Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

The love canal tragedy was an infamous example of industrial waste dumping.
Love canal was an infamous example of what type of pollution?

Municipal type of pollution comes from sewage, storm drains, septic tanks, boats, and runoff from yards.
What type of pollution comes from sewage, storm drains, septic tanks, boats, and runoff from yards?

Microwaves kind of waves are used in radar guns.
What kind of waves are used in radar guns?