Helping a billion people breathe cleaner air

The problem: Air pollution is a global public health crisis and the fourth leading cause of death globally. Nine out of 10 people around the world breathe unhealthy air, and burning fossil fuels is both the largest source of air pollution and the biggest cause of climate change.

What we’re doing about it: We’re working to help 1 billion people breathe cleaner air in this decade. By pinpointing local pollution in countries around the world, we’re giving policymakers, community groups and the private sector the tools they need to reduce pollution and hold polluters accountable.