CLEARING THE AIR: The Obama administration set the first-ever national standards on air pollution from gas wells drilled by hydraulic fracturing, or fracking, but not without making concessions to the oil and gas industry.

TIMING: Drillers now will have more than two years to employ technology to reduce emissions of smog- and soot-forming pollutants.

INDUSTRY PRESSURE: Industry groups pushed for the delay, saying equipment to reduce pollution was not readily available. About 25,000 wells a year are being fracked, a process where water, chemicals and sand are injected at high pressure underground to release trapped natural gas.

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