Explanation: The Graded Response Action Plan (GRAP) is a comprehensive strategy designed to mitigate air pollution in Delhi, one of the most polluted cities in the world. The plan was introduced by the Delhi government in collaboration with the Central Pollution Control Board (CPCB) and other stakeholders to address the severe air quality issues faced by the city, particularly during the winter months.
GRAP is a multi-tiered system that activates different levels of pollution control measures based on the severity of air quality conditions. The plan is divided into four levels, each with a set of actions to be taken when pollution levels reach certain thresholds. These levels are designed to be progressively more stringent as pollution levels increase, ensuring that appropriate measures are taken to reduce pollution and protect public health.
The four levels of GRAP are as follows:
1. **Level 1 (Moderate Pollution)**: This level is activated when the Air Quality Index (AQI) is between 201 and 300, which is considered "poor" to "very poor." At this level, measures such as increased mechanized sweeping, water sprinkling, and enhanced public transport services are implemented.
2. **Level 2 (Severe Pollution)**: When the AQI is between 301 and 400, which is considered "severe," additional measures are taken. These include the closure of stone crushers and hot mix plants, increased parking fees, and the restriction of construction activities.
3. **Level 3 (Severe Plus Pollution)**: At this level, the AQI is between 401 and 500, which is considered "severe plus." The measures include the closure of schools, increased parking fees, and the restriction of private vehicles on alternate days based on odd and even number plates.
4. **Level 4 (Emergency Pollution)**: This is the highest level of pollution, with an AQI above 500, which is considered "emergency." At this level, the most stringent measures are implemented, including the closure of schools, the restriction of private vehicles, and the closure of power plants and industries.
The GRAP is a dynamic plan that is continuously monitored and adjusted based on real-time air quality data. It is designed to be flexible and responsive to changing pollution levels, ensuring that appropriate measures are taken to protect public health and reduce pollution.
It is important to note that while other states and union territories may have their own environmental policies and pollution control measures, the Graded Response Action Plan is specifically designed for Delhi due to its unique air pollution challenges. The plan is a testament to the city's efforts to address its air quality issues and improve the health and well-being of its residents.