Alnagran, Hamed, Howaida Mansour, Saleh Alashrah, Nursakinah Suardi, and Azhar Abdul Rahman. 2023. “Evaluation of Toxic Heavy Metals and Health Risk in Airborne Particulate Matter at Qassim Region, Saudi Arabia”. Trends in Sciences 20 (11). Nakhon Si Thammarat, Thailand:6978. https://doi.org/10.48048/tis.2023.6978.