Preliminary hazard assessment of air pollution levels in Nizwa, Rusayl and Sur in Oman

The World Health Organization (WHO) recognises air pollution as a serious public health concern in many developing countries due to the influx of energy-intensive industries with limited planning and exposure mitigation strategies. Due to industrial expansion and release of associated air pollutants in Oman, the US Environmental Protection Agency human health risk assessment (HHRA) model was used to determine the non-carcinogenic hazard associated with exposure to industrial emissions. Across the three industrial cities (Nizwa, Sur and Rusayl), the study found ambient average concentrations (μg/m3) of 1 h carbon monoxide (CO) (606–1974), nitrogen dioxide (NO2) (7.7–43.9) and sulfur dioxide (SO2) (4.8–9.0) and 24 h PM2.5 (7.3–7.8) and PM10 (38.7–51.5) to be significantly lower than both the Ministry of Environment and Climatic Affairs (MECA) and WHO limits. The HHRA analysis showed that exposure to the air pollutants produced low non-carcinogenic adverse health effects, as the hazard quotient (HQ) was found to be