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Emission standard of smoke and dust pollution from factories in Xi city
1. According to the information of official website inquired by the Environmental Protection Bureau, the smoke blackness should not exceed the level of Lingemann.

2. The concentration of flue gas and other pollutants must meet the national Emission Standard for Air Pollutants of Boilers (GWPB3- 1999) and Emission Standard for Smoke and Dust of Industrial Kilns (GB9078- 1996).

3. Under special circumstances such as raw furnace ignition and furnace cleaning, the smoke blackness shall not exceed Lingemann III, and the discharge time shall not exceed 10 minute.