Standards for Air Pollutant Emission from Stationary Pollution Sources Article 9
For those pollutants from new pollution source emissions that have conversion constants listed in this table, emissions pipe height shall be calculated in accordance with the respective calculation methods of Article 7 and Article 8, and the higher emissions pipe height shall be the emissions pipe height.When the competent authority handles cases involving existing pollution sources, it may order the said existing pollution source to improve emissions concentration or shall apply regulations of the first paragraph to change the emissions pipe height.