The student had a conversation with an adult. The adult shared that when they were little, they remembered seeing tons of factories with smoke coming out of them. The students wondered what has changed in the community so that these factories stopped making heavy smoke come out of them. Why Don't We See Emissions Like This Too Often Anymore?

This photo (below) of a power plant was taken before carbon emission control equipment was added. Fossil fuel emissions are down since laws have been enacted to protect the air.

Most air pollutants come from burning fossil fuels or plant material. Some are the result of evaporation from human-made materials. Nearly half (49%) of air pollution comes from transportation, 28% from factories and power plants, and the remaining pollution from a variety of other sources.

What does the information from the article indicate?

There is no control over the amount of fossil fuel emissions.

Most air pollution comes from factories and power plants.

Laws against air pollution are working to decrease fossil fuel emissions.

Most air pollutants come for human-made materials being evaporated.