| Primary Pollutant | Secondary Pollutant |
|---|---|
| $(1)$ These pollutants are emitted directly into the environment from a source. | $(1)$ These pollutants are formed through the interaction of primary pollutants with other atmospheric constituents. |
| $(2)$ They persist in the same form in which they are released into the environment. | $(2)$ They are typically formed through photochemical reactions in the atmosphere. |
| $(3)$ They are generally less potent than secondary pollutants. | $(3)$ They are often more potent than primary pollutants due to synergistic effects. |
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