Delhi-NCR Air Pollution: How Poor AQI Is Affecting Our Health and What We Can Do to Stay Safe
From persistent coughing and breathing difficulties to increased risks of heart and lung diseases, worsening air quality in Delhi-NCR is becoming a serious public health concern. Here's what residents need to know and how they can protect themselves.
Every winter, Delhi-NCR witnesses a familiar problem: a thick layer of smog, reduced visibility and rising air pollution. However, this is not merely an inconvenience or a seasonal weather issue. Prolonged exposure to polluted air can have serious consequences for human health.
The situation has worsened following the recent Diwali celebrations. On 6 November 2026, Delhi recorded a daily average AQI of 382, prompting authorities to invoke Stage III of the Graded Response Action Plan (GRAP) across NCR. Several monitoring stations continued reporting very poor and severe air quality in the following days.
With pollution levels remaining high, it is important to understand what we are breathing, how it affects our bodies and what precautions can reduce our exposure.
Why is air pollution worsening in Delhi-NCR?
Delhi-NCR's air pollution is caused by a combination of factors rather than one single source.
Some major contributors include:
Vehicular emissions: A large number of cars, trucks, buses and two-wheelers release harmful gases and particulate matter.
Construction and road dust: Construction activities, uncovered building materials and dust from roads contribute to particulate pollution.
Industrial emissions: Factories, power generation and other industrial activities release pollutants into the atmosphere.
Crop residue burning: Seasonal stubble burning in neighbouring states adds to the pollution burden.
Firecrackers and waste burning: Fireworks and open burning release fine particles and harmful gases.
Weather conditions: During winter, low wind speeds, temperature inversions and unfavourable atmospheric conditions can prevent pollutants from dispersing.
These sources combine to create the dense pollution that residents experience across Delhi, Gurugram, Noida, Ghaziabad and Faridabad.
What does AQI actually tell us?
The Air Quality Index (AQI) is a numerical measure used to communicate the quality of the air and its potential health impact.
India's National AQI classifies air quality into six categories:
AQI range | Category | General health concern |
0-50 | Good | Minimal health impact |
51-100 | Satisfactory | Minor discomfort to sensitive individuals |
101-200 | Moderate | Breathing discomfort for sensitive individuals |
201-300 | Poor | Discomfort on prolonged exposure |
301-400 | Very Poor | Increased risk of respiratory illness |
401-500 | Severe | Health effects can occur even in healthy people |
One of the most concerning pollutants is PM2.5 - fine particulate matter with a diameter of 2.5 micrometres or less.
Because these particles are extremely small, they can travel deep into the lungs, enter the bloodstream and contribute to inflammation and damage beyond the respiratory system.
This is why high AQI is not simply an issue of unpleasant smells or reduced visibility. It is a genuine health concern.
How is air pollution affecting our health?
Air pollution can affect almost every system of the body. The severity depends on the concentration of pollutants, duration of exposure and an individual's existing health.
Respiratory problems
The respiratory system is directly exposed to polluted air. Fine particles and harmful gases can irritate the airways and trigger inflammation.
Common symptoms include:
Persistent coughing and throat irritation.
Wheezing and breathlessness.
Chest tightness.
Increased mucus production.
Worsening asthma and COPD symptoms.
Increased susceptibility to respiratory infections.
People with existing respiratory conditions may experience more frequent flare-ups and require medical attention.
Impact on heart health
Air pollution does not stop affecting the body once it enters the lungs. Fine particles can contribute to systemic inflammation and affect blood vessels and cardiovascular function.
Long-term exposure is associated with an increased risk of:
High blood pressure.
Heart disease.
Heart attacks.
Stroke.
Other cardiovascular complications.
People with existing heart conditions need to be particularly careful during periods of severe pollution.
Effects on children
Children are especially vulnerable because their lungs and immune systems are still developing. They also tend to breathe more air relative to their body weight and spend time playing outdoors.
Prolonged exposure to air pollution may affect lung development, aggravate asthma and increase respiratory problems.
Parents should reconsider outdoor sports, cycling, morning walks and playground activities when AQI levels are very poor or severe.
Effects on older adults
Ageing can reduce lung function and the body's ability to cope with environmental stress.
Older adults, particularly those with diabetes, hypertension, heart disease or chronic respiratory conditions, may experience worsening symptoms during high-pollution periods.
Eye, skin and throat irritation
Not all effects of air pollution are internal. Exposure can also cause:
Redness, itching and watering of the eyes.
Dryness and irritation of the throat.
Nasal congestion and sneezing.
Skin dryness and irritation.
Persistent or worsening symptoms should not be dismissed as ordinary seasonal allergies.
Long-term health consequences
Repeated and prolonged exposure to polluted air is associated with chronic respiratory and cardiovascular diseases. Research also links air pollution with lung cancer and adverse pregnancy outcomes.
The World Health Organization identifies air pollution as a major environmental health risk, with children, pregnant women, older adults and people with existing illnesses among the most vulnerable groups.
Who needs to be extra careful?
Although polluted air can affect everyone, certain groups face a higher risk:
Children and infants.
Older adults.
Pregnant women.
People with asthma, COPD or other lung diseases.
Individuals with heart disease or high blood pressure.
People with diabetes and other chronic conditions.
Outdoor workers, traffic personnel and delivery workers who face prolonged exposure.
These individuals should take additional precautions and follow medical advice during periods of high pollution.
Practical measures to protect yourself from air pollution
While individuals cannot control city-wide pollution levels, they can reduce their personal exposure.
Check AQI before stepping outside
Make it a habit to check the AQI before planning outdoor activities.
Use official sources such as the CPCB dashboard or the Delhi AQI portal. Remember that pollution levels can vary significantly between neighbourhoods.
Avoid outdoor exercise during high pollution
Morning walks and outdoor exercise are common routines for many Delhi-NCR residents. However, during very poor or severe AQI conditions, strenuous outdoor activity can increase the amount of polluted air inhaled.
Avoid outdoor running, jogging and cycling.
Shift workouts to an indoor environment.
Avoid prolonged outdoor activities.
Reschedule outdoor sports and recreational activities when pollution levels are high.
Do not assume that exercising outdoors is beneficial regardless of air quality.
Wear a properly fitted N95 or N99 mask
If stepping outside is unavoidable, a well-fitted N95 or N99 respirator can help reduce exposure to fine particulate matter.
Keep in mind:
The mask should cover both the nose and mouth.
It should fit closely around the face.
Replace disposable masks as recommended by the manufacturer.
Cloth masks, scarves and ordinary loose-fitting masks do not provide equivalent protection against fine particles.
A mask reduces exposure but does not eliminate all pollution-related risks.
Improve indoor air quality
Staying indoors does not automatically mean staying protected. Outdoor pollutants can enter homes through doors, windows and ventilation systems.
Some useful measures include:
Keep windows and doors closed when outdoor pollution is high.
Consider a HEPA-filter air purifier suitable for the room size.
Clean and replace filters according to manufacturer instructions.
Avoid indoor smoking, incense, mosquito coils and unnecessary burning.
Use damp mopping instead of dry sweeping to reduce dust.
Avoid ozone-generating air-cleaning devices, as ozone can irritate the lungs.
Protect children and older family members
During periods of high pollution:
Keep children away from outdoor sports and strenuous play.
Move school assemblies and physical activities indoors.
Avoid taking infants and elderly family members on unnecessary outdoor trips.
Ensure prescribed medicines are readily available.
Monitor symptoms such as coughing, wheezing and breathlessness.
When should you consult a doctor?
Occasional throat irritation or eye discomfort may improve when exposure decreases. However, certain symptoms require medical attention.
Consult a healthcare professional if you experience:
Persistent coughing or wheezing.
Repeated episodes of breathlessness.
Chest discomfort or unusual fatigue.
Worsening asthma or respiratory symptoms.
Persistent eye or throat irritation.
Seek urgent medical care for severe breathing difficulty, significant chest pain, fainting or sudden worsening of an existing heart or lung condition.
Do not attempt to manage serious symptoms through home remedies alone.
Can individual efforts solve Delhi NCR's pollution problem?
Personal precautions are important, but they cannot replace large-scale pollution control.
Reducing exposure is a short-term protective measure. Long-term improvement requires coordinated action from authorities, industries, businesses and citizens.
Some important measures include:
Better public transport and reduced dependence on private vehicles.
Effective dust control at construction sites and on roads.
Strict monitoring of industrial emissions.
Prevention of crop residue and waste burning.
Cleaner fuels and energy sources.
Better waste management.
Consistent implementation of pollution-control regulations.
The GRAP restrictions introduced by CAQM are intended to reduce emissions when air quality deteriorates. Their effectiveness depends on timely and consistent implementation across the entire NCR.
Conclusion: Clean air is a public health necessity
Delhi NCR's air pollution is not just a winter inconvenience. It is an environmental health challenge with consequences for respiratory health, cardiovascular health and overall well-being.
Children, older adults, pregnant women and people with existing medical conditions need particular protection. At the same time, even healthy individuals should avoid prolonged exposure during very poor and severe AQI conditions.
Checking daily AQI, reducing outdoor exertion, using appropriate masks, improving indoor air quality and seeking medical help when necessary can help reduce individual risk.
However, lasting improvement will require sustained efforts to control pollution at its source.
Breathing clean air should not be a seasonal privilege. It is a basic requirement for a healthy life.
Disclaimer: This article is intended for general public awareness and educational purposes. It does not replace individual medical advice, diagnosis or treatment. People experiencing persistent or severe symptoms should consult a qualified healthcare professional.
The Author :
Dr. Sunil Khattri
+91 9811618704
Dr Sunil Khattri MBBS, MS(General Surgery), LLB, is a Medical doctor and is a practicing Advocate in the Supreme Court of India and National Consumer Disputes Redressal Commission, New Delhi.