Guwahati vs Kolkata
Side-by-side air quality comparison between Guwahati and Kolkata.
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 | Guwahati | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 31.90 | 64.70 |
| PM10(µg/m³) | 36.00 | 69.40 |
| NO₂(µg/m³) | 5.40 | 18.10 |
| SO₂(µg/m³) | 4.20 | 13.10 |
| O₃(µg/m³) | 97.00 | 86.00 |
| CO(µg/m³) | 393.00 | 428.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Guwahati averaged an AQI of 123 while Kolkata averaged 101 — a 22-point (22%) gap, with Guwahati the more polluted and Kolkata the cleaner of the two. On 1748 days when both cities reported, Guwahati was cleaner on 1115 of them; the average daily gap was 55 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Guwahati logged 0.1% Severe days and 44.9% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Guwahati 105 days, Kolkata 75 days.
Year-over-year progress
Guwahati has worsened by 14 AQI points (12.8%) from 2019 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Guwahati reached AQI 420 at Railway Colony (PCBA) on 2023-01-15; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Guwahati spans 4 CPCB stations with a 26-point spread (min 118, max 144); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Guwahati has better air quality with an AQI of 54 compared to Kolkata's 117. That's a significant difference of 63 points.