Kolkata vs Ramanathapuram
Side-by-side air quality comparison between Kolkata and Ramanathapuram.
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 | Ramanathapuram |
|---|---|---|
| PM2.5(µg/m³) | 43.70 | 5.40 |
| PM10(µg/m³) | 51.30 | 7.70 |
| NO₂(µg/m³) | 2.40 | 1.10 |
| SO₂(µg/m³) | 11.70 | 2.90 |
| O₃(µg/m³) | 180.00 | 72.00 |
| CO(µg/m³) | 355.00 | 127.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Ramanathapuram averaged 42 — a 59-point (140%) gap, with Kolkata the more polluted and Ramanathapuram the cleaner of the two. On 409 days when both cities reported, Ramanathapuram was cleaner on 386 of them; the average daily gap was 100 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Ramanathapuram was 0% Severe and 94.4% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Ramanathapuram 46 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Ramanathapuram has improved by 18 AQI points (30%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Ramanathapuram hit AQI 246 at Chalai Bazaar (TNPCB) on 2022-12-07.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Ramanathapuram spans 1 stations with a 0-point spread (min 48, max 48).
Verdict
🏆 Ramanathapuram has better air quality with an AQI of 9 compared to Kolkata's 73. That's a significant difference of 64 points.