Dhaka, Jan. 11 -- Faulty drainage and waste management systems along with poor monitoring from the authorities concerned are among the major causes of the high density of Culex mosquitoes in Dhaka that puts the urban health at risk.

The density of Aedes mosquitoes is on the decline, mainly due to the temperature drop in the winter. The Aedes mosquitoes would return with the temperature rise and monsoon rains, they added.

This situation makes the mosquito menace a permanent problem for the city, putting its urban management system and administrative capacity in question.

Prof. Kabirul Bashar, a medical entomologist and teacher of Jahangirnagar University, told the FE that the high density of Culex mosquitoes would be at peak in March. T...