# Air Quality - Lesson 6 : What Has Been Done About Air Pollution?

1. Become familiar with the supplemental resources on the MEECS Air Quality CD. There you will find more detailed timelines, a Status

and Trends report from the U.S. Environmental Protection Agency (EPA), and Michigan’s Annual Air Quality Report. There is also

background material on acid rain and Cap and Trade Programs from the EPA Air Markets web site.

2. If you intend to use red cabbage as a pH indicator, boil red cabbage in a covered pan for 30 minutes or a microwave oven for 10 minutes.

Do not let the water boil away. Let cool and pour off the liquid, which will be the indicator. An alternative preparation method is to soak the

red cabbage pieces in hot water for about ten minutes or put cabbage and water in a blender and then filter. The cabbage juice will change

from deep purple to red in the presence of an acid and to blue-green in the presence of a base.