In the Persian Gulf region, conditions are highly favorable for ozone air pollution and the region is a hot spot of photochemical smog. The vast activities in processing oil and gas play a major role in it. It was found that the elevated concentrations of reactive hydrocarbons co-emitted with nitrogen oxides from Hydrocarbon Processing facilities lead to substantial ozone production. South Pars...

Extracts of particulate matter from condensates of city air were tested for their ability to transform rat or hamster cell cultures. Uninfected rat embryo cultures were not transformed, but cultures chronically infected with Rauscher leukemia virus were transformed by benzpyrene or by extracts of city smog. The smog extracts were 600 times more active than pure benzpyrene as transforming agents...

Understanding the formation mechanisms of secondary air pollution is very important for formulation control countermeasures in China. Thus, a large-scale outdoor atmospheric simulation smog chamber was constructed at Chinese Research Academy Environmental Sciences (the CRAES Chamber), which designed simulating photochemical processes under conditions close to real environment. The consisted 56-...

Formaldehyde (HCHO) is one of the important O3 precursors in atmospheric environment, but mechanism for HCHO photochemical reactions not very clear now. In present study, effects relative humidity (RH) and initial VOC/NOx ratio (RCN) on HCHO‒NOx reaction process are studied terms smog chamber experiments. The MCM formaldehyde evaluated based experimental results. measured maximum ozone concentr...

BACKGROUND Starting from early January 2013, northern China was hit by multiple prolonged and severe smog events which were characterized by extremely high-level concentrations of ambient fine particulate matter (PM2.5) with hourly peaks of PM2.5 over 800 µg/m(3). However, the consequences of this severe air pollution are largely unknown. This study investigates the acute effect of the smog epi...

Air pollution measurements are aimed at improving our understanding of the chemical properties of the atmosphere, addressing mainly three issues with very different space and time scales: • Measurement of critical or peak values of air pollutant in densely urbanized/industrialized sites. • Long term observation and trend analysis on air quality. • Evaluation of photochemical pollution (smog) ep...