Good environmental health leads to good human health, which is why air quality is a key environmental issue in the current scientific research. At present, social concern is great, and a significant effort is being made to improve air quality through legislation for emissions reduction. In addition to the negative effects on human health, air quality changes are responsible for different responses of the urban fabric, such as modifications of the biology and weathering of building materials (including soiling and discoloration). This Special Issue invites contributions from researchers across the globe to suggest, discuss, and address some effects associated with air quality changes in different areas at the municipal, regional, state, national, and global levels. The topics of interest include but are not limited to: Green policies related to air quality; Record changes in air quality due to the Covid-19 crisis; Record changes in air quality due to global change; Current air quality changes in the context of smart cities; Patterns and drivers on built structures to the understanding of air quality change.
Keywords: Air pollution; Bioindicators; Biomonitoring; Building maintenance; Cultural heritage; Green policies; Records; Smart cities; Temporal trends; Urban fabric.