Corporate Average Fuel Economy (CAFE)-III
Note
Third phase of India's Corporate Average Fuel Economy regulations notified by the Bureau of Energy Efficiency (BEE) under the Energy Conservation Act, applicable to passenger vehicle manufacturers. Phase III mandates fleet-average CO2 emission limits of approximately 91.7 g CO2/km from 2027, benchmarked against EU/global norms. Automakers must shift their product mix toward fuel-efficient and electric vehicles or face penalties, making CAFE-III a key instrument linking automotive regulation to India's NDC targets and net-zero 2070 commitment. Distinct from BS-VI norms, which target tailpipe pollutants such as NOx and particulate matter, not fleet-average CO2 or fuel economy.
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Questions on this topic
Consider the following statements regarding India's vehicular emission and fuel-efficiency regulatory framework:
- Bharat Stage emission norms primarily regulate fuel efficiency (kilometres per litre) of vehicles, while CAFE standards govern tailpipe pollutant limits such as nitrogen oxides and particulate matter.
- The transition from BS VI to BS VII forms part of a wider regulatory architecture that also encompasses CAFE fuel-efficiency standards, E20 fuel compatibility requirements, and onboard diagnostics norms.
- Selective Catalytic Reduction (SCR) systems, particulate filters, and urea-dosing are among the exhaust-treatment technologies typically required to meet tighter nitrogen-oxide emission limits for diesel vehicles.
Which of the statements given above is/are correct?
Explanation
Statement 1 is incorrect — it inverts the roles of the two frameworks. Bharat Stage (BS) norms govern tailpipe emissions: limits on pollutants such as nitrogen oxides (NOₓ), particulate matter (PM), hydrocarbons, and carbon monoxide. CAFE (Corporate Average Fuel Economy) standards, on the other hand, mandate minimum fleet-average fuel efficiency expressed in kilometres per litre — they are distinct regulatory instruments administered under different rules. Conflating the two is a classic conceptual error. Statement 2 is correct. India's current automotive regulatory push is multi-dimensional: BS VII addresses tailpipe emission limits; CAFE-III tightens fleet fuel-efficiency requirements; E20 compatibility ensures vehicles can run on 20% ethanol-blended petrol; and onboard diagnostics (OBD) norms mandate real-time monitoring of emission systems. These are parallel but interrelated regulatory tracks, not a single scheme. Statement 3 is correct. Selective Catalytic Reduction converts NOₓ into harmless nitrogen and water using a urea-based reagent (AdBlue/DEF). Combined with diesel particulate filters (DPF) and urea-dosing control units, SCR is the standard exhaust-treatment technology used by diesel vehicles to meet stringent emission norms — a factual point that holds across BS VI, Euro 6, and the proposed BS VII regime.
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