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The CAA has also ordered the gas companies to add the pungent ethyl mercaptan to the gas cylinders to make it easier to smell gas leaks.

A few pools of ethyl mercaptan the size of the reservoir in the middle of Central Park could, if spread evenly throughout the atmosphere, make the entire planet smell like a gas leak.

Ethyl mercaptan, the stuff added to natural gas to make gas leaks easier to detect, has an odor detection threshold of just 1 or 2 micrograms per cubic meter.

Andeavor Logistics says a leak in a holding tank spilled an estimated 200 to 600 gallons of ethyl mercaptan Sunday at the Fryburg Rail Loading Facility.

“Out here, this is the pure stuff, pure ethyl mercaptan.”