Migration Worldwide President John F. Kennedy, A Nation of Immigrants There is, of course, a legitimate argument for some limitation upon immigration. We no longer need settlers for virgin lands, and our economy is expanding more slowly than in the nineteenth and early twentieth century. We will have doubled in 57 years.
Pollutant and Greenhouse gas An air pollutant is a material in the air that can have adverse effects on humans and the ecosystem. The substance can be solid particles, liquid droplets, or gases.
A pollutant can be of natural origin or man-made. Pollutants are classified as primary or secondary. Primary pollutants are usually produced by processes such as ash from a volcanic eruption.
Other examples include carbon monoxide gas from motor vehicle exhausts or sulphur dioxide released from the factories.
Secondary pollutants are not emitted directly. Rather, they form in the air when primary pollutants react or interact. Ground level ozone is a prominent example of secondary pollutants.
Some pollutants may be both primary and secondary: Before flue-gas desulphurization was installed, the emissions from this power plant in New Mexico contained excessive amounts of sulphur dioxide. Schematic drawing, causes and effects of air pollution: Thermal oxidisers are air pollution abatement options for hazardous air pollutants HAPsvolatile organic compounds VOCsand odorous emissions.
Substances emitted into the atmosphere by human activity include: Carbon dioxide CO2 — Because of its role as a greenhouse gas it has been described as "the leading pollutant"  and "the worst climate pollution". Clean Air Act is deemed to regulate CO2 emissions.
SO2 is produced by volcanoes and in various industrial processes. Coal and petroleum often contain sulphur compounds, and their combustion generates sulphur dioxide.
Nitrogen oxides NOx — Nitrogen oxides, particularly nitrogen dioxideare expelled from high temperature combustion, and are also produced during thunderstorms by electric discharge. They can be seen as a brown haze dome above or a plume downwind of cities.
Nitrogen dioxide is a chemical compound with the formula NO2.
It is one of several nitrogen oxides. One of the most prominent air pollutants, this reddish-brown toxic gas has a characteristic sharp, biting odor. Carbon monoxide CO — CO is a colorless, odorless, toxic yet non-irritating gas.
It is a product of combustion of fuel such as natural gas, coal or wood. Vehicular exhaust contributes to the majority of carbon monoxide let into our atmosphere.
It creates a smog type formation in the air that has been linked to many lung diseases and disruptions to the natural environment and animals. Inmore than half of the carbon monoxide emitted into our atmosphere was from vehicle traffic and burning one gallon of gas will often emit over 20 pounds of carbon monoxide into the air.
Methane is an extremely efficient greenhouse gas which contributes to enhanced global warming. Other hydrocarbon VOCs are also significant greenhouse gases because of their role in creating ozone and prolonging the life of methane in the atmosphere.
This effect varies depending on local air quality. The aromatic NMVOCs benzene, toluene and xylene are suspected carcinogens and may lead to leukemia with prolonged exposure.
Particulatesalternatively referred to as particulate matter PMatmospheric particulate matter, or fine particles, are tiny particles of solid or liquid suspended in a gas. In contrast, aerosol refers to combined particles and gas.
Some particulates occur naturally, originating from volcanoes, dust storms, forest and grassland fires, living vegetation, and sea spray.
Human activities, such as the burning of fossil fuels in vehicles, power plants and various industrial processes also generate significant amounts of aerosols. Averaged worldwide, anthropogenic aerosols—those made by human activities—currently account for approximately 10 percent of our atmosphere.Summary Counties in the The United States government, through the EPA, assists the states by providing scientific research, By promoting pollution reduction, the Clean Air Act can help reduce heightened exposure to air pollution among communities of color and low-income communities.
Despite dramatic progress cleaning the air since , air pollution in the United States continues to harm people’s health and the environment. Overview of the Final Clean Power Plan, what it is, why it is needed, how it works It also shows the world that the United States is committed to leading global efforts to address climate change.
The Clean Power Plan will reduce carbon pollution from power plants, the nation’s largest source, while maintaining energy reliability and.
Clean Air Act - This law was an important first step in our national air pollution control program. It provided funds for research on the sources and effects of air pollution.
It was the first federal legislation to acknowl-edge that air pollution was not a local problem, but a problem that crossed the boundaries of local and state jurisdictions.
Pollution Issues. Learn about the different types of pollution in your community and what you can do about them. With member countries, staff from more than countries, and offices in over locations, the World Bank Group is a unique global partnership: five institutions working for sustainable solutions that reduce poverty and build shared prosperity in developing countries.