A Lagrangian view on severe haze in Beijing: local and long-range sources of trace gases and primary and secondary aerosols - Benjamin Foreback; Petri Clusius; Metin Baykara; Alexander Mahura; Lukas Pichelstorfer; Carlton Xavier; Putian Zhou; Tom V. Kokkonen; Veli-Matti Kerminen; Yongchun Liu; Men Xia; Xin Chen; et al. (Atmospheric Environment, 2025)