Carbon dioxide (CO2
) is a salient constituent of the atmosphere, averaging about 0.036% or 360 ppm by volume. It is also a normal end-product of human and animal metabolism. Unfortunately, carbon dioxide is one of the most frequently under estimated and inappropriately overlooked component of all toxic gases. A minor reference to CO2
as a toxic gas is a surprise to many health and safety professionals. The toxicity of CO2
for breathing has been well defined for high concentrations but it remains unknown what level will compromise human health when individuals are perpetually exposed for a lifetime. This research investigated the level of carbon dioxide in fast food outlets in Obior Akpor Local Government Area (LGA), Rivers State, Nigeria as a case study. To achieve this objective, carbon dioxide readings were taken in fast food outlets in the LGA. The fast food outlets were selected using the systematic random sampling technique. Analysis of Variance (ANOVA) and the Chi-square test was used to test the hypotheses. The results and research findings showed that there is a difference in the level of carbon dioxide emitted across the fast food outlets as such, people who patronize these fast food outlets as well as their workers are susceptible to a certain level carbon dioxide poisoning without them being aware. Recommendations involving the use of potted house plants were made in other to alleviate or ameliorate the effect of increased carbon dioxides on human health.