Delhi-NCR Air Quality Nears 'Severe' Category, Posing Health Risks

Delhi's AQI approaches 'severe' while Noida surpasses 400, indicating dangerously poor air quality.

Photo by Ronak Naik

Air quality in Delhi and Noida has deteriorated significantly, with Delhi's Air Quality Index (AQI) nearing the 'severe' category and Noida's surpassing 400. This alarming situation, particularly in the National Capital Region (NCR), is primarily attributed to a combination of factors including low wind speed, high humidity, and a drop in temperature, trapping pollutants close to the ground.

The Central Pollution Control Board (CPCB) data shows PM2.5 levels remaining critically high. Such poor air quality poses severe health risks, especially for vulnerable populations, and highlights the urgent need for sustained and effective pollution control measures beyond just regulatory warnings.

मुख्य तथ्य

Delhi's AQI close to 'severe' category

Noida's AQI past 400

PM2.5 levels remain critically high

Low wind speed, high humidity, drop in temperature are contributing factors

UPSC परीक्षा के दृष्टिकोण

Environmental pollution and degradation (GS-III)

Government policies and interventions for development in various sectors and issues arising out of their design and implementation (GS-II)

Health issues (GS-II)

Geography of India (Physical and Human) (GS-I)

International conventions and agreements related to environment (Prelims)

दृश्य सामग्री

Delhi-NCR Air Quality Status (December 2025)

This map illustrates the severe air quality situation across key areas of the National Capital Region (NCR) as of December 2025, with specific AQI readings highlighting the 'Very Poor' to 'Severe' categories.

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📍Delhi📍Noida📍Gurugram📍Ghaziabad

Key Air Quality Metrics & Health Impact (Delhi-NCR, December 2025)

A snapshot of critical air quality indicators and their implications, reflecting the current severe pollution levels in Delhi-NCR.

Delhi AQI (Avg.): ~390Nearing Severe
Noida AQI (Peak): >400Entered Severe
PM2.5 Levels (Delhi Avg.): ~180 µg/m³3x Safe Limit
Health Risk Category: SevereHigh Alert

और जानकारी

पृष्ठभूमि

Air pollution in the Delhi-NCR region has been a recurring and severe environmental challenge, particularly during the post-monsoon and winter months. This phenomenon is not new, with concerns escalating significantly over the last decade, leading to various policy interventions and public health advisories. The geographical bowl-shaped topography of the NCR, coupled with meteorological factors, exacerbates the problem, trapping pollutants.

नवीनतम घटनाक्रम

The recent report indicates that air quality in Delhi and Noida has once again deteriorated to 'severe' and 'very poor' categories, respectively. This is primarily driven by low wind speeds, high humidity, and a drop in temperature, which collectively lead to temperature inversion, trapping particulate matter (PM2.5) close to the ground. The Central Pollution Control Board (CPCB) data confirms critically high PM2.5 levels, posing significant health risks, especially to vulnerable populations.

बहुविकल्पीय प्रश्न (MCQ)

1. Consider the following statements regarding the Air Quality Index (AQI) in India: 1. The AQI is calculated based on eight major pollutants, including Carbon Monoxide and Ammonia. 2. An AQI reading between 401-500 is categorized as 'Severe', indicating a high risk of respiratory effects even on healthy people. 3. The 'Good' category of AQI ranges from 0-100, implying minimal impact on health. Which of the statements given above is/are correct?

उत्तर देखें

सही उत्तर: A

Statement 1 is correct. The eight pollutants are PM2.5, PM10, Ammonia, Lead, Carbon Monoxide, Nitrogen Dioxide, Sulfur Dioxide, and Ozone. Statement 2 is correct. An AQI between 401-500 is 'Severe'. Statement 3 is incorrect. The 'Good' category of AQI ranges from 0-50, not 0-100. 51-100 is 'Satisfactory'.

2. In the context of air pollution in the Delhi-NCR region, which of the following statements is NOT correct?

उत्तर देखें

सही उत्तर: D

Statement A, B, and C are correct. Temperature inversion is a key meteorological factor. GRAP was implemented by EPCA (now replaced by CAQM). Stubble burning is a major seasonal contributor. Statement D is incorrect. The NCAP aims to achieve a 20-30% reduction in PM2.5 and PM10 concentrations by 2024, with 2017 as the base year, not 2019.

3. Consider the following pairs: Pollutant Major Source 1. Particulate Matter (PM2.5): Vehicular emissions and industrial activities 2. Sulfur Dioxide (SO2): Brick kilns and power plants 3. Ozone (O3): Direct emission from industrial processes Which of the pairs given above is/are correctly matched?

उत्तर देखें

सही उत्तर: A

Pair 1 is correctly matched. PM2.5 is primarily from combustion sources like vehicles, industries, and biomass burning. Pair 2 is correctly matched. Sulfur Dioxide is a major pollutant from fossil fuel combustion in power plants and industrial processes like brick kilns. Pair 3 is incorrectly matched. Ground-level ozone (O3) is a secondary pollutant, formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, not directly emitted from industrial processes. It is a component of photochemical smog.

Source Articles

Delhi AQI close to ‘severe’, Noida past 400 | Delhi News - The Indian Express

The Indian Express·28 Dec 2025

On season’s first ‘cold day’, AQI close to ‘severe’, dull grey pall over Delhi | Delhi News - The Indian Express

The Indian Express·28 Dec 2025

GRAP-IV revoked, Stage III remains in effect: Strong winds puts Delhi’s AQI in ‘poor’ category, but air set to worsen again | Delhi News - The Indian Express

The Indian Express·28 Dec 2025