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AP® Environmental Science

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Primary and Secondary Pollutant Identification

APES-R0ECPA

Which of the following is NOT a primary pollutant?

A

$ { PM }_{ 2.5 } $

B

${ PM }_{ 10 }$

C

${ CO }$

D

${ CO }_{ 2}$

E

${ O}_{ 3 }$