Question

what is the subject?
polluted air is bad for health.​

Answer 1

Answer:

POLLUTED AIR is the subject

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Answer 2

Answer:

ir pollution can affect lung development and is implicated in the development of emphysema, asthma, and other respiratory diseases, such as chronic obstructive pulmonary disease (COPD). PM and nitrogen oxide are linked to chronic bronchitis.

Explanation:

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subject = Science