Environmental Project's Achievements Reports Query System

Ozone Precursor Monitoring and Analysis

Absrtact	In general, ozone will be formed in suburban area or downstream of industrial area due to the transport and reactions of the air pollutants. The entire environmental conditions are quite complicated and it is difficult to identify the environmental condition that ozone is formed. However, the developments of high resolution photochemical model which include the physical-chemical parameters like photochemical reactions, transport, precipitations and emission will be helpful to verify the sources and reactions of ozone pollution. In this study, a high resolution air quality model will be used to study the characteristics of the temporal and spatial ozone distribution in Taiwan. The concentrations of the ozone precursors obtained by the PAMS will be compared to evaluate the photochemical reactions in areas with high ozone concentrations. The roles of sources, geographic factors and meteorological conditions in ozone pollution will be studied. Specific objectives of this study are: (1)to conduct data analysis and model simulations on VOCs data obtained from PAMS. (2)to study the correlations between the VOCs data and the ozone episodes. (3)to evaluate the potential applications and interpretations of the air quality data obtained from PAMS. (4)to provide recommendations for the air quality predictions. The results revealed that the most important VOCs observed are Toluene、iso-Butene、Ethane、Propane、Ethene、iso-prene、Acetylene and n-Butane. In general, the ozone concentration increases several hours after the VOCs concentrations in PANS reach their maximum concentrations. However, the photochemical process is a highly complicated reaction. Although higher VOC concentrations may favor the ozone formation, several cases demonstrated that ozone episodes may be observed even when the concentrations of VOCs in PAMS are low. It is essential to monitor both the concentrations of VOCs and NOx, and the meteorological conditions should be evaluated for possible predictions of ozone episodes.
Keyword	ozone,Photochemical Assessment Monitoring Station,VOCs,model

Absrtact

In general, ozone will be formed in suburban area or downstream of industrial area due to the transport and reactions of the air pollutants. The entire environmental conditions are quite complicated and it is difficult to identify the environmental condition that ozone is formed. However, the developments of high resolution photochemical model which include the physical-chemical parameters like photochemical reactions, transport, precipitations and emission will be helpful to verify the sources and reactions of ozone pollution. In this study, a high resolution air quality model will be used to study the characteristics of the temporal and spatial ozone distribution in Taiwan. The concentrations of the ozone precursors obtained by the PAMS will be compared to evaluate the photochemical reactions in areas with high ozone concentrations. The roles of sources, geographic factors and meteorological conditions in ozone pollution will be studied. Specific objectives of this study are: (1)to conduct data analysis and model simulations on VOCs data obtained from PAMS. (2)to study the correlations between the VOCs data and the ozone episodes. (3)to evaluate the potential applications and interpretations of the air quality data obtained from PAMS. (4)to provide recommendations for the air quality predictions. The results revealed that the most important VOCs observed are Toluene、iso-Butene、Ethane、Propane、Ethene、iso-prene、Acetylene and n-Butane. In general, the ozone concentration increases several hours after the VOCs concentrations in PANS reach their maximum concentrations. However, the photochemical process is a highly complicated reaction. Although higher VOC concentrations may favor the ozone formation, several cases demonstrated that ozone episodes may be observed even when the concentrations of VOCs in PAMS are low. It is essential to monitor both the concentrations of VOCs and NOx, and the meteorological conditions should be evaluated for possible predictions of ozone episodes.

Keyword

ozone,Photochemical Assessment Monitoring Station,VOCs,model