Assertion: Urban waste disposal is a serious problem in India, especially in areas other than metropolitan cities.
Reasoning: In most other cities and towns in the country, about 30 to 50 per cent of the waste generated is left uncollected which accumulates on streets, in open spaces between houses and in wastelands.

Both Assertion (A) and reasoning (R) are correct and R is the correct explanation of A.

Urban waste disposal is a serious problem in India. In metropolitan cities like Mumbai, Kolkata, Chennai, Bengaluru, etc., about 90 per cent of the solid waste is collected and disposed of. But in most other cities and towns in the country, about 30 to 50 per cent of the waste generated is left uncollected which accumulates on streets, in open spaces between houses and in wastelands leading to serious health hazards.