Kolkata vs Tirunelveli
Side-by-side air quality comparison between Kolkata and Tirunelveli.
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 | Tirunelveli |
|---|---|---|
| PM2.5(µg/m³) | 64.70 | 4.40 |
| PM10(µg/m³) | 69.40 | 5.20 |
| NO₂(µg/m³) | 18.10 | 5.50 |
| SO₂(µg/m³) | 13.10 | 1.80 |
| O₃(µg/m³) | 86.00 | 30.00 |
| CO(µg/m³) | 428.00 | 151.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Tirunelveli averaged 30 — a 71-point (237%) gap, with Kolkata the more polluted and Tirunelveli the cleaner of the two. On 119 days when both cities reported, Tirunelveli was cleaner on 119 of them; the average daily gap was 99 AQI points.
Seasonality & days
Kolkata peaks in January, while Tirunelveli peaks in October. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Tirunelveli was 0% Severe and 100% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Tirunelveli 31 days.
Year-over-year progress
The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Tirunelveli hit AQI 42 at Municipal Corporation Office (TNPCB) on 2024-10-30.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Tirunelveli spans 1 stations with a 0-point spread (min 30, max 30).
Verdict
🏆 Tirunelveli has better air quality with an AQI of 7 compared to Kolkata's 117. That's a significant difference of 110 points.