Beginning at 8 a.m. on November 18, 2024, the Commission for Air Quality Management (CAQM) in Delhi-NCR carries out the Stage-lV ('Severe+' Air Quality) actions of the updated Graded Response Action Plan (GRAP) in addition to the Stage-I, II, and III actions that are already in effect.The national capital's air quality index (AQI) was 441 (Severe) around 4 p.m. on Sunday, according to CAQM. The AQI recorded 447, 452, and 457 at 5 p.m., 6 p.m., and 7 p.m. on Sunday, respectively, indicating that it has been steadily rising further and has now reached the Severe+ category.Delhi's air quality is categorized into four stages according to the National Capital Region's (NCR) Graded Response Action Plan (GRAP): Stage I is "poor" (AQI 201-300); Stage II is "very poor" (AQI 301-400); Stage III is "severe" (AQI 401-450); and Stage IV is "severe plus" (AQI >450). An eight-point action plan aimed at reducing the pollution situation is part of the Stage-IV response. The prohibition of non-essential truck traffic entering Delhi, with the exception of vehicles transporting necessities or rendering necessary services, is one of the main measures.Grap 4 restriction: what's allowed and what's not1. Even for classes VI–IX and XI, the NCR State Governments and GNCTD may decide to stop holding in-person classes and instead teach online. 2. NCR State Governments/GNCTD will decide whether to permit 50% of employees in governmental, municipal, and private offices to work from home.3. GRAP Stage 4 entails ban on diesel-run medium, heavy goods vehicles registered in Delhi (BS-IV or below), except those carrying essentials.4. Entry of trucks into Delhi banned except for those carrying essential goods, services; LNG, CNG, electric, BS-VI diesel trucks allowed: CAQM.5. Prevent trucks from entering Delhi, unless they are transporting necessities or rendering necessary services. However, all trucks (LNG, CNG, electric, and BS-VI diesel) will be allowed entry into Delhi.6. Ban od C & D activities, as in GRAP Stage 3, also for linear public projects such as highways, roads, flyovers, overbridges, power transmission, pipelines, etc.7. State government may consider additional emergency measures like closure of colleges/educational institutions and closure of non-emergency commercial activities, permitting running of vehicles, and odd-even basis of registration numbers etc. 8. The Central Government has the authority to decide whether to allow its employees to work from home.