Biwu Chu

3 weeks ago | nature.com | Yongchun Liu |Wei Ma |Weigang Wang |Men Xia |Biwu Chu |Wei Du | +4 more

AbstractHeterogeneous reactions of NO2 on particulate matter have been considered an important source of HONO (Nitrous acid) in the troposphere, whereas its contribution is controversial due to the lack of uptake coefficient of NO2 (γNO2) on the surfaces of ambient particulate matter (PM). Here we investigate the the γNO2 to form HONO and its evolution based on long-term comprehensive field observations (2019–2023) in Beijing and a random forest model with Shapley additive explanations.