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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Abstract. Aromatic hydrocarbons can dominate the volatile organiccompound budget in the urban atmosphere. Among them, 1,2,4-trimethylbenzene(TMB), mainly emitted from solvent use, is one of the most importantsecondary organic aerosol (SOA) precursors. Although atmospheric SO2and NH3 levels can affect secondary aerosol formation, the influencedextent of their impact and their detailed driving mechanisms are not wellunderstood. The focus of the present study is to examine the chemicalcompositions and formation mechanisms of SOA from TMB photooxidationinfluenced by SO2 and/or NH3. Here, we show that SO2emission could considerably enhance aerosol particle formation due toSO2-induced sulfate generation and acid-catalyzed heterogeneousreactions. Orbitrap mass spectrometry measurements revealed thegeneration of not only typical TMB products but also hitherto unidentifiedorganosulfates (OSs) in SO2-added experiments. The OSs designated as being ofunknown origin in earlier field measurements were also detected in TMB SOA,indicating that atmospheric OSs might also be originated from TMBphotooxidation. For NH3-involved experiments, results demonstrated apositive correlation between NH3 levels and particle volume as well asnumber concentrations. The effects of NH3 on SOA composition were slightunder SO2-free conditions but stronger in the presence of SO2. Aseries of multifunctional products with carbonyl, alcohols, and nitratefunctional groups were tentatively characterized in NH3-involvedexperiments based on infrared spectra and mass spectrometry analysis. Plausible formationpathways were proposed for detected products in the particle phase. Thevolatility distributions of products, estimated using parameterizationmethods, suggested that the detected products gradually condense onto thenucleation particles to contribute to aerosol formation and growth. Ourresults suggest that strict control of SO2 and NH3 emissions mightremarkably reduce organosulfates and secondary aerosol burden in theatmosphere. Updating the aromatic oxidation mechanism in models could resultin more accurate treatment of particle formation for urban regions withconsiderable SO2, NH3, and aromatics emissions.

atmospheric chemistry and physics

SO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and NH&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; emissions enhance organosulfur compounds and fine particle formation from the photooxidation of a typical aromatic hydrocarbon