Assessment of the Environmental Impacts of COVID-19 in Urban Areas—A Case Study of Iran

The Severe Acute Respiratory Syndrome-Coronavirus Outbreak 2019 (CO-VID-19) has caused worldwide concern and has affected all aspects of human life. The study objective is to assess and evaluate the direct and indirect positive and negative environmental effects of COVID-19 in urban areas. Collected data for Iran as a case study is presented, comprehensively completing the dynamic effect of COVID-19 on the environment. The analysis results indicate that despite the temporarily positive effects of coronavirus on the environment, such as improvement in air quality (15% - 20% reduction of NO2 in Tehran), environmental noise reduction, cleaner beach and coastal areas due to implementing lockdowns, there are negative short- and long-term effects such as excessive water consumption (10% - 40% increase in Iranian ci-ties), reduce in waste recycling and significant increase in both residential and medical solid waste generation (10% - 77% increase in medical waste generation and 10% - 50% increase residential waste generation in Iranian cities), which leads to pollution or/and degradation of the environment (air, water and land). Moreover, with the global economic relaunching relaunch in most countries in the coming months, it could result in adverse effects such as increase in the greenhouse gas emissions. Assessment of environmental impacts, type and scale, could help for better planning and mitigation of the future

death [6]. The genome of SARS-CoV-2 is 96% identical to the bat coronavirus [10]. COVID-19 has apparently been transferred from animals to humans at the animal market in Wuhan, China. COVID-19 pandemic has resulted, in addition to challenges of world public health, in significant changes and worldwide disruption affecting all aspects of human life as well as the environment [5]. As of July 26 th , 2020, the cumulative number of confirmed cases of CO-VID-19 has exceeded 15.7 million, with about 640 thousand deaths in 216 countries or territories [11]. The worldwide disruption has resulted in numerous impacts on the environment and the climate. Some of those are positive such as (albeit likely temporary) drop in air pollution, reduction in the use of fossil fuels, and wildlife reclaiming contested habitats, while others are negative such as growing piles of infected waste like tissues, old face masks and overuse of water.
The aim of this paper is to look at the environmental impacts and consequences of COVID-19 pandemic in urban areas backed up by collected data (post-pandemic) and comparing them with pre-pandemic existing data for urban centers in Iran as a case study. Most recently published articles such as Kerimray et al. (2020), Lal et al. (2020) and Wang and Su (2020) have mainly discussed the impact on air quality and its improvement due to lockdown during pandemic at different parts of the world [5] [16] [20]. In this paper, other environmental aspects have been evaluated as well. Outcomes of such studies could be beneficial in planning management strategies to cope with post-pandemic environmental impacts in the future.

Background Information
The map of IR Iran as well as the statistics from the World Health Organization (WHO) in terms of number of confirmed cases and deaths due to COVID-19 is presented in Figure 2. Similar to most other countries, the government of IR Iran initially implemented a lockdown in order to control the pandemic. However, since the IR Iran economy was already experiencing negative growth rate and high inflation due to the United States' 2018 withdrawal from the nuclear deal and re-imposition of sanctions, the lockdown ended towards the end of April and businesses resumed their activity. This has resulted in a second wave of COVID-19 infections and outbreak, as seen in Figure 2, and the IR Iranian government implemented partial lockdown in parts of the country again.

Residential and Medical Waste
The COVID-19 outbreak poses many challenges to solid waste management in urban areas. The high demand for disposable medical products due to coronavirus has led to an increase in medical waste generation. For example, in Wuhan, China, with over than 11 million people, which was the epicenter of the new Coronavirus, the amount of medical (hazardous) waste at the peak of Corona disease rose from 40 to 240 tons per day, much more than the amount that the city's only dedicated facility can incinerate per day [21]. Not only this brings many environmental problems, but it also puts workers, cleaners, and other individuals who have to spend a lot of time in public places or in the waste collection and disposal industry at risk as infected collected waste during a pandemic might facilitate the spread of COVID-19 [1]. Therefore, employing security Figure 2. Map of Iran and number of confirmed and deaths due to COVD-19 pandemic [11]. equipment wastes such as gloves and masks is that these products could be contaminated. Thus, this type of waste can be a c and infect other waste with the virus, which means producing several thousand garbage infected with the Coronavirus. Therefore, special measures must be taken to properly secure or incinerate these types of hazardous wastes, which will be costly. Recently, a non-governmental organization (Asian Ocean Environment) conducted a study in Hong Kong where a large number of disposable masks were thrown away, covering up to 100 meters from the beach. The adverse effects of such medical waste will appear in the future. When they enter the natural habitat of animals (land and ocean), they could get consumed by animals leading to infection or death [22]. In addition to medical waste, the volume of non-recyclable municipal waste also increased significantly, and the disposal of this waste required more landfill space, which in turn poses many challenges for the environment [23] [24] [25] [26]. For example, plastic packaging has soared in popularity during the coronavirus pandemic perceived as a more sanitary option, food shoppers have resumed using plastic bags for packaging food products at checkout points citing health concerns over reusable bags by consumers. Furthermore, due to quarantine policies, many people have increased their consumption of take-away food delivered with plastic packaging, which has led to an increase in the amount of non-biodegradable wastes and ultimately contamination of water and oceans.
The sharp decline in agricultural and fisheries exports has also resulted in the accumulation of piles of organic waste. Local waste problems have risen as many municipalities have suspended their recycling activities out of fear of spreading the virus to recycling centers. All of these developments have brought disastrous challenges for the waste management industries and authorities, and subsequently for the environment. With the advent of import restrictions on export markets and the sharp decline in the availability of freight forwarding services, the Coronavirus crisis has caused a rise in the volume of agricultural and nonportable fishery commodities. Many export-oriented manufacturers produce large quantities to make the product attractive to local markets, and thus organic waste levels have climbed significantly. Decayed organic wastes are expected to contribute to CH 4 emissions and sharply increase during the crisis and immediately post-crisis months [27].
Based on the data collected by Iran Waste Management Organization, a rise in waste production, both for municipal and medical wastes, has occurred in Iran as well. As shown in Figure 3, during the COVID-19 pandemic the amount of both medical and household wastes increased dramatically, between 10% to 77% in some of the metropolises in Iran. This resulted in logistical problems and significantly increased the work force and collection vehicles required. Similar issues have been reported elsewhere. For example, the Ontario Waste Management Association reported that for the period of March 9 to April 13, there was a pronounced increase in residential waste compared to the same period in 2019, which is equivalent to more than 600 full waste trucks. The increased amount of waste produced not only requires more landfill space but also escalates the pandemic problem as it has been reported that solid waste could be a transmission route for COVID-19 particularly in developing countries where waste management is poor [28]. The increased quantities of infected waste also increase the risk of groundwater and soil contamination with the Coronavirus.
Al Huraimel et al. (2020) proposed some strategies to mitigate the solid waste COVID-19 related issues [1]. These include separate collection services for hot spots (residential areas with high infection rates), suspending recycling programs both at source and material recovery facilities and transporting the waste to a secured landfill or incineration facility. The best waste management strategies should be implemented to limit workers' exposure to contaminated waste as well.

Increased Water Consumption and Wastewater Generation
Excessive water consumption for washing and cleaning along with greater than normal sewage generation is one of the consequences caused by the Coronavirus pandemic [29]. States and cities have taken precautionary measures to ensure continuous access to clean water for drinking, washing and other uses during COVID-19. This would put more pressure and creates more demand on water and wastewater treatment and distribution systems, which would require more workers, as well as the manufacturers and suppliers who provide vital services and materials to this sector. Figure 4 shows the increase of water consumption of major cities in IR Iran during the Coronavirus pandemic. According to the chief executive officer of Tehran Water and Sewerage Company, the water consumption of Tehran, the capital, increased by 300,000 cubic meters and reached  in water consumption compared to the same period in the previous years.  pandemic leading to more air pollution, city traffic and its devastating consequences. Increasing gas emissions from factories and motor engines after the end of lockdowns not only could have significant effects on the environment but also affect human health. For instance, some dangerous components including mercury, lead, dioxins, and benzene, which are often released during the combustion of gasoline or coal could have numerous health impacts. In 2018, nine out of ten people breathed polluted air, which killed 7 million people that year [31]. Thus, if the air pollution consequences due to world's economic rapid re-launching are not managed properly, the environmental damages caused by air pollution could be more destructive than before.

Increased Inclination to Consumption of Fossil Fuels
Another issue is the potential increase in using fossil fuels. In recent years, researchers have sought to find alternatives to new and renewable sources of fossil fuels to mitigate global warming and greenhouse gas (GHG) emissions and to promote sustainable development. However, during the coronavirus recession, oil prices have plummeted sharply in world markets that could be bad news for the environment. Low-cost energy usually leads consumers to utilize it less efficiently and make people less inclined toward projects like retrofitting homes and offices to save energy. As industries and people, regardless of the destructive effects of fuels, are always looking for less expensive energy, there is likely to be a growing trend toward consumption of fossil fuels, as opposed to green sources, resulting in increased GHG emissions and other adverse impacts.
Coronavirus has also had destructive impacts on the climate. Lockdowns and social distancing have decelerated climate studies around the globe or ground it to a halt. For example, fieldwork everywhere has been canceled or postponed, and study flights to the Arctic have been stopped.

Adverse Impacts on Natural Resources, Wildlife and Ecotourism
Natural ecosystems and protected species have been at risk during the COVID-19 crisis due to temporarily reduced or lack of monitoring, management and maintenance. In many countries, environmental protection workers who are responsible for protecting national parks, land and marine conservation zones are required to stay at home during lockdown, leaving these areas unmonitored. Therefore, their absence could result in an increase in illegal deforestation, fishing and hunting of wild animals. Delays in career training, in combina- tion with the economic and psychological impacts of the new Coronavirus, may lead to some individuals to leave the field of conservation biology and follow other occupations that offer more stability or better income, which could result in future shortage of trained and skilled workforce in this field. Tourism industry is one the hardest hit businesses (hotels, airlines, etc.). The same applies to ecotourism. In many cases the ecotourism destinations are managed by local people and are the only source of income in these regions. With almost complete halt of this industry, following rising unemployment, could lead to the workforce to migrate from the region or to switch to harvesting the natural resources and encroachment, which in turn could have adverse impacts on natural resources and habitat of wildlife and cause environmental degradation [22]. Environmentalists predict that African countries will experience a huge rush in bushmeat poaching. According to Matt Brown of the Nature Conservancy, when there would not be any other alternative for people's income, the expectation is that poaching will go up for valuable products like rhino horn and ivory [32] [33]. It is also possible that after the re-opening of the economy and wood-dependent factories, the rate of production will increase, to compensate losses, to beyond sustainable levels which will increase deforestation [34].

Improvements in Air Quality during Pandemic
The most obvious impact of COVID-19 pandemic during the lockdown has been the significant reduction in transportation and business activity of some specific sectors. In Italy, the largest travel restrictions have been applied since World War II. In London, almost all businesses that depend on public attendance such as cafes, restaurants, theaters and other crowded public places were completely closed, since people were asked to stay at home [35]. Flights were canceled around the world, schools and academic institutes as well as factories were closed, public transportation plummeted. All of these measures were taken to control the outbreak of the coronavirus and to reduce the mortality rate. One of the immediate positive environmental effects in urban areas was improved air quality due to reduction of air pollutant emissions [16] Figure 6 clearly show a sharp and significant reduction of NO 2 concentration in North America and India. The improvement in air quality was more palpable in developed countries due to a stronger economy, whereas in developing and undeveloped countries these changes were not as noticeable since complete shutdown of businesses and industries was not possible for their economic status. In Iran, as a developing country and the case of study, a significant decrease in air pollution during the quarantine was not observed. Figure 7 presents measured concentrations of NO 2 and PM 2.5 during pandemic and the same time duration in 2019. As shown in Figure 8, the main source NO 2 is mobile sources, i.e., traffic related. Consequently, during the pandemic lockdown a slight decrease in the range of 15% -20% reduction in daily concentrations was observed. In the case PM 2.5 , the main source is fixed sources, including factories, refineries, boilers, and power plants, and no specific trend was observed.

Reduction in Noise Pollution
Noise is a physical form of pollution and is not life threatening. Noise pollution is the result of modern industrialized urban life and anthropological activities such as use of machines, transportation and traffic systems [43]. Even though     noise pollution is not fatal to human life, yet its importance cannot be overlooked. Environmental noise pollution is one of the main sources of discomfort for the population and the environment and causes health problems because repeated exposure to noise reduces the sleeping hours and productivity and efficiency of a human being and changes the natural conditions of ecosystems [44]. According to the WHO, noise levels above 65 decibels (dB) are considered as noise pollution. Vehicles, especially personal cars are the main source of noise  [41]. New urban management practices to combat the spread of the coronavirus, such as telecommuting, performing many daily programs, online activities and continuing this lifestyle even after the end of this period, can reduce many environmental pollutants, including noise pollution.

Reduction in Water Pollution
Beaches and coastal areas are one of the most important natural assets for both local residents and visitors. They provide services for recreation and tourism that are vital to the survival of coastal communities and have inherent values that must be protected from overuse [45]. However, improper management and use by people have caused many beaches around the world to suffer from pollution and adverse anthropogenic impacts including water and soil pollution, loss of marine habitat, etc. [46]. The lack of tourists and related activities such as boating as a result of the lockdown of the Coronavirus has led to significant positive changes in many coastal areas such as beaches in Acapulco, Barcelona or Salinas. In Venice, for example, water in the canals within the city was reported to be clearer and experienced greater water flow [47]. According to the Director General of Environment of Mazandaran, north of Iran, the closure of tourist centers, and the reduction of maritime transport due to COVID-19, gave the environment an opportunity to recreate. Also, the amount of effluent discharged into the sea decreased sharply, which resulted in having more opportunities for aquatic animals to spawn, and thus the Caspian Sea experienced tranquility.

Return of Tranquility to the Forests and Wildlife Habitat
The outbreak of coronavirus and subsequent quarantine in various countries around the world has been accompanied by improved environmental conditions, wildlife and natural resources. Reducing traffic at resorts has not only revitalized the habitats of medicinal plants and improved the fertility of wildlife, but has also reduced wildlife casualties on the roads. In the United States, fatal vehicle collisions with animals such as deer, elk, moose, bears, mountain lions fell by 58% during March and April [48]. The ban on presence and traffic in national parks and protected areas and the decrease in the presence of tourists in nature have resulted in the reduction in the destruction and seizure of natural resources, forests, reduced waste production and a return of sense of peace to national parks. Reports from environmental activists indicate that in some countries, with the streets being deserted, animals have also entered the cities. Also, the closure of the timber industry and the reduction of exports and imports of timber have returned calm to the forests. According to statistics from January to February 2020, imports/exports of wood and paper products (including furniture) in major countries fell from 6% (US) to 27% (Brazil) compared to last year (Table 1). Among the countries that have experienced this decline are Chile (−24%), China (−20%), New Zealand (−17%), the Republic of Korea (−16%), Japan (−14%) and Canada (−11%) [34]. consequences such as increased quantities of solid waste, increased water demand, and the lack of management and monitoring of natural ecosystems. Furthermore, it should be noted that the positive impacts of the coronavirus epidemic not only are all likely to be temporary and it is currently not clear how conservation will fare in the aftermath of the pandemic, but may also worsen environmental conditions after the re-opening of industries, factories and transportation. Overall, results of such studies help understand the pandemic related issues in the environmental context. This would help decision makers in planning mitigation plans for future pandemics. Hence, the current coronavirus pandemic is both an opportunity and a threat. It is an opportunity to revisit the lesser-known threats to strengthen and plan for the future. Governments, communities and companies can and should use the opportunity to see how we got here, what is not working, and ask how we can plan better for our future.