CA Abandons Tougher Diesel Bus Emissions Standard

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Background
Cal­i­for­nia Air Resources Board (CARB) has author­i­ty to estab­lish own air qual­i­ty rules
Nitro­gen oxide (NOx) con­tributes sig­nif­i­cant­ly to smog
Com­pressed nat­ur­al gas (CNG) pro­vides sig­nif­i­cant­ly clean­er emis­sions than diesel
South Coast Air Qual­i­ty Man­age­ment Dis­trict (SCAQMD) over­sees Los Ange­les