According to the Technical Requirements for On-line Monitoring of Ultra-low Emission and Low Concentration of Thermal Power and Industrial Boilers in Hangzhou, after monitoring, the emission concentration of sulfur dioxide is 6mg/Nm3 minim, with an average of 14mg/Nm3 and a maximum of 20mg/Nm3. The lowest smoke emission concentration is close to 0mg/Nm3, the average is 1.5mg/Nm3, and a maximum of 3mg/Nm3.