Consider the following pairs regarding India's air quality monitoring framework and the Central Pollution Control Board (CPCB):

Pairs

1. CPCB (Central Pollution Control Board) — Constituted under the Water (Prevention and Control of Pollution) Act, 1974
2. AQI category 'Severe' — Affects healthy people and seriously impacts those with existing diseases
3. Air (Prevention and Control of Pollution) Act, 1981 — The statute under which CPCB was originally constituted