What are primary pollutants according to the lecturer?

Question

BlackTom AI · Accepted Answer

When evaluating what 'primary pollutants' means according to the lecturer, we need to compare each statement to the standard definition used in environmental science.
Option a: 'The main pollutants in the air' is overly vague. It does not specify how these pollutants are formed or released, and it could imply a ranking or importance rather than a description of how pollutants enter the atmosphere. Therefore this option does not capture the precise concept of primary pollutants.
Option b: 'The first pollutants that are emitted into the air' suggests a temporal notion—being the earliest emitted—which is not a defining criterion for primary pollutants. Pollutants can be emitted at different times and still be considered primary if they are released directly into the atmosphere. The term does not hinge on 'first' in time.
Option c: 'Pollutants that are released straight into the atmosphere' aligns with the core idea of primary pollutants: substances emitted directly from sources into the air without undergoing chemical transformation (at the point of emission). This definition distinguishes primary pollutants from secondary pollutants, which form after atmospheric reactions.
In summary, option c correctly identifies primary pollutants as those released directly into the atmosphere, while options a and b mischaracterize the concept by either vagueness or an incorrect temporal criterion.

What are primary pollutants according to the lecturer?

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