China's Beijing-Tianjin-Hebei region has made strides in the green transition of its enterprises, industries, energy and transportation during the 14th Five-Year Plan period (2021-2025), effectively improving local air quality, the latest tax data showed on Saturday.

Data released by the State Taxation Administration has revealed that from 2021 to September 2025, enterprises in the region benefited from 1.63 billion yuan (about 230 million U.S. dollars) in environmental protection tax reductions by meeting emissions reduction standards.

In the same period, the environmental tax rate per 10,000 yuan of the region's GDP dropped from 18.60 yuan to 17.60 yuan for these companies -- the tangible results of corporate green transformation.

The region's industrial structure has also seen improvements. Value-added tax invoice data shows that the sales revenues of high-energy-consuming and high-emissions industries accounted for 34.4 percent of the region's overall manufacturing sales in the first three quarters of 2025, which was down from 40.6 percent in 2021.

In the transportation sector, the regional vehicle structure has also become greener. Sales of new energy vehicles accounted for 45.8 percent of all auto sales in the first nine months of 2025 -- a sharp increase from 13 percent in 2021, according to motor vehicle invoice data.

Chen Binkai, vice president of the Central University of Finance and Economics, said that coordinated green development across these fields has established a comprehensive pollution-control system, resulting in valuable experience for cross-regional ecological governance nationwide.