“…The exposure to pollutants from landfill sites can be acute or chronic (Giusti, 2009). The process of assessing the exposure to pollutants from landfill sites involves determination of frequency, duration of previous, present and future exposure, magnitude, and identification of pathway for potential exposure (Spinazzè et al, 2017). Guo et al (2017) evaluated the non-cancer risks from inhalation of formaldehyde (CH 2 O), H 2 S, and SO 2 using hazard quotient (HQ) shown in equation (12) while cancer risk (CR) as a result of inhalation of CH 2 O was computed as presented in equation (13).…”