mehboob dellangiz, a radio news reporter. the head of the national center for air and climate change, the non-implementation of technical inspection in small cities is one of the reasons for the increase air pollution in big cities. according to mr. golalizadeh, the ease of obtaining a technical mine sheet is available in small cities. connoisseurs of used cars from big cities visit these cities. in case of strict implementation of technical inspection, air pollution in big cities will be reduced by 10 to 15% . the clause of the clean air law deals with the technical inspection of cars in order to control their emissions. they should have a technical subject that has an effective role in reducing the pollution of big cities. contribution of mobile resources to emissions allanda, especially suspended particles less than a micron, varies from 40 to 70 from bese to karanshahr. in the complex, if they do their work as well as the technical examination centers. 10 to 12 percent leads to a reduction in the amount of dust emissions.