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26 Dec 2025·Source: The Indian Express
2 min
Environment & EcologyEnvironment & EcologyNEWS

Delhi's Air Quality Improves Temporarily, But Long-Term Outlook Remains Challenging

Delhi's AQI sees temporary improvement due to weather, but experts warn relief may be short-lived.

Delhi's Air Quality Improves Temporarily, But Long-Term Outlook Remains Challenging

Photo by Eugene Chystiakov

Delhi's air quality saw a temporary improvement, moving from 'very poor' to 'poor' category, primarily due to favorable meteorological conditions like increased wind speed and rain. However, experts from the India Meteorological Department (IMD) and SAFAR warn that this relief is likely short-lived, with AQI expected to deteriorate again as wind speeds drop and temperatures fall.

This highlights the persistent challenge of air pollution in the National Capital Region, where local emissions from vehicles, industries, and construction, combined with regional factors like stubble burning, contribute to severe winter pollution. The Graded Response Action Plan (GRAP) is often implemented, but long-term structural changes are needed to ensure sustained clean air.

Key Facts

1.

Delhi's AQI improved from 'very poor' to 'poor' category

2.

Improvement attributed to increased wind speed and rain

3.

IMD and SAFAR predict deterioration in AQI soon

UPSC Exam Angles

1.

Environmental pollution and degradation (GS-III)

2.

Government policies and interventions for development in various sectors (GS-II)

3.

Health issues (GS-II)

4.

Disaster management (GRAP as a response mechanism) (GS-III)

5.

Role of various institutions and bodies (CAQM, CPCB, IMD, SAFAR) (GS-II)

Visual Insights

Delhi-NCR Air Pollution: Regional Sources & Impact Zone (Dec 2025)

This map illustrates the geographical context of Delhi's air pollution, highlighting the National Capital Region (NCR) and surrounding states known for significant contributions, particularly stubble burning during winter months. The arrows indicate the general direction of pollutant transport.

Loading interactive map...

📍Delhi (NCR)📍Punjab📍Haryana📍Western Uttar Pradesh

Delhi's Air Quality Snapshot: December 2025

A quick overview of Delhi's current air quality status, highlighting the temporary improvement and key contributing factors as of December 2025.

Current AQI (Delhi)
255-80 points

Moved from 'Very Poor' (301-400) to 'Poor' (201-300) category due to favorable winds and rain. Still unhealthy for sensitive groups.

Dominant Pollutant
PM2.5N/A

Fine particulate matter remains the primary concern due to its ability to penetrate deep into lungs and cause severe health issues.

Meteorological Influence
High Wind Speed, RainImproved dispersion

Increased wind speed (15-20 kmph) and recent rainfall helped disperse pollutants, leading to temporary relief. Expected to drop soon.

GRAP Status
Stage II (Very Poor)Potentially Stage I

Despite temporary improvement, GRAP measures for 'Very Poor' or 'Poor' categories are likely to remain active or be re-imposed as conditions deteriorate. CAQM monitors closely.

More Information

Background

Air pollution in Delhi-NCR has been a persistent and severe environmental and public health crisis, particularly during the winter months. This phenomenon is a complex interplay of geographical factors (landlocked region, low wind speeds), meteorological conditions (temperature inversion, low temperatures), and anthropogenic activities (vehicular emissions, industrial pollution, construction dust, biomass burning, stubble burning in neighboring states). Over the years, various measures, including the Graded Response Action Plan (GRAP), have been implemented to mitigate the crisis.

Latest Developments

The recent news highlights a temporary improvement in Delhi's air quality from 'very poor' to 'poor' category, attributed primarily to favorable meteorological conditions like increased wind speed and rain. However, this relief is deemed short-lived by experts, with predictions of deterioration as weather conditions change. This underscores the transient nature of improvements driven by external factors and the deep-rooted structural challenges that continue to plague the region's air quality.

Practice Questions (MCQs)

1. Consider the following statements regarding the Air Quality Index (AQI) in India: 1. The AQI categorizes air quality based on the concentration of eight major pollutants. 2. An AQI reading in the 'Poor' category indicates that prolonged exposure can cause respiratory illness in people with heart or lung diseases. 3. The System of Air Quality and Weather Forecasting And Research (SAFAR) is responsible for disseminating AQI information across major Indian cities. Which of the statements given above is/are correct?

  • A.1 and 2 only
  • B.2 and 3 only
  • C.1 and 3 only
  • D.1, 2 and 3
Show Answer

Answer: D

Statement 1 is correct: The AQI in India considers eight pollutants: PM2.5, PM10, Ammonia, Lead, Carbon Monoxide, Nitrogen Dioxide, Sulfur Dioxide, and Ozone. Statement 2 is correct: As per the AQI categorization, 'Poor' (201-300) means 'Breathing discomfort to most people on prolonged exposure. May cause respiratory illness on prolonged exposure to people with heart or lung diseases, older adults, and children.' Statement 3 is correct: SAFAR, an initiative of the Ministry of Earth Sciences, provides location-specific information on air quality and weather, including AQI, for major Indian cities.

2. With reference to the Graded Response Action Plan (GRAP) for air pollution in Delhi-NCR, consider the following statements: 1. GRAP is implemented by the Central Pollution Control Board (CPCB) under the Environment Protection Act, 1986. 2. Measures under GRAP are invoked based on the severity of air quality, with Stage I (Poor) being the least stringent and Stage IV (Severe+) being the most stringent. 3. The Commission for Air Quality Management (CAQM) is empowered to enforce GRAP and issue directions to state governments in the NCR. Which of the statements given above is/are correct?

  • A.1 and 2 only
  • B.2 and 3 only
  • C.1 and 3 only
  • D.1, 2 and 3
Show Answer

Answer: B

Statement 1 is incorrect: While CPCB plays a role, GRAP was initially notified by the Ministry of Environment, Forest and Climate Change (MoEFCC) and is now primarily enforced and monitored by the Commission for Air Quality Management (CAQM), which superseded the EPCA (Environment Pollution (Prevention and Control) Authority). Statement 2 is correct: GRAP has four stages (Stage I - Poor, Stage II - Very Poor, Stage III - Severe, Stage IV - Severe+) with progressively stricter measures. Statement 3 is correct: The CAQM, established in 2020, has comprehensive powers to coordinate, research, plan, and enforce measures for air quality management in the NCR, including the implementation of GRAP.

3. Which of the following factors are primarily responsible for the severe air pollution episodes in the National Capital Region (NCR) during the winter months? 1. Stubble burning in neighboring agricultural states. 2. Low wind speeds and temperature inversion phenomenon. 3. Emissions from thermal power plants and industries in the region. 4. Dust from construction and demolition activities. Select the correct answer using the code given below:

  • A.1, 2 and 3 only
  • B.2, 3 and 4 only
  • C.1, 3 and 4 only
  • D.1, 2, 3 and 4
Show Answer

Answer: D

All four factors listed are significant contributors to air pollution in the NCR during winter. Stubble burning in Punjab, Haryana, and Uttar Pradesh creates a large plume of smoke. Low wind speeds and temperature inversion trap pollutants close to the ground. Emissions from vehicles, industries, and thermal power plants are constant sources, and dust from construction and demolition activities adds to particulate matter.

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