Abstract
Emissions emanating from commercial facilities in high dense area are subject of concern as more people are being hospitalised or suffering from long term exposure to poor air quality. This has necessitated assessment of air quality and other hazardous emissions in some commercial facilities. This paper presents the air quality index, formaldehyde and environmental emissions emanating from four service stations using Lagos State metropolis as a case study. Four different filling stations are strategically selected from dense localities and monitored for about 8hrs per day for 30 days each. The level of air qualities are assessed respectively for these locations. The data is time-averaged over the period of the data acquisition, and the results are presented. The air quality index for all the service stations are below recommended threshold by the World Health Organization (WHO) guidelines. The CO, CO2 and HCHO emissions have similar pattern with respect to all locations monitored. Further analyses of emissions from different stations reveal that there is no significant difference in the emissions patterns at 95% confidence as Pvalue is greater than 0.05 (i.e. Pvalue >0.05) for AQI, CO, HCHO and TVOC emissions.

Key words: Emission, Air quality index, Carbon monoxide, Carbon IV oxide, Service station