Ozone is one of the most harmful air pollutants. The concentration of atmospheric ozone has increased since the middle of 19th century and will continue to rise for at least the next 50100 years. Elevated ozone concentration affects plant physiology, signalling among plant cells, and production of plant volatiles to different degrees, and threatens crop yields. The preference, behaviour, growth, and development of insect herbivores are impacted due to the changes in plant primary and secondary metabolism brought about by elevated ozone concentration. Elevated ozone concentration influences insect behaviours by changing semiochemicals. Consequently interactions between herbivores and the next trophic levels are greatly affected. The effect of elevated ozone concentration on plants and insects is summarized based on domestic and foreign research reports. Methological problems associated with research in this area are discussed and our own perspective on future research is provided.