Secondary pollutants such as [O.sub.3] and S[O.sub.4] had higher concentrations in the warm than in the cold season, whereas primary pollutant
such as CO had higher concentrations in the cold than in the warm season.
Nitrogen dioxide is a primary pollutant
and strong respiratory irritant, with the main outdoor sources including motor vehicles and fossil-fuel power plants, whereas the most important indoor sources are gas heaters, stoves and tobacco smoke (31,32).
In , the dispersion of primary pollutant
was studied in a two-dimensional air pollution model with mesoscale wind.
The primary pollutant
in both cities is particulate matter, largely the result of fossil fuel combustion.
As part of its pro-Green policies, Norway's leftwing Liberal Party demanded the tax be incorporated into the 2016 budget as a means of dampening demand for air travel which is seen a primary pollutant
. The tax is expected to raise NOK2 billion (USD226.8 million) for the fiscus on an annualized basis.
[PM.sub.2.5] as the Most Important Primary Pollutant
. According to the Technical Regulation on Ambient Air Quality Index (on trial), except when the air quality as a whole is Grade I, the criterion pollutant with the highest individual air quality index shall be listed as the primary pollutant
on the air quality report.
The law closes a major loophole in existing laws which would otherwise allow increased and unlimited emissions of carbon dioxide--the primary pollutant
that causes global warming--from coal gasification plants.
The primary pollutant
groups are "nutrients" (compounds of nitrogen and phosphorus that come from sewage and fertilizer), and chemical pollution (insecticides, heavy metals and other toxic chemicals in stormwater, wastewater and engine discharges).
According to the Environmental Protection Agency, a primary pollutant
is an air pollutant that is emitted directly from a source, either a stationary source or a primary source .
The different duration of the atmospheric mixing phase over a year has an important consequence for atmospheric primary pollutant
Intersite correlations (median r [less than or equal to] 0.08) were low for the primary pollutant
S[O.sub.2] and other metals (Cu, Zn, Pb) largely originating from local industrial point sources (Table 1).
One network was identified for genes affected by the primary pollutant
mixture, which included proteins relevant to cancer biology.