جستجوی مقالات مرتبط با کلیدواژه "air pollutants" در نشریات گروه "عمران"

One of the economic challenges facing developing countries is the cost of tackling air pollution and improving its quality. On the other hand, in addition to cost, the health of people in the community and existing diseases are also directly related to air quality. Therefore, the study and analysis of changes in air pollutants, including nitrogen dioxide, carbon monoxide, and ozone can provide valuable information for experts to analyze air quality. The presence of high-resolution spatial sensors to study a variety of applications has enabled experts in this field to study most environmental phenomena. In the present study, temporal and spatial changes of air pollutants were determined using Sentinel-5 satellite data in April 2016, simultaneously with the release of Covid-19 virus for Iran, and compared with the values of the same period in 1998. The spread of Covid-19 virus during this period had a variety of consequences that led to a reduction in factory activity as well as a decrease in vehicle traffic. Therefore, the present study seeks to investigate the effect of these factors by analyzing the temporal changes and spatial distribution of pollutants in the interval between these two times. The results confirm the improvement of air quality in this period compared to the previous year, April 1998. According to the results, the concentration of nitrogen dioxide in the entire barley column and tropospheric nitrogen dioxide , which is directly related to transportation and human activities, has decreased.

Nowadays, transportation demand management is considered as a solution to more efficient usage of transportation resources of a society. In order to achieve this objective, different types of policies including pricing policies in restricted area could be chosen. By applying such policies, which discourage people from car usage, traffic congestion and air pollution would be decreased in the restricted area. The objective of this study is to assess the impact of cordon pricing policy on reducing air pollution in the central part of the city of Isfahan. Therefore, by introducing cost parameters to the existing mode choice models, the transportation demand matrix is updated. By assigning the updated demand to the transportation network, a number of network performance indicators versus different cordon price have been investigated. This study shows that, the .Rials 175000 ratio of social benefits to transportation cost for the city will be maximized at