There are aspects of the atmosphere in the Maas river valley smoke, smoke more than Nora, London smog, soot and sulfur dioxide are all about.

• 在大气方面就有马斯河谷烟雾事件、多诺拉烟雾事件、伦敦烟雾事件，都跟二氧化硫和烟尘有关。