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Tropospheric ozone (O₃) phytotoxicity is a major threat to agricultural production leading to global yield loss of about 3.9–15% for wheat, 8.5–14% for soybean and 2.2–5.5% for maize. At a global scale, the United States displays a decline in O₃ level of about 17% from 2000–2015. O₃ concentration in the United States is about two times higher than that of Europe. Despite the declining trend in these two continents, the prevailing concentrations are still high enough to affect the plant growth and productivity. Beside this, a significant rise in O₃ pollution is observed in various Asian countries. China, the fastest developing nation of Asia, has shown an increase of surface O₃ concentration by 0.58 ppbv/yr. from 1994 to 2007. A continuous increase in the emission of O₃ precursors in southern and central Asia has been reported due to weaker legislative policies in the developing countries, contributing to more O₃ …