In contrast to many other environmental problems, noise pollution continues to grow and is accompanied by an increasing number of complaints from people exposed to the noise. The growth in noise pollution is unsustainable because it involves direct, as well as cumulative, adverse health effects. Due to the ignorance of Nigerians on the fact that there exist a close nexus between noise pollution and sustainable city, little or no attention is paid to the control of noise pollution in Nigeria. This study examines the environmental noise levels of Ilorin metropolis, one of the capital cities in Nigeria. Forty- two (42) different locations throughout Ilorin were selected to establish background noise level, peak noise level and dominant noise sources at these locations. The result of this study shows that the major source of noise in Ilorin metropolis can be attributed to traffic noise. Based on the recommendations of Committee on Environmental and Occupational Health (CEOH), World Health Organization (WHO) and Housing and Urban Development (HUD), only 6 locations out of 42 are under normally acceptable situation while the noise levels of other areas are not acceptable. Hence, the present status of noise pollution in Ilorin metropolis poses a severe health risk to the residents. This paper addresses the problems of environmental noise pollution in Ilorin metropolis in particular and Nigerian urban areas in general with the implications of implementing its control measures on the sustainability of the urban areas. Among the effective noise control measures discussed in this paper include: noise mapping, technical, planning, behavioural, and educational solutions. The result of this study is useful as reference and guideline for future regulations on noise limit to be implemented for urban areas in Nigeria.