DISPERSION AND ASSESSMENT OF FORMALDEHYDE EMISSIONS BY AUTOMOBILES AND THEIR INFLUENCE ON THE AIR QUALITY

Abstract

The paper deals with dispersion of formaldehyde, which is emitted by cars. According to our study of statistical data for Chernivtsi city, formaldehyde is the most dangerous component of the exhaust fumes.The intensity of the traffic as well as formaldehyde emission in city’s streets net according to a mathematical model of the chosen part of the Chernivtsi has been studied. Such modeling enables us to define the level of air contamination in any part of the chosen area. In the result of our research we defined the contour maps of concentration of formaldehyde.The objective of the study is to improve mathematical model, calculate 2D concentration profile of formaldehyde in surface air of the area under study with availability of wind, and conduct virtual experiment with different boundary conditions in the contours of the buildings and streets. The obtained results of the modeling are more accurate and more suitable for description of dispersion processes over crossroads. Under windy weather conditions, in particular during strong winds, we can observe considerable shift of concentration profiles of formaldehyde, and the highest pollution levels from motor vehicles that is observed and proven by the model in Holovna, Chervonoarmiyska, Prospekt Nezalezhnosti, Storozhynetska, Vynnychenka, Chapayeva, Stasiuka Streets. Realistic concentration profile is reached not only above the road but also over surrounding area and within the residential area.