unorganized emissions are regarded as exceeding the standard. The length of the outlet section of the exhaust pipe should be at least 4.5 times the diameter (or equivalent diameter) of the straight pipe section. The outlet of the exhaust pipe should be oriented away from vulnerable buildings. The specific regulations on the height and position of the fume exhaust pipe shall be formulated by the provincial environmental protection department, as long as the unorganized emission is reported, it will be regarded as exceeding the standard.