If the members of the four delimited categories are counted as separate chemicals, the TRI Program covers 690 chemicals and chemical categories (i.e., 595 + 27 + 68). Note: methyl mercaptan and 2,2-dibromo-3-nitrilopropionamide are under administrative stays and are not currently reportable.
1 Open all the doors and windows.  2 You want to make sure you ventilate the house, Altman said. 3  If you suddenly notice your grass or shrubs have changed color, looking more brown or rusty, that could be a sign of a leak: the gas pouring out of the pipes.
One of the first indications of a leak may be the odor of the escaping gas. As you may know, an odorant has been added to natural gas by pipeline companies because when in its native state, natural gas is an odorless gas. Therefore, a strange or unusual smell in the area near a pipeline may indicate a leak.