A cross-cultural study that examined helping behaviors in 23 large cities around the world found that, in general, people in Rio de Janeiro were most helpful and people in Kuala Lampur were least helpful. From these findings, we know that

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.