Ground-level ozone – which is produced by chemical reactions between air pollutants in the presence of sunlight – reduces crop growth and agricultural productivity. Two of the world’s most important staple crops, wheat and soybean, are particularly sensitive to the effects of ozone. Globally, ozone pollution has been estimated to cause more than $11 billion worth of crop damage every year. 92% of the global population live in places with unhealthy air quality. Air pollution comes from many sources: Inefficient transport, coal-fired power plants, industrial activity, waste burning and other human activities are major sources