In 2022, Tangshan was seriously polluted and environmentally friendly. By the end of June, 2022, 5438+065438+1October 17 According to relevant public information, air pollution control work was deployed in Tangshan area, and environmental protection control of key industries such as steel, coking, cement, sand and gravel was upgraded again, which put forward clear requirements for desulfurization, denitrification, dust removal and carbon monoxide emission reduction of enterprises. Before the end of 1 1, the concentration of nitrogen oxides in ironmaking, steel rolling and lime processes in iron and steel enterprises should be controlled below 50mg/Nm3, and hydrogen-oxygen flame cutting technology should be adopted in steelmaking. The concentration of sulfur dioxide in coking enterprises is controlled below 15mg/Nm3, and the sand and gravel industry has achieved full dust suppression coverage. Note from Cai Xiao: In February 2022 1- 168, Tangshan ranked in the bottom ten, and the current Ultra-low Emission Standard for Pollutants in Iron and Steel Industry in Hebei Province requires that the concentration of nitrogen oxides in ironmaking, steel rolling and lime processes should not be higher than 150mg/m3.