What aqi level in Delhi can cause permanent damage of Lungs?

What aqi level in Delhi can cause permanent damage of Lungs?

Here's a clear, safe, and science-based explanation:

AQI Levels and Risk of Permanent Lung Damage

The Air Quality Index (AQI) uses the same health-impact categories worldwide (including Delhi), though Delhi often reaches the highest bands. Permanent lung damage is not tied to a precise AQI number, but the risk increases sharply at very high and prolonged exposures.

Below is the standard interpretation:

AQI Level	Category	Health Effects	Risk of Long-Term / Permanent Damage
0–100	Good/Moderate	Minimal	None expected
101–200	Unhealthy for Sensitive Groups	Irritation, reduced lung function (temporary)	Long-term exposure can begin affecting children, elderly, and asthmatics
201–300	Unhealthy	Breathing difficulty for most people	Chronic exposure may cause measurable decline in lung function
301–400	Very Unhealthy	Significant respiratory distress	High risk of long-term lung damage, especially with repeated or continuous exposure
401–500+	Hazardous / Severe	Serious health effects on everyone	Prolonged exposure can lead to permanent lung damage, increased risk of COPD, and long-term impairment

So, what AQI level in Delhi can cause permanent lung damage?

➡️ Short-term spikes (even 500+) usually do not cause permanent damage alone, but
➡️ Repeated or long-term exposure to AQI above ~300–400 greatly increases the risk of lasting or permanent lung damage, especially from PM2.5.

Why?

PM2.5 particles (most responsible for Delhi pollution peaks) can:

• lodge deep inside the alveoli,

• cause chronic inflammation,

• reduce lung growth in children,

• accelerate lung aging,

• increase lifetime risk of asthma, COPD, and heart disease.

Important note

This information is for general education, not medical diagnosis. If you have symptoms (persistent cough, breathlessness, wheezing), consulting a medical professional is recommended.

B S Vohra, Environment Activist, President, East Delhi RWAs Joint Front