How is carbon monoxide related to secondary pollutants?

Question

BlackTom AI · Accepted Answer

We start by identifying what each option says about carbon monoxide (CO) and secondary pollutants.
Option a: It has no direct relationship with secondary pollutants. This is essentially correct in many introductory explanations: CO is typically classified as a primary pollutant emitted directly from sources like vehicles and incomplete combustion, while secondary pollutants (like ozone, sulfate, nitrate) are formed in the atmosphere from chemical reactions involving precursors such as NOx, VOCs, and SO2. CO itself is not a direct precursor that forms secondary pollutants in the same straightforward way as those substances, though it can influence atmospheric chemistry indirectly by affecting radical balances. This makes the statement largely accurate in the typical sense of classification.
Option b: It is a more dangerous pollutant than other secondary pollutants. This is incorrect because CO is a primary pollutant, not a secondary pollutant, and its relative danger compared to secondary pollutants depends on context (concentration, exposure). The claim that CO is more dangerous than secondary pollutants mischaracterizes its role and does not reflect standard classifications.
Option c: It is a component in some secondary pollutants. This is not generally accurate for CO. Most secondary pollutants are formed from reactions of NOx, VOCs, SO2, and ammonia-derived species, rather than directly incorporating CO as a constituent. While CO can participate in atmospheric chemistry and influence oxidation processes, it is not typically described as a component of secondary pollutants themselves.
In summary, option a correctly reflects the conventional view that CO is a primary pollutant with no direct role as a constituent of secondary pollutants, whereas options b and c misstate CO’s classification or its direct participation in forming secondary pollutants.

ME Mod4 Intake 2A - 14 Apr 2025 - 4 Jul 2025 Practice Listening Quiz 1

How is carbon monoxide related to secondary pollutants?

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