Revisiting nitrous acid (HONO) emission from on-road vehicles: A tunnel study with a mixed fleet

Yutong Liang, Qiaozhi Zha, Weihao Wang, Long Cui, Ka Hei Lui, Kin Fai Ho, Zhe Wang, Shuncheng Lee, Tao Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)


The emission ratio of a modern fleet with a higher percentage of diesel vehicles was measured and the impact of the new emission control technologies on nitrous acid (HONO) were evaluated. The emission ratio measured was approximately 50% higher than the most commonly used 0.8%. Positive correlation between HONO and black carbon (BC) suggests that HONO and BC were emitted together, while the lack of correlation between HONO/NOxand BC, suggests that the BC-mediated conversion of NO2to HONO in the dark was insignificant immediately after emission. Modeling studies handle the BC-mediated HONO formation in the atmospheric chemistry module rather than make correction at the emission source.
Original languageEnglish
Pages (from-to)797-805
Number of pages9
JournalJournal of the Air and Waste Management Association
Issue number7
Publication statusPublished - 3 Jul 2017

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law


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