The paper would often stay in the tree for weeks until a heavy snow or rain washed it off.

除非下大雪或大雨把纸冲掉，纸会一直呆在树上。

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"We can't just expect wind, snow or rain to wipe out the pollution when it gets bad," Ma added.

马还说：“我们不能一污染了就指望刮风下雪或者下雨来清洗空气。”

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"We cant just expect wind, snow or rain to wipe out the pollution when it gets bad," Ma added.

马还说：“我们不能一污染了就希望刮风下雪或者下雨来清洗空气。”

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Then, when snow or rain wash them onto an ice floe, they darken its surface and thus cause it to melt faster.

FORBES: Soot and CO2 In The Arctic

In China, they use artillery shells, rockets and airplanes to spray existing cloud systems with silver iodide, a compound that triggers moisture in the clouds to form ice crystals, which then fall to earth as snow or rain.

WSJ: Blizzard Renews Storm Over China Making Snow

Light snow or freezing rain was falling in northern areas of the state early Friday afternoon, with light rain reported elsewhere.

WSJ: A state-by-state look at the Northeast blizzard