Question

which of these is an example of nonpoint-source pollution?

a. smoke comes out of a factory smokestack.

b. bright light is emitted from a street lamp.

c. exhaust is emitted from cars in a city.

d. loud music comes from a concert in the city.

Explanation:

Nonpoint - source pollution is pollution that comes from multiple, diffuse sources rather than a single, identifiable source.

• Option A: A factory smokestack is a single, identifiable source of smoke (point - source pollution).
• Option B: A street lamp emitting light is not a pollution source in the context of nonpoint - source pollution related to typical environmental pollutants (light pollution here is from a single source).
• Option C: Exhaust from cars in a city comes from many different cars (diffuse sources), so it is nonpoint - source pollution as there is no single identifiable source but many cars contributing to the exhaust pollution.
• Option D: Loud music from a concert is a single - source (the concert) of noise pollution, not nonpoint - source.

Answer:

C. Exhaust is emitted from cars in a city.