The government says power plants can make bad air for two years.

A paper on a website shows 47 power companies.

Some big power plants make the air dirty. They put bad things like lead and mercury into the air.

Some big companies own these plants. These companies are Talen Energy, Dominion Energy, NRG Energy, and Southern Co.

Rules also apply to four places of work for a big company.

The government said this will help make sure we have enough electricity and that it is not too expensive.

Michelle said coal power is important for electricity.

She said the old rules were not right and used wrong numbers.

A rule about mercury was made last year. It might have made some coal power plants close early, Bloodworth said. He also said we need these plants for electricity.

People who care about nature said the special rules were bad.

People who pollute can hurt the air we breathe. This is bad for people and the Earth.

Some groups say a government plan is bad for the environment and health.

Some people say the new email from the EPA helps companies that make things dirty.

There are rules to keep the air clean. Some places don't have to follow nine of these rules. These rules are about things like mercury and other bad things in the air. Mercury can harm your brain, especially for children. It can also harm babies before they are born.

Last week, Trump said old coal power plants can stay open to make more power. People need more power for computers and electric cars. He also said the government should find more coal and make it easier to get it.

Trump wants to help the coal business grow.