Gracie, a Clean Air Ambassador, explains the six criteria pollutants based on EPA standards: sulfur dioxide, particulate matter, nitrogen dioxide, ozone, lead, and carbon monoxide. She discusses their sources, effects, and the importance of air pollution control. Despite improvements since the Clean Air Act, challenges remain, especially with nitrogen oxides. The video emphasizes the role of local air pollution control districts and provides resources for further learning.

What is the primary role of a Clean Air Ambassador?

• To monitor air quality levels

• To conduct air quality research

• To enforce air quality regulations

• To educate the public about air pollution

Which of the following is NOT one of the six criteria pollutants?

• Ozone

• Lead

• Methane

• Sulfur Dioxide

What is a common source of carbon monoxide emissions?

• Industrial waste

• Vehicle exhaust

• Agricultural activities

• Natural gas leaks

How has the phase-out of leaded gasoline affected airborne lead levels?

• Increased them significantly

• Caused them to fluctuate

• Decreased them significantly

• Had no effect

What natural sources can contribute to ozone formation?

• Volcanic eruptions

• Trees and plants

• Ocean waves

• Soil erosion

Why have nitrogen dioxide levels not decreased since 1970?

• Increased industrial activity

• More vehicles on the road

• Stricter regulations

• Higher natural emissions

What is the primary health concern associated with particulate matter?

• Skin irritation

• Hearing loss

• Lung and respiratory issues

• Eye infections

What distinguishes coarse particles (PM10) from fine particles (PM2.5)?

• Their source

• Their color

• Their size

• Their chemical composition

Which industry is a major source of sulfur dioxide emissions?

• Textile manufacturing

• Steel mills

• Food processing

• Pharmaceuticals

What is the purpose of the National Ambient Air Quality Standards?

• To promote industrial growth

• To protect public health

• To increase vehicle emissions

• To reduce energy consumption