increased ozone concentration at ground level is damaging crops worth millions of dollars in the uk. Lisa Emberson of the Switzerland-based Stockholm Environment Institute recently developed a method to calculate the amount of ozone that crops absorb, taking into account species-specific data and environmental conditions (such as the growing season, drought and humidity). These factors, in combination with ozone concentrations, determine a plant's survival rate. Calculations made for the uk show that damages to two staple crops