Ooty vs Siwan
Side-by-side air quality comparison between Ooty 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 | Ooty | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 4.90 | 114.60 |
| PM10(µg/m³) | 5.30 | 125.70 |
| NO₂(µg/m³) | 5.70 | 44.50 |
| SO₂(µg/m³) | 0.90 | 15.40 |
| O₃(µg/m³) | 38.00 | 54.00 |
| CO(µg/m³) | 132.00 | 761.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Ooty averaged an AQI of 58 while Siwan averaged 148 — a 90-point (155%) gap, with Siwan the more polluted and Ooty the cleaner of the two. On 470 days when both cities reported, Ooty was cleaner on 452 of them; the average daily gap was 136 AQI points.
Seasonality & days
Ooty peaks in May, while Siwan peaks in January. Ooty logged 0% Severe days and 94.2% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Ooty 22 days, Siwan 13 days.
Year-over-year progress
Ooty is essentially flat from 2022 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Ooty reached AQI 164 at Bombay Castel (TNPCB) on 2024-12-17; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Ooty spans 1 CPCB stations with a 0-point spread (min 59, max 59); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Ooty has better air quality with an AQI of 8 compared to Siwan's 282. That's a significant difference of 274 points.