Reduction in anthropogenic emissions suppressed new particle formation and growth: Insights from the COVID-19 lockdown

To control the spread of the novel 2019 Coronavirus (COVID-19), the Government of India enforced nationwide social and transportation restrictions (lockdown) in three phases from the evening of 24 March to 31 May 2020, which resulted in a significant reduction of primary emissions. Here, we performed the analyses of particle number size distribution measurements in the particle size range of 1.2-3 nm and 10-514 nm carried out from 15 April to 31 May 2020 (lockdown, LCD) and compared with measurements from the previous year during the same time period (15 April to 31 May 2019, business-as-usual, BAU) at University of Hyderabad in Hyderabad, India. The number concentrations of sub-3nm particles were comparable between LCD and BAU, but the number concentrations of particles greater than 10 nm diameter were lower by about 85% during LCD than BAU. It indicates that the reduction in primary anthropogenic emissions did not inhibit the formation of sub-3nm particles. But the frequency of occurrence of the new particle formation and growth (NPF&G) events was three-fold lower during LCD than BAU. The ratio of formaldehyde to nitrogen dioxide indicated that India falls in a NOx-limited regime, which reduces ambient ozone concentrations (lower condensable vapors via ozone oxidation of volatile organic compounds). Besides, the lower temperature (lower hydroxyl radical concentration) and lower wind speed during LCD may have contributed to the suppression of NPF&G events. Therefore, we emphasize the need to account for processes and interactions related to NPF&G in formulating particulate pollution mitigation policies in urban environments. This article is protected by copyright. All rights reserved.

Review on origin and concatenation of covid-19

Since 2019-November on world facing whole world is facing an unprecedented health problem. The WHO has said that a pandemic infection are coming with a new virus species of coronavirus is called SARS-CoV-2. Coronavirus 2019 is associated with global health and acute coronary respiratory syndrome coronavirus-2. COVID-19 is widely spread through drip channels. The virus causes mild symptoms in many who have manifested many symptoms, dry cough, fatigue, muscle aches and bruises;Common symptoms include diarrhea, colds, hemoptysis, sore throat and runny nose. Severe infections, which are the main treatment options for critical care patients, include severe lung burns, sepsis, ARDS and septicemia. Here we present nine key research questions related to virus infection, releasing anonymous, treatment, pre-symptomatic viruses, diagnosis, vaccine growth, origins of the virus and also viral infections, etiology, viral infections, clinical picture, treatment and infection. Effective treatment is not yet available. Every day there is an increase in morbidity and mortality, and adherence to the instructions of infection prevention and infection should control government organizations are the basis to the fight against viruses.