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All automobilies and fuel -petrol and diesel were to have met the Euro III emission specification in some cities from 1 April 2005 and have to meet the Euro-IV norms by.

A

`"1 April 2008"`

B

`"1 April 2009"`

C

`"1 April 2010"`

D

`"1 April 2012"`

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**Step-by-Step Solution:** 1. **Understanding the Euro Emission Norms**: The Euro emission norms are standards set by the European Union to regulate the amount of pollutants that can be emitted by vehicles. Euro III and Euro IV are two such standards aimed at reducing vehicular emissions. 2. **Implementation Dates**: According to the information provided, all automobiles and fuels (petrol and diesel) were required to meet the Euro III emission specifications starting from April 1, 2005. Following this, the vehicles were mandated to comply with Euro IV norms by April 1, 2010. 3. **Purpose of the Norms**: The primary goal of implementing these norms is to reduce vehicular pollution, which is a significant contributor to air pollution, especially in metropolitan areas. 4. **Affected Cities**: The government specified that certain cities would be required to adhere to these norms. The cities mentioned include Delhi, Kolkata, Chennai, Bangalore, Hyderabad, Ahmedabad, Pune, Surat, Kanpur, and Agra. 5. **Conclusion**: Therefore, the timeline for compliance with the Euro III and Euro IV norms is as follows: - Euro III norms: Effective from April 1, 2005 - Euro IV norms: Effective from April 1, 2010 **Final Answer**: All automobiles and fuels were to meet Euro III emission specifications from April 1, 2005, and must comply with Euro IV norms by April 1, 2010. ---
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