Chennai vs Sasaram
Side-by-side air quality comparison between Chennai and Sasaram.
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 | Chennai | Sasaram |
|---|---|---|
| PM2.5(µg/m³) | 16.60 | 85.70 |
| PM10(µg/m³) | 18.20 | 96.90 |
| NO₂(µg/m³) | 16.20 | 33.60 |
| SO₂(µg/m³) | 9.00 | 12.90 |
| O₃(µg/m³) | 57.00 | 52.00 |
| CO(µg/m³) | 350.00 | 638.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Sasaram averaged 109 — a 41-point (60%) gap, with Sasaram the more polluted and Chennai the cleaner of the two. On 674 days when both cities reported, Chennai was cleaner on 411 of them; the average daily gap was 80 AQI points.
Seasonality & days
Chennai peaks in December, while Sasaram peaks in January. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Sasaram was 0.1% Severe and 37% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Sasaram 27 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Sasaram has improved by 166 AQI points (60.4%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Sasaram hit AQI 401 at Dada Peer (BSPCB) on 2021-11-28.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Sasaram spans 1 stations with a 0-point spread (min 148, max 148).
Verdict
🏆 Chennai has better air quality with an AQI of 28 compared to Sasaram's 186. That's a significant difference of 158 points.