Kolkata vs Ooty
Side-by-side air quality comparison between Kolkata and Ooty.
Live AQI from Open-Meteo CAMS (~45 km global model, updated hourly). Multi-year history from CPCB station data via aqinow.co pipeline (2016–2024, station-level daily records).
AQI Comparison
Pollutant-level comparison (PM2.5, PM10, O3, NO2, SO2, CO)▾
| Pollutant | Kolkata | Ooty |
|---|---|---|
| PM2.5(µg/m³) | 64.70 | 4.90 |
| PM10(µg/m³) | 69.40 | 5.30 |
| NO₂(µg/m³) | 18.10 | 5.70 |
| SO₂(µg/m³) | 13.10 | 0.90 |
| O₃(µg/m³) | 86.00 | 38.00 |
| CO(µg/m³) | 428.00 | 132.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Ooty averaged 58 — a 43-point (74%) gap, with Kolkata the more polluted and Ooty the cleaner of the two. On 315 days when both cities reported, Ooty was cleaner on 282 of them; the average daily gap was 92 AQI points.
Seasonality & days
Kolkata peaks in January, while Ooty peaks in May. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Ooty was 0% Severe and 94.2% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Ooty 22 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Ooty is essentially flat over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Ooty hit AQI 164 at Bombay Castel (TNPCB) on 2024-12-17.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Ooty spans 1 stations with a 0-point spread (min 59, max 59).
Verdict
🏆 Ooty has better air quality with an AQI of 8 compared to Kolkata's 117. That's a significant difference of 109 points.