Which is not a source of air pollution?

Given below are two statements. One of them is labelled as Assertion (A} and the other as Reason (R}. Choose the correct answer with the help of code given below :
Assertion (A} : Never sleep in a room with burning or smouldering coal fire in it. Reason (R} : Incomplete combustion leads to production of Carbon Monoxide gas, which may lead to death of people sleeping in the room.

​Smoke goes up because:​

​Damaged fluorescent tubes or CFLs need to be disposed off safely because:​

Mohan went to a cafe and ordered a soft drink. The waiter brought his order in a plastic glass with a plastic straw. Mohan, being environment friendly, is not happy as: