Siwan vs Ulhasnagar
Side-by-side air quality comparison between Siwan and Ulhasnagar.
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 | Siwan | Ulhasnagar |
|---|---|---|
| PM2.5(µg/m³) | 108.00 | 22.10 |
| PM10(µg/m³) | 122.50 | 40.40 |
| NO₂(µg/m³) | 59.80 | 23.10 |
| SO₂(µg/m³) | 14.10 | 21.70 |
| O₃(µg/m³) | 4.00 | 19.00 |
| CO(µg/m³) | 856.00 | 208.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Siwan averaged an AQI of 148 while Ulhasnagar averaged 117 — a 31-point (26%) gap, with Siwan the more polluted and Ulhasnagar the cleaner of the two. On 331 days when both cities reported, Ulhasnagar was cleaner on 201 of them; the average daily gap was 57 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Siwan logged 5.2% Severe days and 17.7% Good-or-Satisfactory days; Ulhasnagar was 0% Severe and 46.9% Good-or-Satisfactory. Longest clean-air streaks: Siwan 13 days, Ulhasnagar 74 days.
Year-over-year progress
Siwan has improved by 184 AQI points (55.4%) from 2021 to 2024; Ulhasnagar has improved by 10 AQI points (7.9%) over the same window. The worst recorded day for Siwan reached AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30; Ulhasnagar hit AQI 319 at Sidhi Vinayak Nagar (MPCB) on 2023-11-13.
Station-level disparity
Siwan spans 1 CPCB stations with a 0-point spread (min 197, max 197); Ulhasnagar spans 1 stations with a 0-point spread (min 120, max 120).
Verdict
🏆 Ulhasnagar has better air quality with an AQI of 40 compared to Siwan's 260. That's a significant difference of 220 points.