1·Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants.
二氧化硫是酸雨的主要成因之一，它是一种特别严重的污染物，因为它会降低呼吸系统处理其他污染物的能力。
2·The level of sulfur dioxide gas above Venus's clouds shows large and very frequent fluctuations.
金星云层上方的二氧化硫气体水平显示出巨大且非常频繁的波动。
3·New coal-burning plants usually comply with the law by installing expensive equipment to filter sulfur dioxide from their emissions.
新的燃煤电厂通常安装昂贵的设备来过滤排放的二氧化硫以遵守法律。
4·Other issues, Trenberth says, are the cost and the location: Should sulfur dioxide seeding be global, or more localized to target specific parts of the planet?
其他问题，还包括成本和定位：是应该进行全球性撒播二氧化硫，还是定位后投射到特定目标区域？
5·They recommend revised limits for the concentration of selected air pollutants: particulate matter (PM), ozone (O3), nitrogen dioxide (NO2) and sulfur dioxide (SO2), applicable across all WHO regions.
它们为下述选定的空气污染物的浓度限值提出了修订：可吸入颗粒物(PM)、臭氧(o3)、二氧化氮(NO2)和二氧化硫(SO2)，适用于世卫组织所有区域。