Katihar vs Tiruchirappalli
Side-by-side air quality comparison between Katihar and Tiruchirappalli.
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 | Tiruchirappalli |
|---|---|---|
| PM2.5(µg/m³) | 109.20 | 6.00 |
| PM10(µg/m³) | 114.30 | 7.80 |
| NO₂(µg/m³) | 31.10 | 6.70 |
| SO₂(µg/m³) | 18.30 | 3.00 |
| O₃(µg/m³) | 43.00 | 40.00 |
| CO(µg/m³) | 770.00 | 131.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Katihar averaged an AQI of 123 while Tiruchirappalli averaged 50 — a 73-point (146%) gap, with Katihar the more polluted and Tiruchirappalli the cleaner of the two. On 75 days when both cities reported, Tiruchirappalli was cleaner on 75 of them; the average daily gap was 119 AQI points.
Seasonality & days
Katihar peaks in December, while Tiruchirappalli peaks in January. Katihar logged 3.1% Severe days and 26.9% Good-or-Satisfactory days; Tiruchirappalli was 0% Severe and 96.5% Good-or-Satisfactory. Longest clean-air streaks: Katihar 19 days, Tiruchirappalli 46 days.
Year-over-year progress
Katihar has improved by 188 AQI points (60.5%) from 2021 to 2024; Tiruchirappalli has improved by 23 AQI points (31.5%) over the same window. The worst recorded day for Katihar reached AQI 465 at Mirchaibari (BSPCB) on 2023-01-23; Tiruchirappalli hit AQI 114 at St Joseph College (TNPCB) on 2024-01-14.
Station-level disparity
Katihar spans 1 CPCB stations with a 0-point spread (min 185, max 185); Tiruchirappalli spans 1 stations with a 0-point spread (min 52, max 52).
Verdict
🏆 Tiruchirappalli has better air quality with an AQI of 10 compared to Katihar's 264. That's a significant difference of 254 points.