Background & Objectives : Cutting leads to production of different hazardous agents such as fumes, particles, gases and vapors. In various studies, the effects of fumes, gases, and vapors on workers and environment have been proved. Meanwhile, cutting alloying plates with plasma cutting machine due to containing various alloy materials produces a lot of air pollution. Therefore, using the venti...

Background and Objectives: Emission of volatile organic compounds and unpleasant smell are the important characteristics of the rendering plant, causing disturbance for the workers and nearby residents. In order to prevent the spread of air pollutants and to provide favorable environment, application of treatment technologies is essential. Materials and Methods: In this study, in order to selec...

Background: Ventilation plays a crucial role in reducing the number of air transmitted pathogens in isolated rooms. Determination of the suitable type of ventilation system and the proper ventilating rate has always been a challenge. Patients’ bed arrangement and the location of the staff are also expected to influence the occupational exposure of the staffs’ to harmful airborne particles. The...

In this research a fire scenario was simulated in one of the stations of the line 7 of Tehran's subway system. The Line 7 is under construction and the ventilation system is under design. Fire was set for a stopping metro train at the platform of the station. A 160 meter length eight-car metro train with the forth wagon on the fire was studied. The heat release rate is based on a quadratic f...

Background and aims: Air pollution is a risk factor for human health and the environment. Due to the nature of the process and also to employing melting furnaces, the production and emission of some pollutants such as harmful dust is very high in the steel industry. Therefore, considering the importance of the issue, control of dusts of an alloy steel production company has been discussed in th...