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 naturally-occurring gas that can be good or bad for your health and the environment. depending on its location in the atmosphere. In the layer near the Earthâs surfaceâthe troposphereâ. ground-level or âbadâ ozone is an air pollutant that is a key ingredient of urban smog. But higher up, in. the stratosphere, âgoodâ ozone protects life on Earth by absorbing some of the sunâs UV rays. An easy.