|5/25/2012||midnight||Ch_Vista||15 ppb SO2|
|2am||Ch_Vista||121.3 ppb SO2|
|Ch_Vista||5 ppb H2S|
|3am||Ch_Vista||27.8 ppb SO2|
The EPA one-hour health standard for Sulfur Dioxide (SO2) is 75 parts per billion (ppb). Already, the sulfur levels in Chalmette have surpassed this level, with an early morning reading of SO2 at Chalmette Vista neighbor's BlueBird Park. SO2 measured 121 ppb SO2; reading available at this link, right hand column menu, click ON AIR icon, select site data, select Ch_Vista.