Investigation of the vertical distribution of formaldehyde and its implications for hydroxyl radical contribution and ozone formation sensitivity in Ningbo, China - Qianqian Hong; Xiaojian Zhang; Chengzhi Xing; Baixue Yang; Jingyi Chen; Shaocong Wei; Hua Lin; Yizhi Zhu; Jian Mei; Mao Mao; Cheng Liu (Journal of Environmental Sciences, 2026)