In the event that under specific circumstances it is absolutely necessary to burn bitumen, asphalt felt, rubber, plastics, leather, or other materials which may produce toxic or other harmful dusts, or gases with offensive odor at population centers,

• 除特殊情况确需在人口集中地区焚烧沥青，油毡、橡胶、塑料、皮革以及其他产生有毒有害烟尘和恶臭气体的物质的，