Seventy-five percent improvement in 30 years is a win for Louisiana communities Fri, 11/29/2019 - 12:00am In the last 30 years, chemical facilities operating in Louisiana have cut air emissions by 75 percent. Once inconceivable, this ...PLEASE LOG IN FOR PREMIUM CONTENT. Our website requires visitors to log in to view the best local news. Not yet a subscriber? Subscribe today! Read more about Seventy-five percent improvement in 30 years is a win for Louisiana communities