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.Know More
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
Primary memory is the internal working memory of a computer, and it includes RAM and the cache. Secondary storage is also called external memory, and it includes the computer’s hard drive.Full Answer >
Some of the ways to help protect and stop the depletion of the ozone layer include not buying products in aerosol cans, maintaining air-conditioning filters and units, using mass public transit or riding a bike instead of driving, and purchasing energy saving light bulbs and appliances. The ozone layer protects the earth from the suns harmful ultraviolet rays.Full Answer >
Primary data is raw information collected by researchers for a specific purpose. Secondary data is information obtained by studying the reports of other researchers.Full Answer >
Primary cells are batteries that are not easily recharged after use, while secondary cells are those which can be recharged. Usually, primary cells are discarded after a single use, while secondary cells are used over and over again.Full Answer >