Baikunthpur Municipality in Korea have started to use whistles as an alternative to knocking on doors to alert the neighbourhood to bring out their garbage.
According to a sanitation worker, whistling is a more efficient and simple process than the previous door-to-door method.
While speaking to ANI, Baikunthpur Municipal Commissioner Jyotsna Toppo said, "They collect garbage from door to door.
Then bring it to the centre where it is segregated.
Saleable material is sold and waste is converted into compost.
Earlier they did not step out of their homes but now they earn Rs 6000 per month."