Question

According to how the other half lives, what was the problem with only having the stairs and the hallway door for fresh air in buildings in the slums?

Answer 1

Answer:

The air was stale and hot

Explanation:

At that time, there were no regulations about how the Factories should handle their waste/pollutants. So most of them just dumped them to the environment near the factory.

As a result, those who lives in slums near the factories have to experience u stale and hot air that is caused by the production. This caused many of them to develop some sort of respiratory illness.