The central idea of the text is found right in its subject or topic. It states that unclean air can harm the brain and stress the body.
The section or detail from the text that supports the answer above is:
"A 2016 study reported that breathing dirty air is now the fourth leading cause of deaths worldwide".
The purpose of the text is to show and educate the readers on the dangers that air pollution poses to humanity.
Paragraphs 1 and 2 contain facts and statistics that buttress the author's claim.
For example, in paragraph 2, it is stated that:
"Inhaling the blackened air sent 150,000 persons to the hospital with breathing problems."
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