Kolkata vs Nagapattinam
Side-by-side air quality comparison between Kolkata and Nagapattinam.
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 | Nagapattinam |
|---|---|---|
| PM2.5(µg/m³) | 71.70 | 12.00 |
| PM10(µg/m³) | 75.70 | 15.60 |
| NO₂(µg/m³) | 22.30 | 10.70 |
| SO₂(µg/m³) | 12.00 | 3.80 |
| O₃(µg/m³) | 60.00 | 35.00 |
| CO(µg/m³) | 392.00 | 206.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Nagapattinam averaged 60 — a 41-point (68%) gap, with Kolkata the more polluted and Nagapattinam the cleaner of the two. On 47 days when both cities reported, Nagapattinam was cleaner on 45 of them; the average daily gap was 95 AQI points.
Seasonality & days
Kolkata peaks in January, while Nagapattinam peaks in November. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Nagapattinam was 0% Severe and 91.5% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Nagapattinam 8 days.
Year-over-year progress
The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Nagapattinam hit AQI 113 at Velippalayam (TNPCB) on 2024-12-16.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Nagapattinam spans 1 stations with a 0-point spread (min 60, max 60).
Verdict
🏆 Nagapattinam has better air quality with an AQI of 20 compared to Kolkata's 140. That's a significant difference of 120 points.