Abstract
A survey of atmospheric aerosols in a suburban area near Tokyo, Japanwas conducted using an Andersen sampler. Significant amounts of Na+and Cl- collected were considered to be derived from sea salt. The difference between the Na+/Cl-ratio in the area and that in sea salt indicated a considerable loss of Cl-. This is assumed to be caused by the formation of NaNO3, which is one of the main nitrate species present. Most of the sulfate in the sample was found to be (NH4)2SO4 in the form of fine particles, which is different from the sulfate derived from sea salt and soil. The size distributions of K and Mg are also discussed in relation to particular sources.
Highlights
Air pollutants emitted into the atmosphere from various sources can be classified as either gaseous or particulate matter (PM)
The difference between the Na+/Cl−ratio in the area and that in sea salt indicated a considerable loss of Cl−
The distribution is bimodal; the fine particles peak at approximately 1 μm and the coarse particles peak at approximately 4 μm
Summary
Air pollutants emitted into the atmosphere from various sources can be classified as either gaseous or particulate matter (PM). These types of pollutants are closely related to each other through gas-to-particle conversion, called condensation, and particle-to-gas conversion, called evaporation [1]. A particle that is initially emitted as gaseous matter and converted to PM through ambient chemical and physical processes is described as a secondary particle [3]. Size distribution and chemical composition analysis detail basic characteristics of atmospheric PM These characteristics are closely related to the effects PM has on human health [6,7,8]. The sources of the anion and cation species with respect to their contribution to ambient aerosol are discussed
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