Perundurai vs Siwan
Side-by-side air quality comparison between Perundurai and Siwan.
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, Perundurai averaged an AQI of 75 while Siwan averaged 148 — a 73-point (97%) gap, with Siwan the more polluted and Perundurai the cleaner of the two. On 46 days when both cities reported, Perundurai was cleaner on 41 of them; the average daily gap was 88 AQI points.
Seasonality & days
Perundurai peaks in November, while Siwan peaks in January. Perundurai logged 0% Severe days and 80.7% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Perundurai 13 days, Siwan 13 days.
Year-over-year progress
The worst recorded day for Perundurai reached AQI 153 at SIPCOT Industrial Park (TNPCB) on 2024-11-12; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Perundurai spans 1 CPCB stations with a 0-point spread (min 75, max 75); Siwan spans 1 stations with a 0-point spread (min 197, max 197).