What is air pollution defined as in the passage?

• Contamination of the environment by chemical, physical, or biological agents

• Natural alteration of atmospheric characteristics

• Only outdoor environmental contamination

• A minor environmental health hazard

Which pollutant is mentioned as particularly harmful due to its ability to penetrate deep into lung tissue?

• Carbon monoxide

• Ozone

• Fine particulate matter (PM2.5)

• Sulfur dioxide

According to the passage, how many deaths annually are attributed to air pollution?

• Approximately seven million

• Approximately one million

• Approximately ten million

• Approximately five million

What is the purpose of the Air Quality Index (AQI) as described in the passage?

• To report daily air quality and its potential health effects

• To measure greenhouse gas emissions

• To regulate industrial emissions

• To monitor climate change

Which act in the United States has been instrumental in reducing air pollution by regulating harmful emissions?

• The Clean Air Act

• The Environmental Protection Act

• The Air Quality Control Act

• The Pollution Prevention Act