most of the CO2 emissions associated with energy use by the residential and commercial sectors can be attributed to their associated electric emissions.

Coal is the dominant CO2 emissions source related to electricity generation

In 2021, the electric power sector accounted for about 38% of total U.S. primary energy consumption and for about 32% of total U.S. energy-related CO2 emissions. Coal accounted for 59% and natural gas for 40% of electric power sector CO2 emissions. Emissions from burning petroleum fuels and non-biomass waste (mainly plastics) in waste-to-energy power plants and emissions from some types of geothermal power plants accounted for about 2% of power sector CO2 emissions.

Last updated: June 24, 2022, with data from sources as indicated.

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