Which color,as used in the Air Quality Index,warns that the level of a pollutant is hazardous,the most dangerous level?
A) orange
B) green
C) yellow
D) maroon
Correct Answer:
Verified
Q2: A(n) _ is a fixed number of
Q14: A substance that can be broken down
Q20: Which pollutant is present in air as
Q22: Which process does not involve a chemical
Q23: In general,which airborne material is not likely
Q24: Which diagram(s)best represent(s)only diatomic molecules? 
Q26: Which is not a pure substance?
A)helium
B)copper wire
C)air
D)sucrose
Q27: Which is not a single pure substance?
A)copper
B)water
C)brass
D)chlorine
Q28: The highest (or uppermost)layer of our atmosphere
Q29: The chemist,at about the time of the
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