Annual outdoor air quality funding worldwide 2015-2021
International development funders committed approximately 17.5 billion U.S. dollars to projects focussed on tackling outdoor air pollution between 2015 and 2021. This accounted for just one percent of total international development funding during this period. The highest funding in this six-year period was in 2019, at 4.8 billion U.S. dollars. Funds plummeted the following year, likely due to the COVID-19 pandemic, but rebounded 35 percent in 2021.