Dispersion Modeling of Nitrogen Dioxide in Ambient Air of Ahvaz City

Abstract

Background: Air emission modeling is used to study how pollutants are spread in the environment and to forecast their emissions rate in different climatic conditions in the study area. Today, air pollution threatens human public health and the environment, and Ahvaz is considered one of the main centers of air pollution in Iran. Objectives: This aim of this study was to evaluate the nitrogen dioxide distribution in Ahvaz by using the software program Screen 3. Materials and Methods: This analytical study was conducted in 2013 in Ahvaz. Data collections were performed by the Ahvaz Department of Environment. After processing the data received (averaging instruction set, coding), the file was converted to an input file for the software program Screen 3. In the next phase, study of the distribution and release of nitrogen dioxide during the year 2013 was modeled using the Screen 3 software. Results: Based on the results of this study, the highest and the lowest nitrogen dioxide concentration were in the Bureau of Meteorology and Head office of ADoE stations, respectively. The maximum concentration of NO 2 , at a height of 45 m, was 20 μg/m 3 .According to the findings of the modeling, examination of the combustion process was observed, and this was caused by the amount of nitrogen dioxide emitted by flue outlets, which was affected by temperature and pressure, fuel flow rates and inlet air temperature. Also, results showed that in most cases emission of air pollutants was towards the southwest. Conclusions: Results of this study showed that the Screen3 software is one of the popular models for estimating the distribution of air pollutants. Nitrogen dioxide emissions are highly regulated in most industrialized regions. Decreased emissions from fuel combustion, the use of scrubbers and filters that absorb pollution can be very useful for reduction and control of nitrogen dioxide emissions.

Artificial intelligence accuracy assessment in NO2 concentration forecasting of metropolises air

“…Nitrogen dioxide (NO 2 ) is one of the important families of air-polluting chemical compounds worldwide. NO 2 gas is emitted from indoor sources (gas stoves, vented gas heaters, and smoking) and outdoor sources (high-temperature combustion process, mobile sources such as vehicles and traffic, and industrial processes) 5 , 6 . Moreover, a mainly part of NO2 concentration linked to secondary production of NO 2 in air through photochemical processes.…”

Quantification of Mortality Associated with Particulate Matter Using Air Q model in Ambient Air in Shiraz, Iran

“…Features and advantages of the Air Q model include: encompassing features of other models such as CMAQ and OrAM, and the ability to make evaluation using all reference pollutants. One of the most important features of the Air Q model is its ability to generate risk of relative (rr, the likelihood ratio of a complication in the exposed population to the possibility of the same complication in the non-exposed group) [18]. The relative risk was calculated through the following equation.…”

“…Attributed proportion (AP, percentage of health consequences directly attributable to the pollutant) [1] and the baseline incidence (BI, the number of cases within one year), were calculated based on epidemiological studies conducted by the WHO and systematic reviews. The Air Q model is particularly suitable for industrialized cities such as Shiraz [4,18]. AP is part of health outcomes that can be attributed to specific demographic exposures over a given time (on the assumption of a link between exposure and health outcome in the distorting influence absence) [19].…”

Evaluation of Refusing the Medication Errors Report by Nurses of Golestan Educational Hospital After the Healthcare Reform From 2014 to 2015

“…2017; 6(4):e61906. km 2 , is located between 48°-49°and 29 East of the Greenwich meridian and 31°and 45 North of the equator (48)(49)(50)(51)(52)(53)(54). Golestan educational hospital is a tertiary-care hospital with 450 equipped beds, located in the Southwest of Ahvaz.…”