Full Breakdown
Delhi Invokes GRAP Stage I as Air Quality Deteriorates to Poor Category
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GRAP Stage I Activation
On October 21, the Commission for Air Quality Management (CAQM) invoked Stage I of the Graded Response Action Plan (GRAP) across Delhi-NCR after the Air Quality Index (AQI) rose from “moderate” (179 on October 20) to the “poor” range on the afternoon of October 21. The order directed agencies to implement emergency pollution-control measures immediately.
Background & Context
GRAP triggers emergency actions when Delhi’s AQI crosses set thresholds: Stage I for AQI 201-300, Stage II for 301-400, and higher stages for more severe levels. The activation followed overnight Dussehra firecracker use and a night of low temperatures and light winds that limited pollutant dispersion, conditions that often worsen particulate buildup in early autumn.
Data & Statistics
- AQI progression: 179 (moderate) on Oct 20 -> 244-245 (poor) on Oct 21 (CAQM).
- Very poor stations: Jahangirpuri, Chandni Chowk, Vivek Vihar, Pusa and others exceeded 300.
- Primary pollutants: PM2.5 dominated at Jahangirpuri and Vivek Vihar; PM10 was highest at Chandni Chowk.
- Source contributions (IITM DSS): transport 20.5 % on Tuesday, projected 17.3 % by Thursday; stubble burning 8 % on Tuesday, forecast to rise above 13 % on Thursday.
- Historical context: The last comparable AQI of 246 occurred on July 13; the city’s highest reading in the past 100 days was 245 on Oct 21.
Official Statements & Responses
The CAQM noted forecasts from the India Meteorological Department (IMD) and the Indian Institute of Tropical Meteorology (IITM) predict the AQI will remain “poor” for the coming days. Delhi Environment Minister Manjinder Singh Sirsa said roughly 30 % of pollution originates within Delhi, while 60-65 % comes from surrounding regions. Under GRAP-I, authorities are strengthening dust-control measures, restricting diesel generators to emergencies, banning non-BS-VI inter-state buses, and deploying 103 mechanical road sweepers. The Delhi Metro will add 20 weekday trips, and the government has announced work-from-home arrangements for 50 % of employees, staggered office timings, and higher parking charges.
Why It Matters
AQI levels in the 201-300 range can cause breathing discomfort for people with asthma, heart disease, or other respiratory conditions. Stagnant weather, firecracker emissions, and ongoing traffic and industrial output increase cumulative exposure risk. GRAP-I measures aim to curb further deterioration while unfavorable weather persists.
Conflicting Reports & Gaps
Sources differ on the exact AQI recorded on Oct 21: CAQM cites 244-245, while other outlets report 238, 226 and 225. All agree several stations entered the “very poor” band, but the precise number and individual readings vary. No source establishes a direct causal link between Dussehra fireworks and the AQI spike; the attribution remains an assessed contribution.
Verbatim Quotes
- “The forecast by India Meteorological Department and Indian Institute of Tropical Meteorology has also predicted that AQI will remain in the poor category in the coming days,” — CAQM
What’s Next
Forecasts from IMD and IITM suggest the AQI will stay in the “poor” range for the next several days. From November 1, fuel stations will enforce a “No PUC, No Fuel” rule, and non-BS-VI vehicles registered outside Delhi will face entry restrictions, subject to exemptions. Continued monitoring and enforcement of GRAP-I measures will determine whether the AQI can be prevented from crossing into the “very poor” category.