Siwan vs Tiruchirappalli
Side-by-side air quality comparison between Siwan 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
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Siwan averaged an AQI of 148 while Tiruchirappalli averaged 50 — a 98-point (196%) gap, with Siwan the more polluted and Tiruchirappalli the cleaner of the two. On 70 days when both cities reported, Tiruchirappalli was cleaner on 69 of them; the average daily gap was 106 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Siwan logged 5.2% Severe days and 17.7% Good-or-Satisfactory days; Tiruchirappalli was 0% Severe and 96.5% Good-or-Satisfactory. Longest clean-air streaks: Siwan 13 days, Tiruchirappalli 46 days.
Year-over-year progress
Siwan has improved by 184 AQI points (55.4%) from 2021 to 2024; Tiruchirappalli has improved by 23 AQI points (31.5%) over the same window. The worst recorded day for Siwan reached AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30; Tiruchirappalli hit AQI 114 at St Joseph College (TNPCB) on 2024-01-14.
Station-level disparity
Siwan spans 1 CPCB stations with a 0-point spread (min 197, max 197); Tiruchirappalli spans 1 stations with a 0-point spread (min 52, max 52).