Question

what are some challenges that we face when aiming to keep a big and overcrowded city clean?

Answer 1

we face many challenges when we are among a big and overcrowded city as the level of competition increases and health also gets affected due to polluting .
Overcrowded placed leads to transfer of diseases.

Answer 2

We face the problem of
a. Population density
b. The non corporative people oppose
c. Corrupt officers bad job
d. The less no of workers.