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不同地区由于硒源不同,空气中硒存在形态及水平相差很大。一般来说人为活动污染少的大气环境中气态硒比例较高,且多为有机硒,以硒的甲基化物形式存在为主;而人为污染特别是煤烟污染的空气中硒以气溶胶为主,且主要存在于小粒子上,以无机硒为主。空气中硒水平一般在10 ng/m~3以下,多数在0.4～5 ng/m~3,但个别硒工业区空气中硒水平高达20.6 mg/m~3。
Due to the different selenium sources in different regions, there is a big difference in the form and level of selenium in the air. Generally speaking, there is a high proportion of gaseous selenium in anthropogenic pollution-less atmospheric environment, and most of them are organic selenium, mainly in the form of methide of selenium. However, man-made pollution, especially in air contaminated with soot, Lord, and mainly in the small particles, mainly inorganic selenium. The selenium level in the air is generally below 10 ng / m 3, mostly in the range of 0.4-5 ng / m 3, but selenium levels in the air of individual selenium industrial areas are as high as 20.6 mg / m 3.