Kolkata vs Silchar
Side-by-side air quality comparison between Kolkata and Silchar.
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 | Silchar |
|---|---|---|
| PM2.5(µg/m³) | 64.70 | 35.20 |
| PM10(µg/m³) | 69.40 | 45.10 |
| NO₂(µg/m³) | 18.10 | 10.60 |
| SO₂(µg/m³) | 13.10 | 6.70 |
| O₃(µg/m³) | 86.00 | 100.00 |
| CO(µg/m³) | 428.00 | 270.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Silchar averaged 52 — a 49-point (94%) gap, with Kolkata the more polluted and Silchar the cleaner of the two. On 352 days when both cities reported, Silchar was cleaner on 320 of them; the average daily gap was 75 AQI points.
Seasonality & days
Kolkata peaks in January, while Silchar peaks in February. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Silchar was 0% Severe and 100% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Silchar 87 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Silchar has worsened by 11 AQI points (26.8%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Silchar hit AQI 89 at Tarapur (PCBA) on 2023-04-29.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Silchar spans 1 stations with a 0-point spread (min 47, max 47).
Verdict
🏆 Silchar has better air quality with an AQI of 59 compared to Kolkata's 117. That's a significant difference of 58 points.