Pompomari is a district in Damaturu metropolis in Yobe State, northeast Nigeria, and it has been identified by some researchers to have groundwater pollution problem. In view of this problem, this study investigated the groundwater pollution in the area using geophysical and hydro-chemical methods. The findings of this study showed that the area is composed of five geo-electrical layers such as topsoil, clay, sandy clay, sand and clay. The fourth layer constitute the aquifer in the study area. The Electrical Resistivity Tomography (ERT) survey delineated the contaminant plumes in the study area as low resistivity materials in the subsurface. The contaminated zones were identified with resistivity values ranging from 2 -20 Ωm. The results of the hydrochemical analysis of the groundwater samples in the study area confirm that the groundwater is polluted and it validated the ERT survey results. Based on the findings of this study, we recommend that a high capacity drainage system should be constructed in Pompomari area of Damaturu to protect the area from flooding and groundwater pollution. Shallow boreholes in the study area should be closed and new borehole should be drilled to a depth of 100 m and above for quality groundwater abstraction from the fourth geologic layer which is a confined aquifer. The pollution index values for Cadmium, Lead, Iron, Arsenic, and Chromium showed that the groundwater in the study area is polluted.

Heatwaves are significant natural disaster that is caused primarily by extreme temperatures. The extreme heat events associated with heatwaves often cause severe health complications and deaths. In view of the environmental hazards associated with heatwaves, this study investigated the impact of heatwaves in Yobe State, northeast Nigeria. Temperature and humidity data of thirty years (1991-2020) for the hot season (March-June), were obtained from the Nigerian Meteorological Agency (NiMet) Abuja.  Time series analysis and basic statistical tools were used to analysis the data which was used to evaluate the trend of heatwaves and their impact in the study area. The results of the study showed that 2010 was extremely hot with an average maximum temperature anomaly of 2.18, while 2013 and 2015 have an average maximum temperature anomaly of 1.93 respectively, and were very hot. The trend in the average maximum temperature anomaly of the study area showed a continuous increase in extreme heat for about a decade (2009-2020). The positive temperature trend and the average maximum temperature anomaly showed that the intensity of heatwaves in the study area will increase in the future as a result of global warming caused by the continuous emission of anthropogenic greenhouse gases. The results also showed that the heatwaves were exacerbated by the drought which occurred between 2010 and 2014.  The annual heat index which range from 29.4oC - 34oC in the study area showed that the heatwaves have impacted both human and animals negatively in the area.