فهرست مطالب

Journal of Air Pollution and Health
Volume:5 Issue: 4, Autumn 2020

  • تاریخ انتشار: 1400/04/14
  • تعداد عناوین: 6
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  • Farham Aminsharei, Elham Asgari Kheirabadi, Amirreza Talaiekhozani Pages 203-208
    Introduction

    Air pollution is a major problem in Isfahan, one of the major cities of Iran. A large number of jewelry making workshops are located in Isfahan, yet there is insufficient information about their pollutants emission rates. The aim of this study is to determine the emission factors of nitrogen oxides and volatile organic compounds (VOCs) in Isfahan’s jewelry making workshops.

    Methods

    In the first step of this study, some jewelry making workshops were visited to find nitrogen oxides and VOCs emission sources. It was revealed that the only possible source of nitrogen oxides and VOCs in these workshops was use of the oxy fuel welding system used to melt gold. In the second step, a set of experiments was conducted to determine the emission factors of nitrogen oxides and VOCs while working with the oxy fuel welding system.

    Results

    The results of this study showed that the emission factor of nitrogen oxides in the oxy fuel welding system was 0.64 kg/kg consumed natural gas. It was also found that no VOCs were emitted while working with the oxy fuel welding system, since sufficient pure oxygen was produced in this system. Interview with managers of some jewelry making workshops showed that the average natural gas consumption in each workshop was 22 kg. Therefore, each jewelry making workshop in Isfahan emitted nearly 14.08 kg of nitrogen oxide per month.

    Conclusion

    It is revealed that in 2018, 81100.8 kg nitrogen oxides were emitted from jewelry making workshops into Isfahan’s atmosphere.

    Keywords: Nitrogen oxides, Emission factor, Jewelrymaking workshop
  • Akbar Gholampour, Arefeh Biglaric, Vahideh Barzeghar, Nasim Zolfaghari Firouzsalari Pages 209-222
    Introduction

    Bioaerosols consist of aerosols which are biologically originated and can be present ubiquitously in different environments, including the indoor air of hospitals. The objective of this study was to survey the bioaerosol type and density in various environments of four governmental educational hospitals in Urmia, Iran, namely the intensive care unit (ICU), operating room, the internal medicine room, the infectious diseases room, the infectious diseases corridor, and ambient air.

    Materials and methods

    Sampling was performed during summer and winter of 2019 at four different day-times using passive (sedimentation plate) and active methods (an Andersen one-stage viable impactor and Quick Take-30 sampling instrument) and by counting plates containing a bacterial and fungus-selective medium.

    Results

    The results revealed that the highest microbial bioaerosol load was related to the infectious diseases corridor (100 and 150 CFU/m3 for total bacterial and fungal load, respectively). The highest bacterial and fungal density was observed in the afternoon at 17-18; and the concentration of bioaerosols was higher in summer than winter. A comparison of indoor and outdoor bacterial loads showed that the indoor bacterial concentration mean (49.1±23.8 CFU/m3) was higher than the outdoor value (47.1±21.5 CFU/m3), and the indoor levels of fungal contamination (83.3±31.9 CFU/m3) were significantly lower than outdoor values (182.5±48.0 CFU/m3). The predominantly isolated bacteria were Staphylococcus (95%) spp, and the main isolated fungi belong to the genera Aspergillus (50%) and Penicillium (32%).

    Conclusion

    The results of this study can be useful in developing indoor air microbial quality guidelines in hospitals, which has not been done so far.

    Keywords: Indoor air quality, Bioaerosols, Bacterial airquality, Fungal air quality, Hospital wards, Urmia
  • Mohammad Sohelur Rahman, Md. Rafiqul Islam, Khondokar Nazmus Sakib, Md. Mohiuddin Tasnim, Selina Yeasmin Pages 223-232
    Introduction

    Radiation gives tremendous benefit to mankind but unnecessary radiation may pose harm to worker and public. The purpose of the studyis to continuous indoor radiation monitoring of Atomic Energy Centre Dhaka (AECD) campus to minimize the radiological risk on worker and public health in and around the campus.

    Materials and methods

    Continuous indoor radiation monitoring was conducted in the AECD campus from November 2018-April 2019 using the Thermoluminescent dosimeters. The excess life-time cancer risk on workerand public health were estimated based on the continuous indoor radiation monitoring data.

    Results

    The annual effective doses to the worker and public from indoor radiation were ranged from 0.28±0.11 mSv to 0.67±0.25 mSv and the mean wasfound to be 0.43±0.10 mSv. The excess life-time cancer risk (ELCR) on the radiation worker & public health were estimated based on the annual effective dose and ranged from 1.13 Χ 10-3 to 2.65 Χ 10-3 with an average of 1.72 Χ 10-3.The average annual effective dose and ELCR on worker and public health were lower than those of the worldwide average values.

    Conclusion

    The radiological hazard on worker and public health in and around the AECD campus is not significant because those values are lower than the recommended values of the international commission on radiological protection. Monitoring of these indoor places would help in keeping a record of safe working practices during the handling of the radioactive substances and radiation generating equipments in a radiological facility.

    Keywords: Radiation, Atomic energy centre Dhaka(AECD), Thermoluminescent dosimeter(TLD), Effective dose, Excess life-timecancer risk (ELCR)
  • Shijian Peng, Bensheng Zhao, Haiyan Zhang, Jia Wang, Baoqing Deng Pages 233-242
    Introduction

    Photocatalytic oxidation of gaseous pollutants in differential reactors is simulated using computational fluid dynamics.

    Materials and methods

    The momentum equation and pollutant transport are solved by using ANSYS Fluent. The SIMPLE algorithm is used to treat the pressure-velocity coupling. The laminar flow and low Reynolds k−ε models are used to describe turbulence.

    Results

    Velocity field distribution and degradation efficiency of different models at various flow rates were obtained and compared with the experimental data. The simulation results of degradation efficiency under different models are basically consistent.

    Conclusion

    Although low Reynolds k-ε models have better simulation results for high inlet flow rates, in terms of computation complexity, laminar flow is recommended for simulation.

    Keywords: Photocatalytic oxidation, CFD, Degradation efficiency
  • Alireza Khajeamiri, Yasaman Khajeamiri, Samira Sharifi, Nioosha Moradpour Pages 243-258

    The ambient air pollutants that have a major role in causing respiratory diseases are particulate matter, sulfur dioxide, nitrogen dioxide, ozone, carbon monoxide, and heavy metals. In addition, respiratory infections, divided into upper respiratory tract and lower respiratory tract infection, are most commonly caused by viral agents. Thus, in light of the current COVID-19 pandemic, this review has focused on the association between exposure to general air pollution including each of the mentioned air pollutants and viral respiratory infections. The gathered evidence from the reviewed studies in this article showed that most of these air pollutants have a positive correlation with mortality, severity, transmission, inflammation, and incidence of different viral respiratory infections. Whereas, some studies found contradictory results such as non-significant and negative connections between exposure to air pollutants and viral respiratory infections, which are further discussed in this text. Therefore, following the SARS-CoV-2 outbreak, these contradictions in the reported correlation between air pollution and different aspects of viral respiratory infections must be thoroughly investigated and cleared.

    Keywords: Air pollution, Upper respiratory infections, Lower respiratory infections, COVID-19, Influenza
  • Anurag Sinha, Shubham Singh Pages 259-272

    The issue of pollution in urban cities is a major problem these days especiallyin cities like the New Delhi is detected with more number of toxic gases in air, whic h has deduced the air quality of New Delhi. Thus, predictive analytics play a significant role in predicting the future instances of air quality based on the historical data. Forecasting the air quality of these cities is mandatory to overcome its consequences. Several machines learning algorithm is widely used these days to predict the future instances. Such as random forest, support vector machine, regression, classification, and so on. Main pollutants which present in the air are PM2.5, PM10, CO, NO2, SO2and O3 . In this paper we have focused mainly on data set of New Delhi for predicting ambient air pollution and quality using several machines learning algorithm.

    Keywords: Air pollution, Machine learning, Supportvector machine, Regression, Classification