Intestinal metaplasia is also a common in Barrett esophagus. It this condition it is the esophageal squamous epithelial cells that undergo metaplasia. Approximately, 60% of esophageal cancers diagnosed in the U.S. stem from focal intestinal metaplasia.
Ozone Emission Sources. Emissions contributing to ozone formation come from many areas. The main emission sources categories are: On-road - cars, trucks, and buses. Off-road - aircraft, locomotive,etc. Non-road - construction, agricultural equipment, etc. Point - cement and power plants.
Ozone is a toxic air pollutant that is a concern for people's health when levels in outdoor are high. Ozone is the principal component of the mixture of air pollutants known as smog that is produced from the action of sunlight on air contaminants from automobile exhausts and other sources.