Airborne Carcinogenic Trace Elements Distribution Associated with Long Term Exposure in Makkah Population

More than 4 million international pilgrims visit Makkah each year during the Hajj and Umrah seasons. Since trace elements are natural ingredients that endure general biogeochemical cycling, conversion functions between environmental loadings, mass levels, and exposed receptors.This study aimed to evaluate the distribution of carcinogenic trace element levels related to long term exposure.Particulate Matter (PM10) sampling was conducted at six locations (Al-Haram, Arafat, Muzdalifah, Aziziyah, Al Nuzhah, and Al Awali). On-site measurement parameters included ambient temperature, wind speed, and direction over 37 weeks. Samples were investigated for Cd, Cr, As, Be, and Ni levels with inductive coupled plasma mass spectrometry. Quality assurance measures were achieved separately by analyzing a control sample to certify reliability, reproducibility, and linearity for each analysis.Average particulate matter concentration for a one-year period presented significant variability, which exceeded the WHO guidelines for average exposure (25.0 µgm-3). PM10 average concentrations during round-1 (Spring), round-2 (Summer), round-3 (Autumn) and round-4 (Winter) were 120.1 ± 52.2 µgm-3, 223.4 ± 30.4 µgm-3, 77.6 ± 36.72, and 89 ± 62.7 µgm-3, respectively. The concentrations of Cd, Cr, As, Be, and Ni were found to be 0.098, 0.008, 0.26, 0.03, and 0.012 µgm-3, respectively.PM10 concentration was highly correlated (p-value <0.005) with Cd, Cr, As, Be, and Ni; thereby indicating the influence of manufacturing discharges and pollutants transported over long-distances. Higher ambient air temperatures may cause atmospheric instability in low air dispersion around Makkah. This highlights the importance of continuous air monitoring and calculation of dose exposure levels of both PM10 and trace elements.