Dindigul vs Siwan
Side-by-side air quality comparison between Dindigul 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
Pollutant-level comparison (PM2.5, PM10, O3, NO2, SO2, CO)▾
| Pollutant | Dindigul | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 18.20 | 108.00 |
| PM10(µg/m³) | 19.70 | 122.50 |
| NO₂(µg/m³) | 28.00 | 59.80 |
| SO₂(µg/m³) | 2.70 | 14.10 |
| O₃(µg/m³) | 1.00 | 4.00 |
| CO(µg/m³) | 215.00 | 856.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Dindigul averaged an AQI of 61 while Siwan averaged 148 — a 87-point (143%) gap, with Siwan the more polluted and Dindigul the cleaner of the two. On 233 days when both cities reported, Dindigul was cleaner on 202 of them; the average daily gap was 122 AQI points.
Seasonality & days
Dindigul peaks in February, while Siwan peaks in January. Dindigul logged 0% Severe days and 67.3% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Dindigul 22 days, Siwan 13 days.
Year-over-year progress
Dindigul has improved by 29 AQI points (32.2%) from 2022 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Dindigul reached AQI 352 at Mendonsa Colony (TNPCB) on 2023-03-12; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Dindigul spans 1 CPCB stations with a 0-point spread (min 102, max 102); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Dindigul has better air quality with an AQI of 30 compared to Siwan's 260. That's a significant difference of 230 points.