Delhi NCR is frequently ranked among the most polluted regions in the world. While most people focus on outdoor air quality, what many don’t realize is that indoor air can sometimes be just as polluted—or even worse.
One of the biggest contributors to this problem is PM2.5, a type of fine particulate matter that poses serious risks when inhaled over time. In this article, we’ll explain what PM2.5 is, why it’s dangerous indoors, and what Delhi NCR residents should realistically do about it.
What Is PM2.5?
PM2.5 refers to particulate matter with a diameter of 2.5 micrometers or smaller. These particles are extremely tiny—about 30 times smaller than a human hair.
Because of their size, PM2.5 particles:
- Easily enter the respiratory system
- Reach deep into the lungs
- Can even enter the bloodstream
This makes them far more dangerous than larger dust particles.
Major Sources of PM2.5 in Delhi NCR
PM2.5 pollution in Delhi NCR comes from multiple sources, including:
- Vehicle emissions
- Construction dust
- Industrial pollution
- Crop residue burning (seasonal)
- Firecrackers during festivals
These pollutants don’t stay outdoors. They enter homes through doors, windows, ventilation gaps, and even clothing.
Why Indoor PM2.5 Levels Matter More Than You Think
Many people assume that staying indoors protects them from pollution. Unfortunately, this is not always true.
Indoor PM2.5 Can Accumulate
Once PM2.5 enters a closed space, it can:
- Remain suspended in the air for hours
- Accumulate over time
- Get trapped in poorly ventilated rooms
Activities like cooking, incense sticks, mosquito repellents, and smoking can further increase indoor PM2.5 levels.
How Dangerous Is PM2.5 Indoors?
Long-term exposure to high PM2.5 levels is associated with:
- Breathing discomfort
- Irritation of eyes, nose, and throat
- Reduced lung function
- Increased sensitivity to pollution
For children, elderly individuals, and people with existing respiratory sensitivities, indoor PM2.5 exposure can be particularly uncomfortable.
Even when outdoor AQI improves temporarily, indoor PM2.5 can remain elevated if not addressed properly.
Safe PM2.5 Levels: What Do Experts Say?
According to global health guidelines:
- PM2.5 levels below 15 µg/m³ (24-hour average) are considered safer
- In Delhi NCR, indoor PM2.5 often exceeds this level during high pollution seasons
Without intervention, indoor air quality may stay poor even when windows are closed.
How to Reduce Indoor PM2.5 in Delhi NCR Homes
While eliminating PM2.5 completely is unrealistic, levels can be significantly reduced with practical steps.
1. Limit Outdoor Air Entry During Peak Pollution
Keep windows and doors closed during:
- Early mornings
- Late evenings
- High AQI days
2. Improve Indoor Air Circulation
Proper air circulation helps prevent pollutant buildup, especially in bedrooms and living rooms.
3. Use an Air Purifier in Closed Rooms
Air purifiers designed for home use can:
- Capture fine particulate matter
- Reduce indoor PM2.5 levels
- Improve overall indoor air comfort
For small to medium rooms, budget air purifiers can still be effective when chosen correctly.
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Top 3 Air Purifiers Under ₹10,000 for Delhi NCR Homes
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Common Myths About Indoor Pollution
❌ “Indoor air is always clean”
Not true. Indoor pollution can build up silently.
❌ “Opening windows always helps”
During high pollution periods, this can make things worse.
❌ “Only expensive air purifiers work”
Effectiveness depends on room size and correct usage, not just price.
Final Thoughts
PM2.5 pollution is not just an outdoor problem in Delhi NCR — it’s very much an indoor reality. Understanding how it enters your home and how it behaves indoors is the first step toward better air quality.
Simple measures, combined with informed product choices, can make a noticeable difference in daily comfort—especially during peak pollution months.
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