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Invisible Gases Form Most Organic Haze in Urban, Rural Areas: Study
Till now, the scientists and health professionals had believed that sources that spew soot and other tiny particles directly into the air were the primary culprit in the formation of organic haze.
But the new study by researchers Qi Zhang and Jose-Luis Jimenez show aerosols formed chemically in the air account for about two-thirds of the total organic haze in urban areas and more than 90 percent of organic haze in rural areas.
Zhang and Jimenez compared concentrations of directly emitted, or primary, aerosols with chemically formed, or secondary aerosols. They surveyed urban areas, areas downwind of urban areas and rural areas from 37 sites in 11 countries.
According to Jimenez, there exists an extended source or continuous formation for the pollution, and both he and Zhang believe that this extended source of particle pollution is reactive, and can be identified as colourless gases called Volatile Organic Compounds (VOCs), the same gases that form smog.
"We think the gases react over a few days as the air travels downwind into more rural regions, producing more organic haze," Jimenez said.
Reactive gases are a diverse group of chemical compounds that include VOCs, surface ozone, nitrogen compounds and sulfur dioxide. All play a major role in the chemistry of the atmosphere and as such are heavily involved in inter-relations between atmospheric chemistry and climate.
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