Air pollutants that are emitted directly from a source are considered primary pollutants, as they can be released from natural ways or human action. Secondary pollutants are those that are not directly emitted from a source but form when primary pollutants react chemically in the atmosphere. There are some pollutants that are both primary and secondary; while they are emitted from a source directly, they are also made from other pollutants as well.Continue Reading
An example of a primary pollutant is SO2, produced by coal burning power stations. Nitrous Dioxide is a mainly a secondary air pollutant that is formed the oxidation of nitric oxide, a primary pollutant that is produced by fossil and traffic fuels released into the environment by power stations. Volcanic ash and particles are other examples of naturally released primary pollutants.
Ozone is another example of a secondary pollutant. It is formed when hydrocarbons and nitrogen oxides combine in the presence of sunlight. Secondary pollutants are harder to control because they have different ways of synthesizing; they are most often made naturally in the environment. They also cause problems like photochemical smog.
Primary pollutants in the air can cause serious environmental problems such as global warming and acid rain.Learn more about Pollution
The main causes of air pollution include the emission of greenhouse gases, such as carbon dioxide, methane, and chlorofluorocarbons, emission from volcanic eruptions and toxic air pollutants emitted by vehicles. The amount of smog as well as the damaging effects on health and the environment indicate the severity of air pollution.Full Answer >
Air pollution includes particulate materials and toxic pollutants that come from many different sources. Particulate materials include large particles, such as dust, lead or asbestos, and small particles, including nitrates and sulfates. Toxic pollutants are particles that have a significant impact on health. Air transport moves pollutants from their sources to their deposit location.Full Answer >
Fertilizer ranks toward the top of the list when it comes to pollutants that have harmful effects on aquatic ecosystems by adding chemicals and disrupting ecosystem functions. They do considerable amounts of damage in short periods of time. Fertilizers may impact aquatic ecosystems as point source and nonpoint sources of pollution, but regardless of entry, their effects are profound.Full Answer >
River pollution comes from a variety of different sources, including agricultural operations, industrial discharge, wastewater treatment plants and storm water runoff, that carry pollutants into waterways. Sources are classified as point sources if the pollution comes from a single, identifiable source and nonpoint sources if the pollution is the result of runoff over a wide area. Since rivers draw from many sources, they may contain many different pollutants.Full Answer >