The Seasonal Variation of the Concentrations of Ozone, Sulfur Dioxide, and Nitrogen Oxides in Two Nigerian Cities |
| |
Authors: | A M O Abdul Raheem F A Adekola I O Obioh |
| |
Institution: | (1) Department of Chemistry, University of Ilorin, Ilorin, Nigeria;(2) Centre for Energy Research and Development, Obafemi Awolowo University, Ile-Ife, Nigeria |
| |
Abstract: | A combination of multivariate statistical methods including factor analysis, principal component analysis, principal component
regression, and multiple linear regression (MLR) were employed to evaluate the influence of seasons on the concentrations
of ozone, sulfur (IV) oxide, and oxides of nitrogen in ambient air of Nigerian cities of Lagos and Ilorin. The former city
is located in the coastal area, and it is highly congested with a high intensity of marine, vehicular, and industrial activities,
and the latter city is a medium size town, located in the central guinea savannah zone of Nigeria. Samples were collected
using a high-volume sampler from near the ground at various sites of diverse human and industrial activities, during wet and
dry seasons from 2003 to 2006. The PCA reveals three distinct groupings during the day for all data, which is a reflection
of different factors contributing to the atmospheric chemistry of these cities. The predicted ozone concentration values by
MLR agree fairly well with the measured data. The dependence of ozone on meteorological parameters including relative humidity,
air temperature, and sun exposure and the precursor pollutants depends on weather and the anthropogenic activities. The results
for the two cities indicate that reduction in the level of NO2 is accompanied by an increase in the level of ozone, suggesting the interconversion between the two via photochemical activity. |
| |
Keywords: | Multivariate methods Principal component analysis (PCA) and regression (PCR) Atmospheric chemistry Environmental pollution Ozone prediction |
本文献已被 SpringerLink 等数据库收录! |
|