In 2020, China announced that it would aim to achieve peak CO2 emissions before 2030 and carbon neutrality before 2060. Since 80% of China's air pollutants come from fossil energy, energy conservation is the most efficient measure to reduce CO2 emission. In the more than two years since the publication of GB 17820—2018 Natural Gas, group companies of PetroChina have systematically conducted laboratory and/or industrial plant tests on removing organic sulfur from natural gas, to meet the total sulfur content limit target of below 20 mg/m3 for Class 1 gas. A relatively wide ranging and complete set of data were collected from these tests. These data indicate that that the total sulfur content limit for Class 1 gas (below 20 mg/m3) does not suit China's national environment. A preliminary technical and economic analysis of 3 operating industrial facilities shows that energy consumption to achieve the Class 1 gas target is extremely high. This is in contradiction to the technology development trend of other high energy consumption industries in their effort to achieve the ‘carbon peak emission’ and ‘carbon neutrality’ goals. In conclusion, this paper recommends to immediately revise GB 17820—2018 Natural Gas, and set the total sulfur content limit of Class 1 gas as 50 mg/m3, and that of Class 2 gas as 150 mg/m3.