Every US$1 invested in tackling climate change and air pollution together can generate around US$15 in economic benefits, according to a report released by the UN Environment Programme (UNEP) and the Climate and Clean Air Coalition on 7 September 2026, the International Day of Clean Air for Blue Skies. The assessment, titled “Hidden assets: The economic and health case for climate and clean air action,” is described by UNEP as the first comprehensive global economic assessment of integrated climate and clean-air action.
Where the returns come from
Counting only direct market gains, such as lower healthcare costs and higher workforce productivity, the report estimates a return of around $4 for every $1 spent. The fuller 15-to-1 estimate also factors in avoided climate-related damage and the economic value of preventing premature deaths and improving health, which UNEP says makes coordinated action significantly more cost-effective than tackling climate change and air pollution as separate problems.
Twenty-five measures, modest cost
The assessment sets out 25 proven measures and policy reforms, including expanding renewable energy, electric vehicles and clean cooking fuels, that it says could deliver these gains. Implementing the full package is estimated to cost about 0.7 percent of global GDP over the coming decade, declining to around 0.5 percent by the end of the century as clean technologies become cheaper.
Why It Matters
Climate policy and air-quality policy have often been pursued through separate government departments and budgets, even though many of the same measures, such as shifting away from fossil fuels, address both problems at once. A report quantifying the combined economic case is aimed at governments weighing where to direct limited public spending, making the argument that treating clean air and climate as one problem, not two, produces a far stronger return and a faster path to convincing finance ministries to act.
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