Fig. 1From: Relationships between perceived health status and ambient air quality parameters in healthy Japanese: a panel studyStudy area and the location of monitoring stations. Left panel shows map of Japan. Niigata and Kumamoto prefecture were shown in the right-upper panel and right-lower panel, respectively. Monitoring stations were presented as red circles. The original data of the map was obtained from http://d-maps.com/index.php?lang=enBack to article page