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.
If the odor doesn't seem to be coming from the vents, try to pinpoint where the smell is coming from. Use your nose. If it is gas, it usually would be from a leak in a pipe fitting or at the equipment itself. Gas odor is the one that causes the most fear. People think of gas explosions or carbon-monoxide poisoning.