Journal of Geography & Natural Disasters
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Measurement and analyses of concentrations of methane (CH4) and nitrogen-dioxide (NO2) gases at a quarry site.

Orji Prince

Measurement and analyses of the concentrations of NO2 and CH4 gases in ambient air at Setraco quarry site, Abia State, Nigeria (latitude 05⁰33N and 06⁰03N, and longitude 10⁰E and 07⁰29E) were carried out in this study. The gases were measured using two automatic air samplers namely EM-4 Type Multi-P detector and AIKE EM-201 Gas meter. The measurements were made at three sampling points; the engine house, petrol station and crushing site for 12 weeks (7th August – 6th November, 2017) at one (1) hour interval per session for three sessions (morning, afternoon and evening) in a day. It was observed that at petrol station, the mean concentration of methane was highest with a value of 3.14±0.8% which is much higher than World Health Organization (WHO) recommendation of 0.1% exposure limit for 8hours working time. The lowest mean concentration at the petrol station was 0.39±0.08% which is still quite high and above deleterious level or the WHO acceptable limit. At the Engine House, the highest mean concentration of NO2 measured was 375±4.0ppm, which is higher than World Health Organization (WHO) and Federal Environmental Protection Agency (FEPA) acceptable limit of 4.89ppm for weekly mean concentration. The Air quality index (AQI) calculation for the NO2 concentration of 375±4.0ppm yielded a health-threatening value of 153 especially for people with heart and breathing problem. These results imply that NO2 is emitted more at the Engine house, less at the Petrol station and much less at the Crushing site while CH4 is emitted more at the Petrol station than Engine house and Crushing site.