Monitoring Framework for Nitrogen Dioxide Measurement in a Tropical City: A Bangkok Case Study

Abstract

This study addresses a useful and simple way of assessing nitrogen dioxide (NO₂) concentrations measured at six monitoring stations in Bangkok Metropolitan Region (BMR), during January to December 2001. The measurements are further interpreted using corelationship between NO₂ concentrations and with traffic characteristics, street geometries, and meteorological parameters. Variations in diurnal and seasonal NO₂ levels are also identified. The finding shows that the measured NO₂ concentrations range from 55 μg m^-3 at the Yaowarat urban site to 26 μg m^-3 at the Phahonyothin suburban site. The monitoring method has important implications for general applicability to other tropical cities.