Puducherry vs Siwan
Side-by-side air quality comparison between Puducherry 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 | Puducherry | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 16.40 | 114.60 |
| PM10(µg/m³) | 19.20 | 125.70 |
| NO₂(µg/m³) | 18.50 | 44.50 |
| SO₂(µg/m³) | 8.80 | 15.40 |
| O₃(µg/m³) | 37.00 | 54.00 |
| CO(µg/m³) | 394.00 | 761.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Puducherry averaged an AQI of 55 while Siwan averaged 148 — a 93-point (169%) gap, with Siwan the more polluted and Puducherry the cleaner of the two. On 776 days when both cities reported, Puducherry was cleaner on 745 of them; the average daily gap was 141 AQI points.
Seasonality & days
Puducherry peaks in December, while Siwan peaks in January. Puducherry logged 0% Severe days and 95.4% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Puducherry 117 days, Siwan 13 days.
Year-over-year progress
Puducherry has worsened by 1 AQI points (1.9%) from 2021 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Puducherry reached AQI 274 at Jawahar Nagar (PPCC) on 2022-10-25; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Puducherry spans 1 CPCB stations with a 0-point spread (min 56, max 56); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Puducherry has better air quality with an AQI of 27 compared to Siwan's 282. That's a significant difference of 255 points.