Over 250 fogging machines of Dhanbad Municipal corporation are lying unused at a time when its residents are facing the outbreak of various mosquito-borne diseases like dengue and malaria. Concerned over the issue, Madhurendra Singh, former president of Bartand Chamber of Commerce and a civil rights activist, on Tuesday wrote to municipal commissioner Satyendra Kumar, demanding immediate resumption of fogging services in all 55 wards of the district. Around 12 bike-mounted and over 225 portable machines are lying defunct due to the lack of use and proper maintenance, Singh told The Telegraph Online. “I have also drawn the attention of the Municipal Commissioner towards the fact that during the pandemic expired chemicals were used for fogging. As a consequence the grind was ineffective in yielding the desired result. It merely generated smoke,” he added.