NASA | Ozone-rich air descends from on high

The video explains the role of the stratosphere in protecting us from UV rays and how ozone sometimes moves to the lower atmosphere, a phenomenon known as stratospheric intrusion. It discusses the EPA's ozone limits and the implications of exceeding these limits. The video also covers how states can prove that high ozone levels are not due to local pollution, using high-resolution models like Geos 5 to understand atmospheric conditions and predict ozone exceedances.

What is the primary function of the stratosphere in relation to UV rays?

• To produce oxygen for breathing

• To increase the Earth's temperature

• To protect us from harmful UV rays

• To trap heat and warm the Earth

What is a stratospheric intrusion?

• A phenomenon where ozone is depleted in the stratosphere

• A process where ozone descends from the stratosphere to the Earth's surface

• A method of measuring ozone levels in the atmosphere

• A type of pollution caused by human activities

What is the EPA's acceptable limit for ground-level ozone?

• 150 parts per billion

• 100 parts per billion

• 75 parts per billion

• 50 parts per billion

Why might states face fines related to ozone levels?

• For not planting enough trees

• For exceeding the EPA's ozone limits

• For having too many vehicles on the road

• For not reducing carbon emissions

What is the purpose of the Geos 5 model?

• To predict weather patterns

• To estimate the frequency of ozone exceedances

• To measure sea level rise

• To track animal migration