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- ...emissions such as installing LGSs, applying selective catalytic reduction (SCR) devices to rig engines to reduce emissions of nitrogen oxides to near zero ...which are precursors to ozone formation. Pinedale operators had installed SCR devices on all of their rig engines by year-end 2011 to reduce NOx emission16 KB (2,521 words) - 17:13, 29 January 2016