When sufficient ozone enters the leaves of a sensitive plant, it can:
Reduce photosynthesis, which is the process that plants use to convert sunlight to energy to live and grow.
Slow the plant's growth.
Increase sensitive plants' risk of:
diseasediseased tulip poplar leaf
tulip poplar
damage from insects
effects of other pollutants
harm from severe weather.
Also, some plants can show visible marks on their leaves when ozone is present under certain conditions.