移动源已成大气污染排放的重要来源

Group 1 - The core point of the report indicates that mobile source pollution has become a significant contributor to air pollution in China, with total emissions reaching 18.582 million tons in 2024 [1] - Among mobile sources, motor vehicles accounted for 12.856 million tons of pollutants, with cars being the primary contributors, responsible for over 90% of emissions of carbon monoxide, hydrocarbons, nitrogen oxides, and particulate matter [1] - Diesel vehicles are particularly concerning, with nitrogen oxides and particulate matter emissions constituting 87.1% and over 99% of total car emissions, respectively [1] Group 2 - Non-road mobile sources, including construction machinery, agricultural machinery, ships, and railway diesel locomotives, contributed 5.726 million tons of emissions in 2024 [2] - The transportation structure in China is predominantly road-based, handling approximately 70% of passenger and freight transport, highlighting the need for optimization towards electrified railways and clean shipping [2] - The Ministry of Ecology and Environment plans to enhance efforts in pollution management, focusing on diesel truck pollution control and improving mobile source environmental management to effectively reduce emissions and improve air quality [2]