Spatial Analyses of Air Pollutants Concentration around the Warri Refining and Petrochemical Company (WRPC), Delta State, Nigeria

Abstract

This study investigates air pollution from the Warri Refining and Petrochemical Company (WRPC) of Delta
Sate, Nigeria with the intent of determining the variations in pollution levels associated with increasing
distance from the refinery. The following pollutant gases: Carbon monoxide (CO), Volatile organic
compounds (VOC), Hydrogen sulphide (H2S), Nitrogen dioxide (NO2), Sulphur dioxide (SO2) and
Particulate Matter (PM2.5 and PM10), were monitored intermittently with the use of digital hand-held
probes, at sampling points located between 1,500 meters to 16,000 meters from WRPC. Air sampling was
carried out on a weekly basis, for a duration of one (1) year. The average annual concentration of CO, VOC,
H2S, NO2, SO2, PM2.5 and PM10 measured were 0.2543 ppm, 4.4922 mg/m3, 0.0004 ppm, 0.0063 ppm,
0.5263 ppm, 36.3825 μg/m3, 91.7346 μg/m3 respectively. The results of the spatial analyses of air pollutants
show that concentrations of VOC, NO2, PM2.5, and PM10 shared a significant inverse relationship with
distance (p values 0.00 ≤.0.05). The study suggests a minimum of 10,250 meters radial extent of buffers
around WRPC, as a long-term strategy in reducing exposure of residents to air pollution. Short-term
strategies include enforcement of legislation reducing/banning emissions from industries and bush fires, use
of alternative eco-friendly technologies and energy sources, tree planting, revamp of the hydroelectricity
power sector and general sanitization of the environment.