Gaseous Nitrogen Compound Pollutants from Urban and Natural Sources

Gaseous pollutants in Beijing: variability, sources, and impacts

Atmospheric Chemistry and Physics Discussions This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Abstract Gaseous pollutants, NO y /NO x , SO 2 , CO, and O 3 , were measured at an urban site The concentrations of the pollutants show " saw-toothed " patterns, which are attribut...

Adsorption of Gaseous Pollutants

Reducing Pollutants from Mobile Sources

Results of experimental investigations of using a coil-shaped injector for reducing NOx emissions from a diesel engine are presented. The study involved the effects of coil length and its mixing effectiveness and the development of the injector system for after treatment of diesel exhausts. Results indicate that the coil-shaped injector system with the ratios of length, pitch and wire diameter ...

Sources and transport of nitrogen in arid urban watersheds.

Urban watersheds are often sources of nitrogen (N) to downstream systems, contributing to poor water quality. However, it is unknown which components (e.g., land cover and stormwater infrastructure type) of urban watersheds contribute to N export and which may be sites of retention. In this study we investigated which watershed characteristics control N sourcing, biogeochemical processing of ni...

Distinguishing between Nitrification and Denitrification as Sources of Gaseous Nitrogen Production in Soil.

The source of N(2)O produced in soil is often uncertain because denitrification and nitrification can occur simultaneously in the same soil aggregate. A technique which exploits the differential sensitivity of these processes to C(2)H(2) inhibition is proposed for distinguishing among gaseous N losses from soils. Denitrification N(2)O was estimated from 24-h laboratory incubations in which nitr...