Kolkata vs Saharsa
Side-by-side air quality comparison between Kolkata and Saharsa.
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 | Saharsa |
|---|---|---|
| PM2.5(µg/m³) | 64.70 | 99.90 |
| PM10(µg/m³) | 69.40 | 105.70 |
| NO₂(µg/m³) | 18.10 | 26.10 |
| SO₂(µg/m³) | 13.10 | 13.00 |
| O₃(µg/m³) | 86.00 | 62.00 |
| CO(µg/m³) | 428.00 | 670.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Saharsa averaged 139 — a 38-point (38%) gap, with Saharsa the more polluted and Kolkata the cleaner of the two. On 603 days when both cities reported, Kolkata was cleaner on 380 of them; the average daily gap was 59 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; Saharsa was 1.4% Severe and 28.4% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Saharsa 20 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Saharsa has improved by 139 AQI points (50%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Saharsa hit AQI 454 at Police Line (BSPCB) on 2022-12-13.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Saharsa spans 1 stations with a 0-point spread (min 188, max 188).
Verdict
🏆 Kolkata has better air quality with an AQI of 117 compared to Saharsa's 234. That's a significant difference of 117 points.