Question

which air pollutant most contributes to asthma?
○ carbon monoxide
○ particulate matter
○ contaminated groundwater
○ emissions

Explanation:

To determine the air pollutant most contributing to asthma, we analyze each option:

• Carbon monoxide (CO) is toxic but less linked to asthma triggers.
• Particulate matter (PM) includes tiny particles (like PM2.5/PM10) that irritate airways, triggering asthma symptoms and inflammation, making it a key asthma - related air pollutant.
• Contaminated groundwater is a water - related pollutant, not an air pollutant, so it's irrelevant.
• “Emissions” is a general term for pollutant release, not a specific pollutant.

Answer:

B. particulate matter