6.1 Information on lichen species and their frequencies in Chiang Mai city will be obtained and compared with lichen data from the past. Absent to present of some indicator species will be known which may help to identify a good indicator species.
6.2 The study of lichens in urban and suburban in Chiang Mai city will provide basic information on air quality of the areas, and the effects from air pollution and provide air quality mapping by using lichens as indicators will be defined
6.3 Concentration of nitrogen dioxide in the study areas will be determined and its relationship to lichen diversity will be classified
6.4 The information might be applied in the study of the environmental effects to distribution of organisms