沙尘暴是一种自然现象，但是受到了人类活动的影响，现在和交通和工业空气污染一样严重。
Dust storms are a natural phenomenon, but are influenced by human activities and are now just as serious as traffic and industrial air pollution.
这一现象是造成空气污染的原因之一。
这一保险计划承保范围不包括多云、有雾或雾霾的情况，而由于空气污染严重，中国的大城市常常出现这些天气现象。
The insurance plan will not protect against clouds, fog or haze — all frequent occurrences in China's big cities, thanks to high levels of air pollution.
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