The Texas Natural Resource Conservation Committee (TNRCC) adopts the Environmental Protection Agency's (EPA) Tier 2 standards after more than six months of rigorous study of emissions and air quality models and systems. The TNRCC considered California's Low Emission Vehicle 2 (LEV2) program, but found that federal Tier 2 regulations provide greater oxides of nitrogen (NOx) emission reductions. Currently, NOx is Texas' largest area of concern, and by adopting EPA Tier 2 standards the ...

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