This paper aims to review relevant literature published up to April 2018 for determining whether air pollution caused by ambient gaseous (NO<sub>2</sub>, SO<sub>2</sub>, PCDD/Fs, Benzene) and particulate matters (PM<sub>10</sub>, PM<sub>2.5</sub>, PM<sub>7</sub>, PAH, BC/EC) as an environmental risk factor is associated with increased risk of ADHD in children.