ANALYSIS OF THE OCCURRENCE OF ELEMENTAL POLLUTANTS IN SHALLOW AQUIFERS USING WATER QUALITY INDEX METHOD: THE CASE OF DAR ES SALAAM, TANZANIA. JBLD [Internet]. 2023 May 4 [cited 2025 Sep. 9];24(1):1-16. Available from: http://journals.aru.ac.tz/index.php/JBLD/article/view/343