Christmas stockings hung by a fireplace complete with crackling logs make for a festive image, but the rising popularity of wood-burning is being linked to a seasonal spike in air pollution.
壁炉旁挂着圣诞袜，噼里啪啦地燃烧着原木，这是一幅充满节日气氛的画面，但燃木的日益普及却与空气污染的季节性飙升有关。
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