Katihar vs Shillong
Side-by-side air quality comparison between Katihar and Shillong.
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 | Katihar | Shillong |
|---|---|---|
| PM2.5(µg/m³) | 105.90 | 17.90 |
| PM10(µg/m³) | 109.00 | 21.40 |
| NO₂(µg/m³) | 25.20 | 3.10 |
| SO₂(µg/m³) | 20.10 | 6.20 |
| O₃(µg/m³) | 67.00 | 118.00 |
| CO(µg/m³) | 727.00 | 304.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Katihar averaged an AQI of 123 while Shillong averaged 75 — a 48-point (64%) gap, with Katihar the more polluted and Shillong the cleaner of the two. On 461 days when both cities reported, Shillong was cleaner on 420 of them; the average daily gap was 141 AQI points.
Seasonality & days
Katihar peaks in December, while Shillong peaks in February. Katihar logged 3.1% Severe days and 26.9% Good-or-Satisfactory days; Shillong was 0% Severe and 92% Good-or-Satisfactory. Longest clean-air streaks: Katihar 19 days, Shillong 113 days.
Year-over-year progress
Katihar has improved by 188 AQI points (60.5%) from 2021 to 2024; Shillong has worsened by 41 AQI points (120.6%) over the same window. The worst recorded day for Katihar reached AQI 465 at Mirchaibari (BSPCB) on 2023-01-23; Shillong hit AQI 212 at Lumpyngngad Shillong (PCB) on 2024-02-19.
Station-level disparity
Katihar spans 1 CPCB stations with a 0-point spread (min 185, max 185); Shillong spans 2 stations with a 2-point spread (min 42, max 44).
Verdict
🏆 Shillong has better air quality with an AQI of 30 compared to Katihar's 253. That's a significant difference of 223 points.