Spatial Analysis of Environmental Hazards

Spatial Analysis of Environmental Hazards

"Relationship between Covid-19 and changes in air pollutants using satellite imagery (Case study: Tehran, Isfahan and Mashhad metropolises)"

Authors
zeinab shogrkhodaei 1
amanollah Fathnia 1
Vahid Razavi Termeh 2
1 Razi university
2 K. N. Toosi University
Abstract
Study the Effects of Covid-19 on Air Pollutants by Using Sentinel-5 Satellite Images (Case Study: Metropolises of Tehran, Isfahan, and Mashhad)



Zeinab shogrkhodaei, PHD. Student of Climatology, Faculty of Literature and Humanities, Department of Geography, Razi University

Amanollah Fathnia*, Assistant Professor of Climatology, Faculty of Literature and Humanities, Department of Geography, Razi University

Vahid Razavi Termeh, PHD. Student of GIS, Faculty of Geodesy and Geomantic, K. N. Toosi University.



Introduction

One of the challenges facing the international community right now is Covid-19. This pandemic has caused a comprehensive change in behavior contrary to the usual routine, which can lead to changes in people's lifestyles (Briz-Redón et al., 2021). The prevalence of this disease has not only affected the economy and health, but also the environment (Sohrabi et al., 2020). Among the effects of Covid-19 on the environment are the effects on beaches, noise, surface and groundwater, municipal solid waste, and air quality (Zambrano-Monserrate et al., 2020). The restrictions applied during the Covid-19 era were accompanied by a reduction in greenhouse gas emissions by transport and industry, which affected air quality (Rybarczyk and Zalakeviciute, 2020). Air is a vital element for the survival of all living things, but human activities have caused the release of many harmful pollutants into the atmosphere and endangered human health (Ghorani-Azam et al., 2016). Among the causes of death, air pollution is the fourth leading cause of death in the world after tobacco (WHO, 2020a). Sulfur dioxide, nitrogen oxide, carbon monoxide, and ozone are some of the pollutants that cause short-term or long-term exposure to heart and lung disease (Briz-Redón et al., 2021). Human activities are one of the main sources of air pollutants, so their concentration is expected to decrease during the Covid-19 period (Ghahremanloo et al., 2021).

Materials and methods

In this study, the required data were the average monthly pollutants of sulfur dioxide, nitrogen dioxide, carbon monoxide and ozone before (20 February 2019 to 20 February 2020) and after (20 February 2020 to 20 February 2021) the prevalence of Covid-19 virus. For this purpose, Sentinel-5P satellite images were used to prepare the required data set. The case study included three metropolises of Tehran, Mashhad, and Isfahan. Google Earth Engine was used to access Sentinel-5P satellite images. The final output of the images for each pollutant was interpolated for better display and exposure in GIS software using the kriging method. Then, a T-test was used to compare the differences between the concentrations of contaminants before and after the outbreak of the Covid-19 virus and to evaluate the mean correlation. Based on this test, values that were p-value <0.05 were considered significant. This was considered as a change in the concentration of the contaminant before and after the Covid-19 virus (decreasing or increasing). Those pollutants with a p-value <0.05 were considered unchanged.

Results and Discussion

Analysis of the T-test showed that for pollutants such as sulfur dioxide, nitrogen dioxide, and carbon monoxide in all three metropolises, there was no significant change in their concentration before and after the outbreak of the Covid-19 virus. However, significant changes were observed for ozone pollutants. Also, its concentration trend in all three metropolises has been a decreasing trend. The main sources of emissions of nitrogen dioxide, carbon monoxide, sulfur dioxide, and ozone are related to human activities, including transportation and industry (Ghahremanloo et al., 2021; Cárcel-Carras et al., 2021). Pollutants such as carbon monoxide, nitrogen dioxide and sulfur dioxide are the primary pollutants; It means that they are emitted directly from sources, while ozone is a secondary pollutant and depends on complex and nonlinear atmospheric chemistry (Bekbulat et al., 2021). Given that the concentration of ozone surface decreases significantly with increasing concentration of nitrogen dioxide. When nitric oxide (NO) emissions are high enough, the NO released into the atmosphere converts a large portion of ozone to nitrogen dioxide (Hashim et al., 2021). In addition, in all three cities, when the concentration of nitrogen dioxide increased, we saw a decrease in the amount of ozone concentration. In addition, during the Covid-19 era, many industries that produced primary pollutants, including carbon monoxide, nitrogen dioxide, and sulfur dioxide, were not on the closure list or were telecommuted. Despite the decline in the performance of some activities, important sectors such as manufacturing plants, industrial and mining centers, agriculture, and public transportation have continued to operate even during severe restrictions. The mean difference between the concentrations of nitrogen dioxide before and after the outbreak of Covid-19 was positive. However, this average difference is small. However, the concentration of nitrogen dioxide is slightly increased, especially in cold seasons; Therefore, it can be said that ozone concentration has decreased.



Keywords: Covid-19, Air Pollutants, Remote Sensing, Sentinel-5.




































Keywords
COVID-19
Air Pollutants
Remote Sensing
Sentinel-5
GIS
Ali, S. M.; F. Malik, M. Anjum, S. Siddiqui, G. F. Anwar, M. N. Lam, S. S., ... and M. F. Khokhar. 2021. Exploring the linkage between PM2. 5 levels and COVID-19 spread and its implications for socio-economic circles. Environmental Research, 193: 110421.
Azuma, K.; N. Kagi, H. Kim, and M. Hayashi.2020. Impact of climate and ambient air pollution on the epidemic growth during COVID-19 outbreak in Japan. Environmental research, 190:110042.
Bayat, R., K. Ashrafi, M. Motlagh, S. Hassanvand, M. S. Daroudi, R. Fink, and N. Künzli. 2019. Health impact and related cost of ambient air pollution in Tehran. Environmental research, 176: 108547.
Berman, J. D. and K. Ebisu. 2020. Changes in US air pollution during the COVID-19 pandemic. Science of the Total Environment, 739: 139864.
Borsdorff, T.; H. Hu, O. Hasekamp, R. Sussmann, M. Rettinger, F. Hase, ... and J. Landgraf. 2018. Mapping carbon monoxide pollution from space down to city scales with daily global coverage. Atmospheric Measurement Techniques, 11 (10): 5507-5518.
Briz-Redón, Á.; C. Belenguer-Sapiña, and Á. Serrano-Aroca. 2021. Changes in air pollution during COVID-19 lockdown in Spain: a multi-city study. journal of environmental sciences, 101: 16-26.
Cárcel-Carrasco, J.; M. Pascual-Guillamón, and J. Langa-Sanchis.2021. Analysis of the effect of COVID-19 on air pollution: perspective of the Spanish case. Environmental Science and Pollution Research, 1-14.
Chu, B.; S. Zhang, J. Liu, Q. Ma, and H. He. 2021. Significant concurrent decrease in PM2. 5 and NO2 concentrations in China during COVID-19 epidemic. Journal of Environmental Sciences, 99: 346-353.
De Vries, J.; R. Voors, B. Ording, J. Dingjan, P. Veefkind, A. Ludewig, ..., and I. Aben. 2016. TROPOMI on ESA’s Sentinel 5p ready for launch and use. In Fourth International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2016) (Vol. 9688, p. 96880B). International Society for Optics and Photonics.
Fan, C.; Y. Li, J. Guang, Z. L. Elnashar, M. Allam, and G. de Leeuw. 2020. The impact of the control measures during the COVID-19 outbreak on air pollution in China. Remote Sensing, 12(10): 1613.
Ghahremanloo, M.; Y. Lops, Y. Choi, and S. Mousavinezhad. 2021. Impact of the COVID-19 outbreak on air pollution levels in East Asia. Science of The Total Environment, 754: 142226.
Ghorani-Azam, A.; B. Riahi-Zanjani, and M. Balali-Mood. 2016. Effects of air pollution on human health and practical measures for prevention in Iran. Journal of research in medical sciences: the official journal of Isfahan University of Medical Sciences,21.
Hashim, B. M.; S. K. Al-Naseri, A. Al-Maliki, and N. Al-Ansari. 2021. Impact of COVID-19 lockdown on NO2, O3, PM2. 5 and PM10 concentrations and assessing air quality changes in Baghdad, Iraq. Science of the Total Environment, 754 :141978.
Ju, M. J.; J. Oh, and Y. H. Choi. 2021. Changes in air pollution levels after COVID-19 outbreak in Korea. Science of the Total Environment, 750:141521.
Kaplan, G.; Z. Y. Avdan, and U. Avdan. 2019. Spaceborne Nitrogen Dioxide Observations from the Sentinel-5P TROPOMI over Turkey. In Multidisciplinary Digital Publishing Institute Proceedings (Vol. 18, No. 1, p. 4).
Mostafa, M. K.; G. Gamal, and A. Wafiq. 2021. The impact of COVID-19 on air pollution levels and other environmental indicators-A case study of Egypt. Journal of environmental management, 277:111496.
Naddafi, K.; M. S. Hassanvand, M. Yunesian, F. Momeniha, R. Nabizadeh, S. Faridi, and A. Gholampour. 2012. Health impact assessment of air pollution in megacity of Tehran, Iran. Iranian journal of environmental health science & engineering, 9(1): 1-7.
Ogen, Y. 2020. Assessing nitrogen dioxide (NO2) levels as a contributing factor to coronavirus (COVID-19) fatality. Science of the Total Environment, 726: 138605.
Otmani, A.; A. Benchrif, M. Tahri, M. Bounakhla, M. El Bouch, and M. H. Krombi. 2020. Impact of Covid-19 lockdown on PM10, SO2 and NO2 concentrations in Salé City (Morocco). Science of the total environment, 735: 139541.
Peralta, O.; A. Ortínez-Alvarez, R. Torres-Jardón, M. Suárez-Lastra, T. Castro, and L. G. Ruíz-Suárez. 2021. Ozone over Mexico City during the COVID-19 pandemic. Science of The Total Environment, 761:143183.
Rad, A. K.; M. Shariati, and M. Zarei. 2020. The impact of COVID-19 on air pollution in Iran in the first and second waves with emphasis on the city of Tehran. Journal of Air Pollution and Health.
Rojas, J. P.; F. R. Urdanivia, R. A. Garay, A. J.García, C. Enciso, E. A. Medina, ... and M. A. Leiva-Guzmán. 2021. Effects of COVID-19 pandemic control measures on air pollution in Lima metropolitan area, Peru in South America. Air Quality, Atmosphere & Health, 1-9.
Rybarczyk. Y, and R. Zalakeviciute. 2021. Assessing the COVID‐19 impact on air quality: A machine learning approach. Geophysical Research Letters, 48(4): e2020GL091202.
Shahbazi, H.; M. Reyhanian, V. Hosseini, and H. Afshin. 2016. The relative contributions of mobile sources to air pollutant emissions in Tehran, Iran: an emission inventory approach. Emission control science and technology, 2(1): 44-56.
Siddiqui, A.; S. Halder, P. Chauhan, and P. Kumar.2020. COVID-19 Pandemic and City-Level Nitrogen Dioxide (NO2) Reduction for Urban Centres of India. Journal of the Indian Society of Remote Sensing, 48(7): 999-1006.
Sohrabi, C.; Z. Alsafi, N. O'Neill, M. Khan, A. Kerwan, A. Al-Jabir and R. Agha. 2020. World Health Organization declares global emergency: A review of the 2019 novel coronavirus (COVID-19). International journal of surgery, 76:71-76.
Stratoulias, D, and N. Nuthammachot. 2020. Air quality development during the COVID-19 pandemic over a medium-sized urban area in Thailand. Science of The Total Environment, 746: 141320.
Vadrevu, K. P.; A. Eaturu, S. Biswas, K. Lasko, S. Sahu, J. K. Garg, and C. Justice. 2020. Spatial and temporal variations of air pollution over 41 cities of India during the COVID-19 lockdown period. Scientific reports, 10(1): 1-15.
Vîrghileanu, M.; I. Săvulescu, B. A. Mihai, C. Nistor, and R. Dobre. 2020. Nitrogen Dioxide (NO2) Pollution Monitoring with Sentinel-5P Satellite Imagery over Europe during the Coronavirus Pandemic Outbreak. Remote Sensing, 12(21): 3575.
Zambrano-Monserrate, M. A.; M. A. Ruano, and L. Sanchez-Alcalde. 2020. Indirect effects of COVID-19 on the environment. Science of the Total Environment, 728: 138813.