English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. Atmospheric furan is a primary and secondary pollutant inthe atmosphere, and its emission contributes to the formation of ultrafineparticles. We investigate the effects of NOx level and humidity on theformation of secondary organic aerosol (SOA) generated from thephotooxidation of furan in the presence of NaCl seed particles. SOA massconcentration and yield were determined under different NOx and humiditylevels. A significant difference is observed both in the variation of SOAmass concentration and SOA yield with the initial experimental conditions.Varying VOC (volatile organic compound) ∕ NOx ratios over the range 48.1 to 8.2 contributes to theeffective formation of SOA in the presence of NaCl seed particles, with theSOA mass concentration and SOA yield ranging from 0.96 to23.46 µg m−3 and from 0.04 % to 1.01 %, respectively. Wefound that there was a favourable relationship between the SOA yields andNOx concentration. In particular, the increase in SOA yield with increasing NOxconcentration was continuously observed at high NOx levels owing to acorresponding increase in the amount of low-volatility hydroxyl nitrates anddihydroxyl dinitrates that can partition into the particle phase. In addition,varying relative humidity (RH) from 5 % to 88 % increased the SOA yield from 1.01 % to5.03 %. The enhanced SOA formation from humid conditions may result fromthe high OH concentration, rapid furan decay rate, enhanced carbonyl-richproducts condensation, and the aqueous-phase reactions. Using hybridquadrupole-orbitrap mass spectrometer equipped with electrospray ionization(HESI-Q Exactive-Orbitrap MS), three carbonyl-rich products and three kindsof organonitrates were identified in the collected SOA. Based on the HESI-Q Exactive-Orbitrap MS analysis and Fourier transform infrared spectroscopy (FTIR), the reaction mechanism of furan photooxidationwas proposed. This study demonstrates the effects of NOx and humidity on SOAformation during the furan–NOx–NaCl photooxidation and provides newinsights into the oxidation regime and SOA composition in furanphotooxidation. The results also illustrate the importance of studying SOAformation over a comprehensive range of environmental conditions. Only suchevaluations can induce meaningful SOA mechanisms to be implemented in airquality models.

atmospheric chemistry and physics

Secondary organic aerosol formation from photooxidation of furan: effects of NO&amp;lt;sub&amp;gt;&amp;lt;i&amp;gt;x&amp;lt;/i&amp;gt;&amp;lt;/sub&amp;gt; and humidity