Horizontal Measurements of SO2, NO2 and SPM in Indoor Air and relationship to Outdoor concentration

Measurements of SO2, NO2, and Suspended Particulate Matter (SPM) of indoor air andcorrelation with outdoor air have been determined in an office of multistory mechanicallyventilated building. The objective of the study was to evaluate the diversity of SO2, NO2and SPM inside building and penetration of pollutants, mostly found outside, from outsideto inside in an airtight building. Ground floor of the building was selected for study.Horizontal measurement of SO2, NO2 and SPM was done inside the building at foursampling stations. Simultaneously outdoor measurement too was carried out at twosampling stations to analyze the ratio of indoor to outdoor pollution. The results ofmeasurement study illustrate the penetration of outside pollutants to inside the building.Activities of building users, occupants and visitors, play vital role manipulating theconcentration of pollutants inside. No predominant sources of these pollutants were foundinside.