Consider the following statements regarding the Central Pollution Control Board (CPCB), its statutory basis, and the Air Quality Index (AQI) framework:

Statements

1. The CPCB was constituted under the Water (Prevention and Control of Pollution) Act, 1974, and the Air (Prevention and Control of Pollution) Act, 1981 extended its mandate to include air-quality functions without creating a separate body.
2. Under the CPCB's AQI classification, an index value of 301–400 falls in the 'very poor' category, while values above 400 up to 500 constitute the 'severe' category.
3. PM2.5 is classified as a 'coarse' particulate matter because its aerodynamic diameter exceeds 10 micrometres, making it the primary pollutant of concern in urban air quality monitoring.