Why tourism is smokeless industry. explain

The tourism industry has-been named as a 'smokeless industry' because unlike normal industries which are the production of services within an economic structure which create pollution or smoke, tourism does not make or manufacture an actual product and is non-polluting.

Explanation:

according to the college board, the average cost of tuition and fees for the 2017–2018 school year was $34,740 at private colleges, $9,970 for state residents at public colleges, and $25,620 for out-of-state residents attending public universities.

antonyms have opposite meanings, and so do those two words, so they are antonyms.