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

. NH3 is the most important alkaline gas in the atmosphere and one of thekey species affecting the behaviors of atmospheric aerosols. However, theimpact of NH3 on secondary organic aerosol (SOA) formation remainspoorly understood, especially the dynamic evolution of chemical compositionsin the SOA formation process. In this study, a series of chamber experimentswere performed to probe the individual and common effects of NH3 andNOx on toluene SOA formation through OH photooxidation. The chemicalcompositions of toluene SOA were characterized using the Aerodynehigh-resolution time-of-flight aerosol mass spectrometer (AMS). The SOAyield increased from 28.1 % in the absence of NH3 to 34.7 % in thepresence of NH3 but decreased to 19.5 % in the presence of NOx.However, the highest SOA yield of 42.7 % and the lowest carbon oxidationstate (OSC) occurred in the presence of both NH3 and NOx,indicating that the higher-volatility products that formed in the presenceof NOx could partition into the particle phase when NH3 was added.This resulted in a synergetic effect on SOA formation when NH3 andNOx co-existed. The heterogeneous reaction was the main pathway bywhich NH3 participated in SOA formation in the photooxidationprocess. The synergetic effect of NH3 and NOx was also observed inSOA optical absorption. A peak at 280 nm, which is characteristic oforganonitrogen imidazole compounds, was observed in the presence of NH3,and its intensity increased when NOx was added into the chamber. Thiswork improves our understanding of how the synergistic interactions betweenNH3 and NOx influence SOA formation and offers new insights intomitigating haze pollution.

atmospheric chemistry and physics

Synergetic effects of NH&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; and NO&amp;lt;sub&amp;gt;&amp;lt;i&amp;gt;x&amp;lt;/i&amp;gt;&amp;lt;/sub&amp;gt; on the production and optical absorption of secondary organic aerosol formation from toluene photooxidation