China's largest oil company.

China's largest offshore oil and gas producer.

China's largest oil and gas producer.

World's largest oil refiner.

Environmental engineering for mining and metallurgy. Wastewater treatment, tailings management, and contaminated site remediation.

Environmental monitoring and smart environmental solutions. Air quality monitoring, water quality monitoring, and environmental data platforms.

Air pollution control equipment leader. Electrostatic precipitators, desulfurization, and denitrification systems. China's largest ESP maker.

Electrostatic precipitator and bag filter manufacturer. Air pollution control equipment for power plants and industrial facilities.

Environmental engineering and equipment. Air pollution control systems, dust removal, and industrial wastewater treatment.

Environmental protection subsidiary of SPIC. Flue gas treatment, wastewater treatment, and solid waste management for power plants.