Continuing a trend observed in 2024 and prior years, the highest population-weighted national annual average PM2.5 concentrations remain concentrated within Africa and the Central and South Asia regions. Africa's representation in the data has expanded significantly this year with the inclusion of seven countries and territories not present in last year's Report: Guinea, Eswatini, Tanzania, Benin, Morocco, the Canary Islands, and Réunion. While this expanded data set is a positive step, continued efforts are essential to build out monitoring networks that can more accurately reflect the lived air quality experiences of these populations. In total, this Report features 7 new countries. This growth is driven primarily by Africa (seven new entries), followed by West Asia with three, and Oceania and Europe with one each. On a positive note, 13 countries globally reported annual average concentrations below 5 μg/m3, successfully meeting the WHO air quality guidelines. The majority of these nations are located within Latin America & Caribbean as well as Oceania regions.