Impact on Atmosphere

What is photochemical smog mainly caused by?

• Volcanic ash

• Pollen and dust

• Sunlight reacting with nitrogen and carbon compounds

• Water vapor condensation

Which human activity most directly contributes to photochemical smog?

• Planting trees

• Riding bicycles

• Driving fossil fuel-powered vehicles

• Walking to school

What harmful substance is produced near Earth’s surface as part of photochemical smog?

• Oxygen

• Methane

• Ozone

• Nitrogen

Where is ozone helpful rather than harmful?

• Inside cars

• In the upper atmosphere

• On rooftops

• In rivers and lakes

What weather condition enhances the formation of photochemical smog?

• Rain

• Snow

• Sunlight

• Wind

What do CFCs stand for?

• Carbon-fuel cells

• Chlorofluorocarbons

• Chemical-fused compounds

• Clean fossil components

How do CFCs harm the atmosphere?

• They release oxygen

• They trap moisture

• They destroy ozone molecules

• They increase plant growth

What is the function of ozone in the upper atmosphere?

• Makes clouds form faster

• Reflects visible light

• Absorbs harmful ultraviolet rays

• Increases CO₂ absorption

What health issue is linked to a thinner ozone layer?

• Asthma

• Skin cancer

• Diabetes

• High blood pressure

Which agreement helped reduce the use of CFCs?

• Kyoto Protocol

• Paris Agreement

• Montreal Protocol

• Greenhouse Accord