Ozone History | Ozone in the Troposphere | Ozone in the Stratosphere | History Effects Ozone | Ozone’s Other Uses
Lower troposphere ozone impacts human health, crops, forests and natural ecosystems, so there is effort to keep the ozone levels at a minimum. Both industrialized and developing countries have been found to have potentially harmful levels of ozone. Since the 1970’s there has been a constant increase in ozone concentration, raising concerns. Ozone irritates eyes and nasal passages, and people with asthma or heart disease are especially susceptible to the negative effects. If one is exposed to ozone levels at .3 ppm for one to two hours, fatigue and respiratory difficulties result. Ozone is also very poisonous to plants, especially leafy ones like tobacco and tomatoes. It reduces photosynthesis, which causes leaves to turn yellow.
�