The conceptual diagram of anthropogenic monoterpenes causing air pollution in urban regions and the chemical difference in forest regions. (IMAGE)
Caption
In urban regions, high monoterpenes emissions are accompanied by high NOx emissions. With the interactions of NOx, the monoterpene derived RO2 (an intermediate of monoterpene oxidation) can produce large amounts of O3 as well as secondary organic aerosols (SOA). While in forest regions, although monoterpene emissions are large, with less NOx interactions, the O3 production is limited and thus only produce SOA.
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