ASSESSMENT OF NITROGEN OXIDES (NO2) EMISSION COMPLIANCE LEVEL OF AUTOMOBILES IN LAGOS STATE -NIGERIA

Abstract

This study focused on the assessment of NO2 emission compliance of automobile in Lagos State, Nigeria. The automobile emission data were generated from sampling 312 different types of vehicles using Testo 350XL emission sensor. The finding on Analysis of Variance (ANOVA) on emission concentration differentials of automobiles shows that NO2 emission concentration differs significantly by automobiles at F85.468Pvalue of 0.000. The result of emission levels based on automobiles categorization shows that Trucks, Mini buses, Tricycles and Motor cycles have higher emission concentrations of NO2 pollutant of 980ppm, 165.3ppm, 150.5ppm and 220.29ppm respectively compared to the set standards of 753.5ppm, 5.3ppm, 5.25ppm and 5.25ppm. It was also found that the emission concentration of NO2 from petrol automobiles with 796ppm was higher than the diesel engines with 143.8ppm. The study recommended a periodic stop and checks emission analysis on Trucks, Mini buses and Tricycles which mostly violated the emission regulatory standards. The study recommended a periodic stop and checks emission analysis on Trucks, Mini buses and Tricycles which frequently violate the emission regulatory standards, as well as infuse NO2 emission check on vehicular road worthiness requirements.