PDF chapter test TRY NOW

Very short answer the following question:
 
1. Name two gases which are mainly responsible for acid rain?
 
Acid rain is primarily caused by  and .
 
2. The quality of air at various locations is monitored regularly by government and other agencies? In what way can you use these data?
 
The government and other agencies regularly monitor the air quality in various locations. These data can be used to raise awareness about pollution.