INVESTIGATION INTO THE AIR QUALITY (PARTICULATE MATTER) IN FREETOWN, SIERRA LEONEHANNAH KARGBO AND RONNIE A. D. FRAZER-WILLIAMSAbstract A study to investigate the particulate matter concentration (PM2.5 and PM10) for both indoor and outdoor air in specified locations in the city of Freetown was conducted. The concentration of PM10 and PM2.5 were measured using a hinaway CW-HAT200S Handheld Air Tester. Indoor concentrations ranged from 8 to 140.7 and 10.5 to 308.1 μg/m3 for PM2.5 and PM10 respectively, whilst outdoor concentrations ranged from 8.0 to 289.3 and 15.7 to 501.7 μg/m3 for PM2.5 and PM10 respectively. Result indicate that the west end of the city have a better air quality compared to the east and central part of the city. There is a positive correlation between indoor and outdoor air quality. In general, the air quality in the city was considered to be relatively poor and in assessment of mortal exposure, large percentage of residential areas in the city are open to high concentration of PM which is considered as a public health risk.
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