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Topic Review
Wastewater Treatment in Developing Nations
Water is the founding fundamental of life and hence is a basic need of life. Due to poor water quality and sanitation problems, most health issues are caused by water-borne infections. In developing countries, untreated wastewater is released into water bodies or the ground, thereby polluting natural resources. This is due to the lack of sufficient infrastructure, planning, funding, and technologies to overcome these problems. Additionally, the urbanization of megacities in developing countries is highly accelerated, but it is disproportionate to the required resources for treating wastewater. 
  • 605
  • 31 Aug 2022
Topic Review
Radon Risk Perception, Awareness and Knowledge
Radon is a natural radioactive gas that is present in buildings and is the second cause of lung cancer after smoking. Risk perception has been studied from multiple perspectives, including social studies, anthropology, and medical disciplines, with psychology playing a primary role. Two main dimensions are involved in risk perception: a cognitive dimension, related to knowledge and understanding of risk, and an emotional dimension, which includes feelings; both are components of the reaction to risks, representations of immediate and/or future consequences and their implications, and how people decide how to behave accordingly. Perceived risk is therefore quantifiable and predictable: the psychometric paradigm has helped to clarify how certain elements and characteristics are specifically influential in people’s perception of the dangerousness of an activity, such as controllability, voluntariness, threat to future generations, and responsibility. The research for the implementation of evidence-based radon communication programs is progressing rapidly. Many countries have issued regulations or recommendations to ensure that radon concentration levels do not exceed certain threshold values. Following the results of numerous epidemiological studies conducted two decades earlier, in 2009 the World Health Organization proposed a reference level of 100 Bq m−3 to minimize health risks from indoor radon, adding that if this level could not be achieved due to country-specific conditions, the chosen reference level should not exceed 300 Bq m−3. According to the 2013 Euratom Directive, radon is an indoor pollutant monitored in workplaces and homes, with established limits and exposure control obligations but exposure continues to be very high in some situations.
  • 408
  • 31 Aug 2022
Topic Review
PM0.1 in Southeast Asian Cities
PM0.1 (particles with a diameter ≤ 0.1 µm), nanoparticles (NPs), or ultrafine particles (UFPs) were interchangeably used in the scientific communities. PM0.1 originated from both natural and human sources.
  • 763
  • 30 Aug 2022
Topic Review
Building-Integrated Photovoltaics in Singapore
Building-integrated photovoltaics (BIPVs) represent an effective technology to attain zero energy buildings (ZEBs) via solar energy use. A BIPV system can seamlessly integrate PV modules into external building surfaces, such as walls, roofs, shading devices, and decorative components. Moreover, it can generate clean energy. From an environmental and economic perspective, PV energy generation provides more advantages than fossil fuel-based energy generation. First, in contrast to the limited storage of fossil fuels, the solar radiation reaching the Earth’s surface every day contains 10,000 times the energy requirements of humans on a daily basis. Second, the manufacturing process of PV modules produces only a small amount of carbon dioxide (20–30 g carbon dioxide equivalent (CO2e/kWh)).
  • 1.9K
  • 30 Aug 2022
Topic Review
Microalgae-Based Biorefineries: Challenges and Future Trends
Microalgae-based biorefineries allow the simultaneous production of microalgae biomass enriched in a particular macromolecule and high-added and low-value products if a proper selection of the microalgae species and the cultivation conditions are adequate for the purpose. 
  • 1.1K
  • 30 Aug 2022
Topic Review
Methods for Removal of Ceftriaxone from Wastewater
Ceftriaxone is a type of antibiotic used to treat a variety of bacterial illnesses. The presence of pharmaceuticals in surface water and wastewater poses a threat to public health and has significant effects on the ecosystem. Since most wastewater treatment plants are ineffective at removing molecules efficiently, some pharmaceuticals enter aquatic ecosystems, thus creating issues such as antibiotic resistance and toxicity. 
  • 689
  • 29 Aug 2022
Topic Review
Release of Microplastics from Masks
The global panic caused by COVID-19 has continued to increase people’s demand for masks. Due to inadequate management and disposal practice, these masks have entered the environment and release a large amount of microplastics (MPs), posing a serious threat to the environment and human health. 
  • 729
  • 29 Aug 2022
Topic Review
Mercury in the Southern Hemisphere
Mercury is a toxic pollutant that can negatively impact the population’s health and the environment. The research on atmospheric mercury is of critical concern because of the diverse process that this pollutant suffers in the atmosphere as well as its deposition capacity, which can provoke diverse health issues.
  • 384
  • 26 Aug 2022
Topic Review
The Interaction between Urban and Rural Areas
The relationships and interactions between rural and urban spaces have long been of interest to territorial sciences. However, approaches to these issues have evolved in line with the changing characteristics of the two types of territories, reflecting new relationships and structures. 
  • 974
  • 26 Aug 2022
Topic Review
Food Waste and Circular Economy
The world’s population is expected to grow at an increasing rate, leading to increased food consumption and waste production. Even though food waste represents one of the most challenging economic and environmental issues of the 21st century, it also provides a vast array of valuable resources. Eight broad themes emerged in circular economy: (1) anaerobic digestion of food waste for circular economy creation; (2) food waste systems and life cycle assessments for circular economy; (3) bio-based circular economy approaches; (4) consumer behavior and attitudes toward circular economies; (5) food supply chains and food waste in a circular economy; (6) material flow analysis and sustainability; (7) challenges, policies, and practices to achieve circularity; and (8) circular economy and patterns of consumption. 
  • 542
  • 25 Aug 2022
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