Which of these vehicles emission standards has been implemented throughout India since 2017 ?

Options

A. 4 wheelers: Bharat stage III , 3 wheelers : Bharat stage III , 2 wheelers : Bharat stage III
B. 4 wheelers: Bharat stage III , 3 wheelers : Bharat stage III , 2 wheelers : Bharat stage IV
C. 4 wheelers: Bharat stage III , 3 wheelers : Bharat stage III , 2 wheelers : Bharat stage III
D. 4 wheelers: Bharat stage III , 3 wheelers : Bharat stage IV , 2 wheelers : Bharat stage IV

Answer

To solve the question regarding which vehicle emission standards have been implemented throughout India since 2017, we can follow these steps:

### Step 1: Understand the Context
The question is asking about vehicle emission standards in India, which are regulations that set limits on the amount of pollutants that can be emitted by vehicles.

**Hint 1:** Look for the historical context of vehicle emission standards in India.

### Step 2: Identify Key Standards
The vehicle emission standards in India are known as Bharat Stage (BS) standards. These standards have been progressively implemented over the years to reduce vehicle emissions.

**Hint 2:** Recall the different Bharat Stage standards and their implementation timeline.

### Step 3: Focus on the Year 2017
The question specifies the year 2017. In this year, the Bharat Stage 4 (BS-IV) standards were implemented across the country. This was a significant step in regulating emissions from vehicles.

**Hint 3:** Consider what changes or updates were made to the emission standards in 2017.

### Step 4: Analyze the Emission Limits
Bharat Stage 4 standards are designed to limit the emissions of harmful pollutants such as hydrocarbons (HC) and nitrogen oxides (NOx). The implementation of these standards aimed to improve air quality and public health.

**Hint 4:** Think about the specific pollutants that these standards target.

### Step 5: Conclusion
Based on the information gathered, the correct answer to the question is that the Bharat Stage 4 (BS-IV) vehicle emission standards have been implemented throughout India since 2017.

**Final Answer:** Bharat Stage 4 (BS-IV) standards.