The present study deals with the monitoring of lichens in a sub-urban area, Harwan, free from any direct polluting source was done with the aim that how air quality of area can be assessed using lichens as indicator and establishing the fact that how cleaner environment supports better diversity and density of lichens. The variety and variability data on Lichen species was collected and correlated with the air analysis data that was obtained using High volume Air Sampler. Analysis of air quality in the air was based on determining fraction of SPM (Suspended Particulate Matter), RSPM (Respirable Suspended Particulate Matter), NRSPM (Non-Respirable Suspended Particulate Matter), SO2 (Sulphur dioxide) and NO2 (Nitrogen dioxide) on seasonal basis i.e spring, summer and winter season on six (6) hourly basis. Quadrats of 25cm x 25 cm size, three on each tree, were laid from base to chest height for recording the data on frequency, density and abundance of lichens growing on the selected trees. Chlorophyll analysis, pH of host trees and water holding capacity was determined The study revealed the occurrence of 14 species of lichens belonging to 11 genera and 5 families. The air quality parameters were generally found within permissible limits with slight variation in different seasons. The data on the quantitative parameters i.e frequency, density and abundance of lichen species showed good values. Analysis of data further revealed that chlorophyll content of species is quite good in the area. The present communication thus serves as baseline record regarding the level of various pollutants including particulate matter and the number of lichen species for conducting biomonitoring studies in future.