In this study, Seoul Terminal (Gangnam Express Bus Terminal, South Terminal, East Seoul Terminal) from a one-way mileage 200 ㎞ or more long-distance express bus and coach routes to target indoor air quality (CO₂, PM10) to investigate the interior air quality levels investigated. If the former route of PM10 in the study indoor air quality guidelines, LEVEL1, 2 (150 ㎍/㎥, 200 ㎍/㎥) although has been surveyed. PM10 concentrations of Bus 14.9 ㎍/㎥ the intercity bus (12.1 ㎍/㎥) was higher than the survey. Summer is the season of high-speed bus, CO₂, estimated at 10 before measurement guidelines from the line Ministry Level 1 (2,000 ppm) and Level 2 (3,000 ppm) meet, whereas the measurement results from Seoul to Daegu Summer off season (2,589 ppm), Seoul to Busan (2,332 ppm) from the Ministry of Environment guidelines between Level 1 (2,000ppm) were investigated to exceed. Coach Bus in Seoul and captures the summer season (2,793 ppm), Seoul to Yangyang (3,896 ppm), Seoul and Imsil (3,739 ppm) and the Ministry of Environment guidelines on Route 3 Level 1 (2,000 ppm) and Level 2 (3,000 ppm) was surveyed in excess. Based on these results, public transport operators or manufacturers of public transport vehicles properly maintained to the Public Transportation System air quality by providing guidelines for managing the use of public transport and protect people"s health and help provide a comfortable service This is expected to be able to.