I need the following question answered:

Think of an industry that pollutes the water and has access to variable technology for reducing that pollution. Explain the impact of one of the following, other things constant, on the optimal level of water quality:

1. New evidence is discovered about a greater risk of cancer from water pollution.
2. The cost of pollution-control equipment increases.
3. A technological improvement reduces the cost of pollution control.I need the following question answered:

Think of an industry that pollutes the water and has access to variable technology for reducing that pollution. Explain the impact of one of the following, other things constant, on the optimal level of water quality:

1. New evidence is discovered about a greater risk of cancer from water pollution.
2. The cost of pollution-control equipment increases.
3. A technological improvement reduces the cost of pollution control.