冬季当空气质量指数超过一百五十的那几天，我们禁止居民燃烧木材。
On the individual level ... on certain days in winter when the air-quality index is over 150, we prohibit residential wood-burning.
冬季当空气质量指数超过一百五十的那几天，我们禁止居民燃烧木材。
On the individual level … on certain days in winter when the air-quality index is over 150, we prohibit residential wood-burning.
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