The first law at the national level to have a substantial impact on air pollution in the United States was the ________.
Fill in the blank(s) with the appropriate word(s).
Question 2
With reference to urban heat islands, the temperatures in major metropolitan areas sometimes exceed those of the surrounding areas by as much as
A) 2 degrees C.
B) 5 degrees C.
C) 10 degrees C.
D) 12 degrees C.