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10.1016/j.envres.2020.110603 http://scihub22266oqcxt.onion/10.1016/j.envres.2020.110603 33307081!7833947!33307081     free     free     free Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=33307081&cmd=llinks): Failed to open stream: HTTP request failed! 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On the concentration of SARS-CoV-2 in outdoor air and the interaction with pre-existing atmospheric particles |pdf=|usr=}}{{33307081}} gab.com Text On the concentration of SARS-CoV-2 in outdoor air and the interaction with pre-existing atmospheric particles JO: Environ Res http://www.kidney.de/pget.php?&tw=1&pmid=33307081 #FOAvip The spread of SARS-CoV-2 by contact (direct or indirect) is widely accepted, but the relative importance of airborne transmission is still controversial. Probability of outdoor airborne transmission depends on several parameters, still rather uncertain: virus-laden aerosol concentrations, viability and lifetime, minimum dose necessary to transmit the disease. In this work, an estimate of outdoor concentrations in northern Italy (region Lombardia) was performed using a simple box model approach, based on an estimate of respiratory emissions, with a specific focus for the cities of Milan and Bergamo (Italy). In addition, the probability of interaction of virus-laden aerosol with pre-existing particles of different sizes was investigated. Results indicate very low (<1 RNA copy/m(3)) average outdoor concentrations in public area, excluding crowded zones, even in the worst case scenario and assuming a number of infects up to 25% of population. On average, assuming a number of infects equal to 10% of the population, the time necessary to inspire a quantum (i.e. the dose of airborne droplet nuclei required to cause infection in 63% of susceptible persons) would be 31.5 days in Milan (range 2.7-91 days) and 51.2 days in Bergamo (range 4.4-149 days). Therefore, the probability of airborne transmission due to respiratory aerosol is very low in outdoor conditions, even if it could be more relevant for community indoor environments, in which further studies are necessary to investigate the potential risks. We theoretically examined if atmospheric particles can scavenge virus aerosol, through inertial impact, interception, and Brownian diffusion. The probability was very low. In addition, the probability of coagulation of virus-laden aerosol with pre-existing atmospheric particles resulted negligible for accumulation and coarse mode particles, but virus-laden aerosol could act as sink of ultrafine particles (around 0.01 mum in diameter). However, this will not change significantly the dynamics behaviour of the virus particle or its permanence time in atmosphere. Twit Text FOAVip On the concentration of SARS-CoV-2 in outdoor air and the interaction with pre-existing atmospheric particles ????Environ Res http://www.kidney.de/pget.php?&tw=1&pmid=33307081 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=33307081 #FOAvip English Wikipedia <ref>{{Cite pmid|33307081}}</ref> On the concentration of SARS-CoV-2 in outdoor air and the interaction with pre-existing atmospheric particles #MMPMID33307081 Belosi F; Conte M; Gianelle V; Santachiara G; Contini D Environ Res 2021[Feb]; 193 (ä): 110603 PMID33307081show ga The spread of SARS-CoV-2 by contact (direct or indirect) is widely accepted, but the relative importance of airborne transmission is still controversial. Probability of outdoor airborne transmission depends on several parameters, still rather uncertain: virus-laden aerosol concentrations, viability and lifetime, minimum dose necessary to transmit the disease. In this work, an estimate of outdoor concentrations in northern Italy (region Lombardia) was performed using a simple box model approach, based on an estimate of respiratory emissions, with a specific focus for the cities of Milan and Bergamo (Italy). In addition, the probability of interaction of virus-laden aerosol with pre-existing particles of different sizes was investigated. Results indicate very low (<1 RNA copy/m(3)) average outdoor concentrations in public area, excluding crowded zones, even in the worst case scenario and assuming a number of infects up to 25% of population. On average, assuming a number of infects equal to 10% of the population, the time necessary to inspire a quantum (i.e. the dose of airborne droplet nuclei required to cause infection in 63% of susceptible persons) would be 31.5 days in Milan (range 2.7-91 days) and 51.2 days in Bergamo (range 4.4-149 days). Therefore, the probability of airborne transmission due to respiratory aerosol is very low in outdoor conditions, even if it could be more relevant for community indoor environments, in which further studies are necessary to investigate the potential risks. We theoretically examined if atmospheric particles can scavenge virus aerosol, through inertial impact, interception, and Brownian diffusion. The probability was very low. In addition, the probability of coagulation of virus-laden aerosol with pre-existing atmospheric particles resulted negligible for accumulation and coarse mode particles, but virus-laden aerosol could act as sink of ultrafine particles (around 0.01 mum in diameter). However, this will not change significantly the dynamics behaviour of the virus particle or its permanence time in atmosphere. |*COVID-19[MESH] |*SARS-CoV-2[MESH] |Aerosols[MESH] |Cities[MESH] |Humans[MESH]On the concentration of SARS-CoV-2 in outdoor air and the interaction (epmc).pdf DeepDyve Pubget Overpricing