Hong Kong has been suffering serious ambient air pollution for about the past two decades. While there have been some improvements (e.g., roadside respirable suspended particulates (RSP, also called PM10) are down somewhat (0.075 mu g/m~3 in 2006 compared to 0.091 mu g/m~3 in 1999. Other pollutants such as ozone and sulphur dioxide (SO2) have gotten worse e.g., Ozone in urban areas average .023 mu g/m~3 in 1999 and rose to 0.30 by 2006, while SO2 in urban areas rose from 0.015 mu g/m~3 in 1999 to 0.023 mu g/m~3 in 2006).
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机译：在过去的二十年中，香港一直遭受严重的环境空气污染。虽然已经有一些改进（例如，路边可吸入的悬浮颗粒（RSP，也称为PM10）稍微（2006年0.075 mu g / m〜3，而1999年的0.091 mu g / m〜3。其他污染物如臭氧二氧化硫（SO2）硫磺（SO2）较差，臭氧在城市地区平均，1999年平均为0.023亩，升至2006年上涨至0.30，而1999年城市地区的SO2上涨至0.015亩2006年0.023μg/ m〜3）。
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