The Case for Action on Tropospheric Ozone

This report highlights the importance of reducing Tropospheric Ozone - a greenhouse gas, super pollutant and air pollutant that is all around us. As a greenhouse gas, it is responsible for approximately 0.23°C of present-day warming. Yet dedicated action to reduce tropospheric ozone is absent from the climate policy agenda at a global, regional, and country level. Cutting tropospheric ozone presents a unique challenge as it requires smart and fast action across multiple greenhouse gases and air pollutants, as well as multiple economic sectors at a local and global level. Along with recommendations, this briefing also showcases efforts in cities and regions – including Los Angeles, Mexico City, Beijing and Europe – that have successfully reduced levels of tropospheric ozone through targeted pollution control.