<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Tang, L.</style></author><author><style face="normal" font="default" size="100%">Shang, D.</style></author><author><style face="normal" font="default" size="100%">Fang, X.</style></author><author><style face="normal" font="default" size="100%">Wu, Z.</style></author><author><style face="normal" font="default" size="100%">Y. Qiu</style></author><author><style face="normal" font="default" size="100%">S. Chen</style></author><author><style face="normal" font="default" size="100%">X. Li</style></author><author><style face="normal" font="default" size="100%">Zeng, L.</style></author><author><style face="normal" font="default" size="100%">Guo, S.</style></author><author><style face="normal" font="default" size="100%">Hu, M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">More Significant Impacts From New Particle Formation on Haze Formation During COVID-19 Lockdown</style></title><secondary-title><style face="normal" font="default" size="100%">Geophysical Research LettersGeophysical Research LettersGeophysical Research Letters</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Geophys. Res. Lett.</style></alt-title><short-title><style face="normal" font="default" size="100%">Geophys. Res. Lett.Geophys. Res. Lett.</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Beijing [China]</style></keyword><keyword><style  face="normal" font="default" size="100%">concentration (composition)</style></keyword><keyword><style  face="normal" font="default" size="100%">COVID-19</style></keyword><keyword><style  face="normal" font="default" size="100%">Earth sciences</style></keyword><keyword><style  face="normal" font="default" size="100%">Emission control</style></keyword><keyword><style  face="normal" font="default" size="100%">formation rates</style></keyword><keyword><style  face="normal" font="default" size="100%">Geophysics</style></keyword><keyword><style  face="normal" font="default" size="100%">haze</style></keyword><keyword><style  face="normal" font="default" size="100%">haze formation</style></keyword><keyword><style  face="normal" font="default" size="100%">industrial emission</style></keyword><keyword><style  face="normal" font="default" size="100%">Industrial emissions</style></keyword><keyword><style  face="normal" font="default" size="100%">nanoparticle</style></keyword><keyword><style  face="normal" font="default" size="100%">new particle formation</style></keyword><keyword><style  face="normal" font="default" size="100%">Particle number size distribution</style></keyword><keyword><style  face="normal" font="default" size="100%">particulate matter</style></keyword><keyword><style  face="normal" font="default" size="100%">PM2.5 concentration</style></keyword><keyword><style  face="normal" font="default" size="100%">Pollution mitigation</style></keyword><keyword><style  face="normal" font="default" size="100%">Potential impacts</style></keyword><keyword><style  face="normal" font="default" size="100%">Primary emissions</style></keyword><keyword><style  face="normal" font="default" size="100%">size distribution</style></keyword><keyword><style  face="normal" font="default" size="100%">urban area</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2021</style></year></dates><number><style face="normal" font="default" size="100%">8</style></number><volume><style face="normal" font="default" size="100%">48</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">During the COVID-19 lockdown in 2020, large-scale industrial and transportation emissions were reduced, but high PM2.5 concentration still occurred. This study investigated the variation of particle number size distribution during the lockdown, and analyzed the characteristics of new particle formation (NPF) events and its potential impact on haze formation. Through measurement conducted in urban Beijing during the first 3 months of 2020, and comparison with year-over-year data, the decrease of primary Aitken-mode particles was observed. However, frequencies, formation rates and growth rates of NPF events remained stable between 2020 and 2019 in the same period. As a result, &amp;amp;gt;25 nm particles produced by NPF events, would play a more important role in serving as the haze formation “seeds” compared to those produced by primary emissions. This finding emphasizes the significance on the understanding of NPF mechanisms when making pollution mitigation policy in the future. © 2021. The Authors.</style></abstract><work-type><style face="normal" font="default" size="100%">Article</style></work-type><notes><style face="normal" font="default" size="100%">Export Date: 7 June 2021</style></notes><custom7><style face="normal" font="default" size="100%">e2020GL091591</style></custom7><remote-database-name><style face="normal" font="default" size="100%">Scopus</style></remote-database-name></record></records></xml>