Discussion
Assertion (A): An emission inventory is more accurate than an ambient monitoring network.
Reason (R): Inventories are built by applying emission factors to recorded activity data.
Select the correct answer from the options below.
Answer: A
Correct answer: A is false but R is true
The assertion is false. An inventory is not inherently more accurate than a monitoring network - it is an estimate built on activity data and generic factors, and its uncertainty can be large where the factors do not match local conditions or where fugitive sources dominate.
The reason is true and describes the method, but the method is precisely the source of the uncertainty. The two tools are complementary rather than competing: the inventory says where the emissions come from and what a control measure would do, while monitoring says what is actually in the air. Discrepancies between them are how both get improved.
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