Nigeria home to the world's most polluted city

  • According to data released by the World Health Organization, Nigeria is home to four of the world’s worst cities for air pollution. When measuring small particulate matter concentration, Onitsha has the distinction of being the most polluted city in the world for air quality. The other three cities include, Kaduna, which came fifth, Aba, which stood on the sixth position and Umuahia, at the 16th position.