Fig. 2

Associations of air pollutants (O₃, NO₂, O_X and O_x^wt) with emergency room visits for respiratory diseases stratified by age at lag 05 day during 2014–2019. NOTE: O₃, ozone; NO₂, nitrogen dioxide; O_X, oxidant capacity; O_x^wt, redox-weighted oxidant capacity; TRD, total respiratory disease; AURI, acute upper respiratory infection; LRTI, lower respiratory tract infection.^*P for subgroup differences < 0.05 compared with the group aged 18–64 years