Air pollution recovery still falls short of pre-industrial conditions: sulfur stable isotope analysis of tree rings from two giant trees. - Shiode, Ayumi; Nakatsuka, Takeshi; Kato, Yoshikazu; Sase, Hiroyuki; Morohashi, Masayuki; Ishida, Takuya; Hirano, Yasuhiro; Tanikawa, Toko (Biogeochemistry, 2025)