Ozone

Tropospheric or Stratospheric

Stratospheric Ozone Screens out harmful UV rays from the sun Has been thinning due to CFC’s

Ozone’s Connection to Global Warming As the stratospheric ozone layer thins, more UV light is allowed to reach Earth’s surface Extra UV light harms plants – Phytoplankton in the ocean are reduced

Ozone’s Connection to Global Warming Less phytoplankton  Less CO2 absorbed by the ocean  More CO2 in atmosphere  More global warming

Tropospheric Ozone Harmful to living tissues Caused by chemical reactions between various air pollutants A major component of smog

Tropospheric Ozone

Sources of Ozone Pollution

Damage to Pine Needles

Measure Necrosis (in mm)

Measure Chlorosis/Chlorotic Mottle (in mm)

Don’t Measure Insect Damage or Chlorotic Fleck