He says the extent and quality of long-term literacy is important to individual economic success and quality of life in a community and a nation.

VOA: special.2009.03.27

One important factor affecting the water quality is the area's temperature and rainfall, and Hunt's model is set up for the mid-Atlantic region of the United States.

VOA: standard.2010.08.04

It says air quality is an important factor as well.

VOA: standard.2009.03.23