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.
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
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 >
Nuclear power offers the same or better electricity generation capabilities as coal but without the dangerous air pollution coal generation produces. Nuclear power also has advantages in terms of energy density, as a single small uranium pellet can produce the same amount of energy as an entire ton of coal. On the other hand, nuclear power brings with it the possibility of catastrophic accidents that may release radiation.Full Answer >
A secondary source uses information from a primary source, firsthand source, or other secondary source to describe or analyze a source. Secondary sources provide a subjective view of an account.Full Answer >
The difference between component and HDMI video is the way the signal is delivered from the source to the display device. HDMI delivers the signal in a digital format, while component video delivers the signal in an analog format.Full Answer >