The purpose of this research is to study about the problem of air pollution and smog that harmful to people in Chiang mai. To find the solution and prevent them. We use the questionnaire as an instrument. 25 students from 11 classrooms in Mathayom 4 Wattanothaipayap schools was taken to the sample group. A group of student have to show their opinion about air pollution and also find solution as the result.