This study aimed to provide a perspective on landfill gas emissions, environmental health effects of the urban waste management system in Port Harcourt, Nigeria, and the city’s potential for power generation using landfill waste. Real time air quality measurement techniques, field observations and LFG modelling were applied to Port Harcourt city landfills. These disposal areas receive, per year, up to one million tons of domestic and hazardous waste, and produce around 68 million m3/year of LFG (biogas). Additionally, if properly harnessed, this waste may generate more than 11 million KWh /year of electricity. It was also discovered that SO2 emissions from the landfill sites were above the USEPA limits (75ppb), while other regulated gases were within acceptable limits.  Particulate matter was mostly above acceptable limits and tended to increase up to 250m radius from landfill sites. Thus, this excess poses serious respiratory and cardiovascular health dangers to the public, especially among inhabitants and workers who operate within 250 metres of the landfills. With this in mind, the following are recommended:  a) the outright closure of two of the landfills in the city; b) acquisition of all property within 300 metres radius from the centre of the landfills which is within the “planning area” of each landfill and adequately compensating for all property so acquired; and c) construction of four properly engineered landfills with full capacity to capture leachate and convert LFG into power, through public-private partnerships.