Gummidipoondi vs Siwan
Side-by-side air quality comparison between Gummidipoondi 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, Gummidipoondi averaged an AQI of 107 while Siwan averaged 148 — a 41-point (38%) gap, with Siwan the more polluted and Gummidipoondi the cleaner of the two. On 596 days when both cities reported, Gummidipoondi was cleaner on 465 of them; the average daily gap was 99 AQI points.
Seasonality & days
Gummidipoondi peaks in November, while Siwan peaks in January. Gummidipoondi logged 0% Severe days and 59.1% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Gummidipoondi 49 days, Siwan 13 days.
Year-over-year progress
Gummidipoondi has worsened by 8 AQI points (8.1%) from 2021 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Gummidipoondi reached AQI 326 at Anthoni Pillai Nagar (TNPCB) on 2023-12-22; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Gummidipoondi spans 1 CPCB stations with a 0-point spread (min 99, max 99); Siwan spans 1 stations with a 0-point spread (min 197, max 197).