Considering that Northern Nigeria is a semi-arid region - do take a look at these aspects below:
(1) Well water pollution/quality assessment
(2) Solid waste Management/ Soil Microplastic assessment (There is a high usage of polyethylene in the north which ends up littered in the environment due to open dumping of solid waste and the intensity of the North East trade wind in the area)
(3) Soil microbial assessment in the face of excess use of mineral fertilizer/pesticides
(4) Air pollution verses human health
(5) Spatio-temporal variations on climatic weather condition over years - Rainfall, Harmattan, Radiation
(6) Food quality assessment (mainly vegetables)
(7) Vegetation mapping to ascertain the extent of desert encroachment.
Try navigating through these ideas and you can reach out to me to narrow it down to your area of interest.
Assessing the Impact of Open Burning Practices on Air Quality, Human Health, and Climate Change in Urban and Rural Areas of Northern Nigeria.
Climate change:
Assessment of the impact of climate change on agriculture, water resources, and human health in northern Nigeria.
Development of adaptation strategies to help northern Nigeria communities cope with the impacts of climate change.
Investigation of the potential for renewable energy development and mitigation of greenhouse gas emissions in northern Nigeria.
Toxicology:
Assessment of the impact of heavy metals on soil fertility and crop productivity in northern Nigeria.
Evaluation of the levels of exposure to pesticides and other agricultural chemicals among farmers in northern Nigeria.
Investigation of the role of environmental toxins in the high prevalence of cancer and other chronic diseases in northern Nigeria.
Environmental waste:
Development of sustainable waste management strategies for northern Nigeria.
Assessment of the impact of environmental waste on human health and the environment in northern Nigeria.
Investigation of the use of environmental waste for energy generation and other beneficial purposes in northern Nigeria.
Pollution:
Assessment of the impact of air pollution on human health and the environment in northern Nigeria.
Investigation of the sources and types of water pollution in northern Nigeria.
Development of strategies to reduce pollution from industrial and agricultural activities in northern Nigeria.
Note:
Dear Abubakar Mohammed Maimota,
I have provide some random suggestion for your convenience. You can select/modify/combine those topics as per your need and available instrument/knowledge/interest.
Still depends on your location in northern Nigeria. If your location is in proximity with the numerous mining sites in that region, you can research on the environmental impact of such activities or on the toxicology effect of the activities on artisans involved in them.
Good day, I suggest effects of fertiliser application on the human. As in the north lots of farming is going on and there is wash down of the to the water body which directly or indirectly returns to human. You have checkthe effects focusing on some haematological and Biochemical parameters.