This paper covers the current state

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The complexity of the building environment directly affects the spread of the SARS-CoV-2 inside the building. Therefore, the paper systematically reviewed the effective and feasible measures, designs and relevant epidemic prevention guidelines formed in the eld of epidemic prevention during the period of COVID-19, as well as the excellent research and projects around the world. The study found that most of the people infected with COVID-19 were infected indoors, but the current building design was not included in the scope of epidemic prevention design, not effectively resist the spread of infectious diseases, and there is no standard guideline for epidemic prevention building design so far. Therefore, it is necessary to formulate building epidemic prevention standards, and by considering the epidemic prevention design in the architectural planning and design stage, the use of building epidemic prevention products, healthy wind environment design, etc. to establish a healthy building environment can effectively reduce the risk of epidemic transmission inside the building. However, due to insufficient epidemiological data and pathological research on the risk of epidemic transmission among residents, further research on the standards for epidemic prevention and quantitative risk assessment methods of building is limited.

This paper summarizes the results of several stormwater research projects that investigated particulate pollutant strengths for different particle size ranges. This paper builds on the previous paper simultaneously published describing particle size distributions of stormwater particulates (Pitt et al. 2016). The pollutant strength information presented in this paper, along with the particle size distribution in the other paper, is critical when understanding the routing of stormwater particulates through urban systems and especially when calculating the expected performance of stormwater controls. The pollutant concentrations commonly have a bimodal distribution, with higher values for small particles (due to large surface areas) and sometimes for large particles (such as for polycyclic aromatic hydrocarbons, PAHs, that are strongly associated with large organic debris). In most cases, the majority of the stormwater pollutant masses at outfalls are associated with small and moderate-sized particulates (usually from ~10 µm to 200 µm) which are effectively transported through drainage systems. Stormwater controls that focus on larger particles (such as >300 µm) that are more abundant at source areas may have less effective benefits on discharged stormwater quality as they only contribute small fractions of the total particulate mass after being poorly transported through most drainage systems. Treatability tests show that effective removal of particulate-bound stormwater pollutants requires the control of the small particles, usually down to ~10 µm in size. Pre-treatment stormwater controls that focus on larger particles reduce maintenance issues and provide other benefits, but need to be supplemented with additional controls that are effective in the removal of small particles, usually in a treatment train arrangement.

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