Question: Rewrite in different wordings "Houston is known for its large industrial base, including petrochemical plants and refineries, which contribute to air pollution. The primary pollutants include particulate matter (PM2.5), ozone (O3), nitrogen dioxide (NO2), and volatile organic compounds (VOCs). The American Lung Association consistently ranks Houston among the most polluted cities in the United States for ozone and particulate pollution (American Lung Association, 2022).