Q1)The primary difference between the Boiling Water Reactor (BWR) and the Pressurized Water Reactor (PWR) is in how the steam that spins the main turbine generator is created. The BWR generates high pressure steam that leaves the reactor and goes directly to the turbine through the main steam piping.
Q2)This is generally buried underground, so it does not cause significant air pollution, greenhouse effect, or acid rain. These three are mostly caused by particulate matter or greenhouse gases that are emitted into the atmosphere
Q3)Neutrons