'Acid Rain in China'

Summary: Acid rain was first recognized as an environmental concern in China forty years ago. Coal is China's most important source of energy, yet it greatly increases the concentration of sulfur dioxide and the Nitrogen oxides in the air. In recent years, the demand for more energy and more cars has greatly increased the amount of pollutants in the air.

Terms:
~Anthropogenic: Caused or Produced by Humans

Comments:
~The PH of acid rain in China is around 4, which means that it is very acidic
~Right now, it is hard to tell the long term effects of acid rain in China.
~Research is being devoted towards lessening the amount of sulfur dioxide released from the burning of coal, and also be able to supply the ever increasing energy demands of China.
~Acid rain effects streams, aquatic lifeforms, and plants. Evidence shows that the trees of China are taking significant damage from all of the acid rain.
~The main contributors to acid rain are coal and oil, which release sulfuric acids and Nitrous acids into our atmosphere.
~Acid rain has been recognized as an environmental concern by the Chinese government, so the government reacts to this with acid rain control zones.
~The Chinese government has also placed restrictions and regulations concerning the whereabouts of coal power plants, which lessens the amount of air contaminants in cities.

Questions: What is an "acid control rain zone?" How does that help control the acid rain?