Environmental monitoring: Air pollution control Air quality monitoring and improvement Industrial waste gas purification Atmospheric environment monitoring pollution control Carbon emission monitoring Emission reduction technology Ecosystem monitoring water quality monitoring Water quality monitoring methods Soil remediation Pollutant analysis technology Species diversity monitoring Noise monitoring control technology environmental monitoring Big data technology Ecological environment: Ecological environment restoration and protection sustainable development Environmental pollution control and engineering environmental monitoring Environmental remediation Wetlands and aquatic ecosystems Hydrology and Water Resources Engineering Water and soil conservation and desertification control Energy saving, environmental protection and low-carbon technology Climate change Global warming Waste treatment and recycling Noise treatment works air pollution