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.
Smell Gas? To report a gas or carbon monoxide emergency, or if a pipeline is struck (even if no gas leak has occurred) call the National Gas Emergency Service 24 hours a day on 0800 111 999 (calls are recorded and may be monitored).More on gas emergencies.o report a gas or carbon monoxide emergency, or if a pipeline is struck (even if no gas leak has occurred) call the National Gas Emergency Service 24 hours a day on 0800 111 999 (calls are recorded and may be monitored). More on gas emergencies.