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Microplastics (MPs) and nanoplastics (NPs) are plastic particles of concern worldwide as they negatively affect the environment and human health. The interactions of microorganisms with microplastics and nanoplastics are different. On one hand, microorganisms might biodegrade MPs/NPs through enzymes, but on the other hand, they serve as vehicles to spread diseases or negatively affect their viability. As a result, several studies have reported disturbances in soil balance and negative impacts on geochemical cycles. With an increasing number of investigations into microorganisms and their interactions with MPs and NPs, this study demonstrates a growing interest in biodegradable alternatives. A bibliometric analysis of 719 documents published from 2010 to December 2021 presents the research landscape on the interaction of microplastics and nanoplastics with microorganisms. The study shows that China, the United States, the United Kingdom, and Germany lead the scientific production on this topic. However, in situ studies of large-scale pilot applications in the environment are scarce. More research funding from governments in the form of national action that stimulates national and international cooperation through universities, institutes, and industries is required. There is an urgent need for studies focusing on the degradation mechanisms of various microorganisms through the characterization of enzymes involved in the chemical modification of these emerging contaminants (MPs/NPs) with transparent standard methodologies. Moreover, there is no standardization for MP/NP extraction or characterization methodologies for different environments, especially in atmosphere. The patent need for alternative pathways for MP/NP degradation is evident, using microorganisms such as bacteria, fungi, microalgae, and a consortium (peripheral biofilms) to mitigate the negative impact of the constantly increasing anthropogenic MP/NP pollutants in the world.

Building activity is a significant source of atmospheric contamination by ultrafine dust. Cognizant of this fact, those active in the use and recycling of construction materials must be aware of the risks associated with exposure to nanoparticles (NPs) and ultra-fine particles (UFPs), as well as the associated health impacts. This work analyzed NPs and UFPs generated in a small building-material recycling company using high-resolution electron microscopes and X-ray Diffraction. A self-made passive sampler (LSPS) that can obtain particulate samples without physical and morphological changes, especially where there is a suspension of particulate material, was used in this study. A total of 96 particulate samples, using the LSPS for three months in four seasons, were collected during the study. Thus, the dry deposition of the particles, which are considered highly harmful to human health, was found in each of the four seasons of the year. It is suggested that for future research, the toxicological evaluations of the particulates in the construction industry should be investigated through the consideration of measures to control and mitigate the health risks of workers regarding exposure to NPs and UFPs.

Today, air quality is one of the global concerns that governments are facing. One of the main air pollutants is the particulate matter (PM) which affects human health. This article presents the modeling of a purification system by means of negative air ions (NAIs) for air pollutant removal, using computational intelligence methods. The system uses a high-voltage booster output to ionize air molecules from stainless steel electrodes; its particle-capturing efficiency reaches up to 97%. With two devices (5 cm × 2 cm × 2.5 cm), 2 trillion negative ions are produced per second, and the particulate matter (PM 2.5) can be reduced from 999 to 0 mg/m3 in a period of approximately 5 to 7 minutes (in a 40 cm × 40 cm × 40 cm acrylic chamber). This negative ion generator is a viable and sustainable alternative to reduce polluting emissions, with beneficial effects on human health.

To better understand the changes in air pollutants in an industrial city, Handan, North China, during the COVID-19 lockdown period, the air quality and meteorological conditions were recorded from 1 January to 3 March 2020 and the corresponding period in 2019. Compared to the corresponding period in 2019, the largest reduction in PM2.5–10, PM2.5, NO2 and CO occurred during the COVID-19 lockdown period. PM2.5–10 displayed the highest reduction (66.6%), followed by NO2 (58.4%) and PM2.5 (50.1%), while O3 increased by 13.9%. Similarly, compared with the pre-COVID-19 period, NO2 significantly decreased by 66.1% during the COVID-19 lockdown, followed by PM2.5–10 (45.9%) and PM2.5 (42.4%), while O3 increased significantly (126%). Among the different functional areas, PM2.5 and PM2.5–10 dropped the most in the commercial area during the COVID-19 lockdown. NO2 and SO2 decreased the most in the traffic and residential areas, respectively, while NO2 increased only in the township and SO2 increased the most in the industrial area. O3 increased in all functional areas to different extents. Potential source contribution function analysis indicated that not only the local air pollution lessened, but also long-distance or inter-regional transport contributed much less to heavy pollution during the lockdown period. These results indicate that the COVID-19 lockdown measures led to significantly reduced PM and NO2 but increased O3, highlighting the importance of the synergetic control of PM2.5 and O3, as well as regional joint prevention and the control of air pollution. Moreover, it is necessary to formulate air pollution control measures according to functional areas on a city scale.

The COVID-19 pandemic has resulted in changes in consumer behavior and has created new opportunities and challenges for the provisioning of green products in emerging economies. The objective of this study was to identify how perceptions on COVID-19 affected the variables of planned behavior and responsible purchase intention during the pandemic in Colombia. A total of 320 consumers participated in an online survey, and the responses were analyzed using a structural equation model (SEM) and AMOS 24 statistical software. The results were positive regarding the development of better environmental awareness, indicating that COVID-19 (COV) influenced the attitude (ATT) of individuals and contributed to subjective norms (SNs) and perceived behavioral control (PBC), and that SNs and ATT influence eco-friendly purchase intention (EFPI). However, PBC does not contribute to EFPI. Colombian consumers have become aware of the importance to society of buying eco-friendly products, and planned behavior is an opportunity for organizations to formulate new portfolios relevant to the needs of the market. This is an important opportunity to sensitize consumers to the purchase of environmentally friendly products and for the identification of commercial strategies by companies that bet on the formulation and commercialization of eco-friendly portfolios that generate value for society.

Whale-watching tourism generates high-income seasonal livelihoods in coastal communities on the Mexican Pacific Coast; however, this sector is at risk from accelerated global changes. We evaluated the responses of a collaboration of tourism networks regarding the impacts COVID-19 using a longitudinal social network approach. We used a two-wave snowball method to identify potential interviewees and followed geographic and jurisdictional criteria using a face-to-face survey to map collaboration ties between 38 stakeholders involved in whale-watching tourism before and after the second wave of the pandemic. We also asked this group of stakeholders about their perceived impacts of COVID-19. We found slightly higher connectivity and centralization levels in the social networks after the pandemic. Loss of income and reservations, a decrease in both conservations and pollution, and an increase in the reduction in wildlife tourism were the main self-reported impacts. We also detected harmful pandemic legacies, such as whale-watching tours conducted using unregulated private boats. This research directly informs Mexico’s whale-watching tourism policy by showing the management and coordination challenges that stakeholders face in a post-pandemic context. While the social fabric of coastal communities has been resilient to the COVID-19 pandemic, we found indications that the governance of marine resources can easily unravel if rule of law is absent.

AbstractA Pandemic devastates the life of global citizens and causes significant economic, social, and political disruption. Evidence suggests that Pandemic’s likelihood has increased over the past century because of increased global travel and integration, urbanization, and changes in land use. Further, evidence concerning the urban character of the Pandemic has underlined the role of cities in disease transmission. An early assessment of the severity of infection and transmissibility can help quantify the Pandemic potential and prioritize surveillance to control of urban areas in Pandemics. In this paper, an Urban Vulnerability Assessment (UVA) methodology is proposed. UVA investigates the possible vulnerable factors related to Pandemics to assess the vulnerability in urban areas. A vulnerability index is constructed by the aggregation of multiple vulnerability factors computed on each urban area (i.e., urban density, poverty index, informal labor, transmission routes). UVA provides insights into early vulnerability assessment using publicly available data. The applicability of UVA is shown by the identification of high-vulnerable areas where surveillance should be prioritized in the COVID-19 Pandemic in Bogotá, Colombia.

COVID-19 is a terrible virus that has impacted human health and the economy on a global scale. The detection and control of the pandemic have become necessities that require appropriate monitoring strategies. One of these strategies involves measuring and quantifying the virus in water at different stages of the Urban Water Cycle (UWC). This article presents a comprehensive literature review of the analyses and quantifications of SARS-CoV-2 in multiple UWC components from 2020 to June 2021. More than 140 studies worldwide with a focus on industrialized nations were identified, mainly in the USA, Australia, and Asia and the European Union. Wastewater treatment plants were the focus of most of these studies, followed by city sewerage systems and hospital effluents. The fewest studies examined the presence of this virus in bodies of water. Most of the studies were conducted for epidemiological purposes. However, a few focused on viral load and its removal using various treatment strategies or modelling and developing strategies to control the disease. Others compared methodologies for determining if SARS-CoV-2 was present or included risk assessments. This is the first study to emphasize the importance of the various individual components of the UWC and their potential impacts on viral transmission from the source to the public.