secondary pollutant

secondary pollutant

[¦sek·ən‚der·ē pə′lüt·ənt]
(meteorology)
An air pollutant produced by the reaction of a primary pollutant with some other component in the air.
References in periodicals archive ?
Since it is not emitted directly into the air, it is said to be a secondary pollutant.
[O.sub.3] is a secondary pollutant and has as its precursors nitrogen oxides and hydrocarbons, and S[O.sub.2] is produced by vehicle and industrial combustion (12,13).
Ground-level ozone is a secondary pollutant and may actually be scavenged from the air by fresh combustion pollutants.
Pollutants emitted directly from vehicles are not the only cause for concern but on warm days, hydrocarbons react with oxides of nitrogen to create a secondary pollutant, the ozone.
2) Secondary air pollutants--formed by the interactions of primary pollutants or secondary pollutant precursors, which are not pollutants in and of themselves.
Ozone ([O.sub.3]): Secondary pollutant formed when other pollutants react in sunlight.
In addition to the primary pollutants, levels of ozone - a secondary pollutant - were also reduced due to the lack of sunshine.
'Nitrogen dioxide is a secondary pollutant and is not produced individually but when nitrogen and oxygen mix at high temperatures.
Meanwhile, a secondary pollutant is not directly emitted as a primary pollutant, but forms when primary pollutants react in the atmosphere.
The same is true of tropospheric ozone, a secondary pollutant that results when volatile organic compounds react with sunlight.
In particular, it is a secondary pollutant, that is, it is not emitted directly by a source but arises due to the chemical reaction produced by the effect of solar radiation on primary pollutants, such as nitrogen oxides or volatile organic compounds.
Ozone ([O.sub.3]) is not emitted as such from a source and is considered a secondary pollutant. So the sequence of reaction shows how gases leading to photochemical smog are formed.