The text describes pollution as anything that makes the environment dirty or unsafe. Which of these is an example of air pollution mentioned?

Bright lights from buildings at night

Why are air and water often cleaner in places with low population density?

Because there are fewer people, cars, and factories creating waste.

Because these areas have special machines that clean the environment.

Because people in these areas do not use electricity or water.

Because these areas receive more rain and wind to clear away dirt.

An increase in environmental pollution

Fewer choices for different kinds of jobs

It decreases because people share more.

It increases because more people are creating waste.

It stays the same regardless of the number of people.

It all gets recycled immediately.

Areas with more people always have cleaner environments.

Areas with fewer people face the biggest pollution problems.

The number of people in an area does not affect the environment.

Densely populated areas often struggle more with pollution.