Ahmad Jonidi Jafari, has got his Ph.D degree in Environmental health engineering from Brunel University, London, UK. He is professor of Environmental health at Iran University of medical sciences, Tehran, Iran. Already, he was associate professor in Hamadan University of Medical Sciences, Hamadan, Iran and Tarbiat Modares University, Tehran, Iran. He is head of Environmental and occupational center in minstery of Health, Iran His main interests are in Environmental health issues, Air pollution, Industrial wastewater and waste treatment and occupational health issues.