TY  - JOUR 
AU  - Martín Valmayor, Miguel Ángel
AU  - Infante, Juan
AU  - Carmona-González, Nieves
AU  - Gil Alana, Luis A.
PY  - 2026
SN  - 2590-2520
UR  - https://hdl.handle.net/20.500.12766/910
AB  - This article presents new evidence on the persistence, seasonality, and trends of fine particulate matter (PM2.5) Air Quality Index (AQI) across twenty global megacities from January 2014 to January 2026. The research applies a fractional integration...
LA  - eng
PB  - Elsevier
TI  - PM 2.5 air quality index in major cities. long memory analysis with fractional integration
DO  - 10.1016/J.CACINT.2026.100492
T2  - City and Environment Interactions
M2  - 100492
VL  - 32
ER  -