The rather stagnant flows in turn sharpen the roof-level vertical velocity gradient and deter the entrainment penetrating down to the ground level, leading to a substantial pollutant accumulation.
In addition, empirically determined attenuation factors for single- and bipollutant models show that the potential for attenuation in the estimated effects can be quite substantial for many pollutants and exposure error types, in particular for local pollutants (with the exception of δpopulation for CO).
Besides, the domestic sewage effluents from villages nearby also contributed a substantial amount of pollutants.
Background: Residential natural gas cooking burners (NGCBs) can emit substantial quantities of pollutants, and they are typically used without venting range hoods.
Conclusions: Under a classical exposure-error framework, attenuation may be substantial for local pollutants as a result of δspatial and δtotal with true coefficients reduced by a factor typically < 0.6 (results varied for δpopulation and regional pollutants).
The microinventory completed for segment 4593 provides information that is consistent with the above, confirming the presence of few major local sources that were not accounted for in the national inventories; only one gasoline station was located in the area, and no major commercial establishments that release substantial amounts of pollutants.
These predictions suggest that almost perfect (95% uptake) implementation of source control measures will not deliver substantial improvements in pollutant emissions.
In addition to these energy aspects, the transportation sector is responsible for a substantial part of pollutant emissions in the atmosphere, which are directly and indirectly impacting different receptors such as people, material, agriculture, climate and ecosystems [92].
It sets the stage for further such settlements that, over time, could lead to substantial reductions in two pollutants that are blown eastward from power plants in the border states and the Midwest -- sulfur dioxide, which causes acid rain, and nitrogen oxides, which contribute to smog.
The shipping industry is a substantial emitter of air pollutants such as nitrogen oxides (NOx), sulphur oxides (SOx), carbon monoxide (CO) and carbon dioxide (CO2), because the vast majority (95%) of the world's shipping fleet runs with engines powered by Intermediate Fuel Oil (IFO) for economic reasons (Cullinane and Bergqvist 2014).
