Louisiana environmental officials in Baton Rouge wanted to know why ozone levels were spiking above EPA's limits to protect health on days when they should have been lower. Efforts to control regulated sources of ozone-producing chemicals had been successful. So, where were the emissions coming from?
EPA researchers collaborated with the Louisiana Department of Environmental Quality, as part of a Regional Applied Research Effort, to investigate. Using infrared technology mounted on a helicopter flying low over the Mississippi River, researchers were able to find clues to the missing sources of smog-forming chemicals that contribute to ozone.
Researchers discovered plumes of ozone-forming chemicals, invisible to the naked eye, that were leaking from barges as well as tanks. The vapors found their way out through valve seals, vent systems and other places that should not be leaking.
Louisiana officials discussed the findings with barge and tank owners. Since the emissions indicated the loss of a valuable product, the owners had a vested interest in repairing the leaks. Considerable progress has been made to fix the leaks and reduce emissions in Baton Rouge.
As a result of the research, EPA is applying the infrared technology to monitor and reduce air pollutants in other parts of the country. Originally designed for military use in night vision equipment, the technology is growing in popularity among regulators and industry. It is being used to find leaks in industrial plants, refineries and operations where fuel is stored.