Delhi’s Air Quality Mismatch: Why Does 279 AQI Feel Like 350+?
Delhi’s air pollution is no stranger to alarming headlines, but this winter, a new confusion has emerged. While the Air Quality Index (AQI) often shows “poor” levels (around 279), the dense smog makes it seem far worse—closer to 350+ AQI. This disconnect raises questions about monitoring accuracy and what’s really in Delhi’s air.
4 Reasons Why Delhi’s AQI Appears Worse Than Reported
1. PM2.5 vs. Composite AQI: The Visibility Factor
- The AQI combines multiple pollutants (PM2.5, PM10, NO2, CO, etc.), but PM2.5 is the main culprit behind haze and health risks.
- If PM2.5 spikes (e.g., 200+ µg/m³) while other pollutants stay low, the AQI may stay “moderate” despite visibly toxic air.
2. Localized Pollution Hotspots vs. Citywide Averages
- Delhi’s official AQI is an average of readings from stations like Lodhi Road (cleaner) and Anand Vihar (dirtier).
- If you’re near traffic or industrial zones, the air can feel far worse than the reported AQI.
3. Humidity and Winter Inversions Trap Pollution
- Cold air and high humidity act like a lid, trapping PM2.5 near the ground. This makes smog thicker even if pollution levels haven’t surged.
4. Delayed or Smoothed AQI Data
- Official AQI updates are often 24-hour averages, masking short-term spikes. Real-time apps (e.g., IQAir) may show higher numbers.
Why This Gap Matters
When the AQI says “moderate,” people underestimate risks, skipping masks or outdoor precautions. Yet, even AQI 279 can harm lungs—especially for kids and seniors.
Is Delhi’s Pollution Data Accurate?
Critics highlight flaws:
– Monitoring biases: Stations in cleaner areas may skew averages.
– PM2.5 underweighted: The AQI formula doesn’t prioritize the most harmful pollutant.
– Lack of hyperlocal data: Residents need real-time, neighborhood-level updates.
How to Protect Yourself
- Use apps like AirVisual or Sameer App for real-time PM2.5 levels.
- Wear N95 masks even if AQI seems “moderate” (100+).
- Demand better transparency in pollution reporting.
Key Takeaway
Delhi’s AQI is a useful benchmark, but your eyes and lungs don’t lie. Until monitoring improves, treat visible smog as a red flag—no matter what the numbers say.
#DelhiPollution #AQI #PM2.5 #WinterSmog #AirQuality
