Abstract
Ozone in the troposphere plays an important role in the Earth's atmosphere. Tropospheric ozone has increased during the past century, controlling oxidizing capacity of the atmosphere, having detrimental effects on human health, and acting as one of greenhouse gases. The factors controlling distributions and variations of tropospheric ozone are rather complicated due to a number of chemical reactions and substantial lifetime in air, thus limiting comprehensive understanding of its evolution on the global scale. In addition to nitrogen oxides, volatile organic compounds greatly contribute to chemistry and budget of tropospheric ozone. In this paper, two topics are highlighted with respect to interaction of natural sources with tropospheric ozone: analysis of the impacts of boreal forest fires in Siberia, and challenges toward field measurements of volatile organic compounds in air and seawater.
