Although air pollution is an important environmental concern in tourism, it is rarely studied in the field of sustainable tourism. Thus, we investigated how air pollution influences tourists' pro-environmental behavioral intentions (TPEBIs) through two laboratory experiments (studies 1 and 2) and one field study (study 3). Study 1 (n = 104) revealed the negative influence of air pollution on TPEBIs, both explicitly and implicitly. Study 2 (n = 108) further explored the mediating effect of state anxiety on the relationship between air pollution and TPEBIs. Furthermore, study 3 (n = 350) investigated a real sample of traveling tourists. Study 3's results confirmed the laboratory findings of studies 1 and 2, indicating the buffering effect of tourism nostalgia (i.e., a moderated mediation model) in a real traveling context. These findings advance the understanding of air pollution's impact on TPEBIs and can serve as practical advice for sustainable tourism management. © 2018 Elsevier B.V.