Monitoring Ozone

Ozone in State College

Levels at 102 ppb (double). Note haze over the stadium

Ozone Injury on Black Cherry

Upper leaf surface stipple which does not cross leaf veins and not visible on lower leaf surface.

Ozone Injury on Black Cherry

Genetic variation in ozone sensitivity within Black Cherry trees. On the left is ozone-tolerant Black Cherry compared to a very sensitive tree on the far right. Note early leaf loss.

Ozone injury on Common Milkweed

Upper leaf surface stipple, not on lower leaf surface and not crossing leaf veins.

Ozone Injury on Yellow Poplar / Tulip Poplar

Typical leaf surface ozone stipple which does not cross over veins and is not present on lower leaf surface.

Open Top Chamber

Camera Monitoring Plant Growth

Plant Growth Differences ...

A variety of ozone-sensitive potato growing in an ozone filtered chamber appear much larger and greener compared to the same variety grown under ambient conditions.

Crop Output Differences ...

Potatoes on the left grown under in ozone filtered conditions in chamber, center potatoes grown in chamber with no filter and right potatoes grown in the open