Mumbai vs Siwan
Side-by-side air quality comparison between Mumbai 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 | Mumbai | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 20.90 | 44.90 |
| PM10(µg/m³) | 39.90 | 69.80 |
| NO₂(µg/m³) | 4.80 | 0.60 |
| SO₂(µg/m³) | 10.50 | 6.90 |
| O₃(µg/m³) | 96.00 | 187.00 |
| CO(µg/m³) | 166.00 | 225.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Mumbai averaged an AQI of 93 while Siwan averaged 148 — a 55-point (59%) gap, with Siwan the more polluted and Mumbai the cleaner of the two. On 491 days when both cities reported, Siwan was cleaner on 266 of them; the average daily gap was 86 AQI points.
Seasonality & days
Mumbai peaks in December, while Siwan peaks in January. Mumbai logged 0.5% Severe days and 34% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Mumbai 58 days, Siwan 13 days.
Year-over-year progress
Mumbai has improved by 4 AQI points (4.1%) from 2016 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Mumbai reached AQI 500 at Vile Parle West (MPCB) on 2022-08-15; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Mumbai spans 29 CPCB stations with a 74-point spread (min 77, max 151); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Mumbai has better air quality with an AQI of 40 compared to Siwan's 75.