Chennai vs Sagar
Side-by-side air quality comparison between Chennai and Sagar.
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 | Sagar |
|---|---|---|
| CO(ppb) | 637.44 | 194.00 |
| NO2(ppb) | 6.00 | 0.50 |
| O3(ppb) | 14.53 | 123.00 |
| PM10(µg/m³) | 72.13 | 70.10 |
| PM2.5(µg/m³) | 15.93 | 27.10 |
| SO2(ppb) | 1.41 | 5.30 |
| NH3(ppb) | 20.87 | — |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Sagar averaged 96 — a 28-point (41%) gap, with Sagar the more polluted and Chennai the cleaner of the two. On 1313 days when both cities reported, Sagar was cleaner on 858 of them; the average daily gap was 50 AQI points.
Seasonality & days
Chennai peaks in December, while Sagar peaks in November. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Sagar was 0% Severe and 69.9% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Sagar 57 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Sagar has worsened by 24 AQI points (33.3%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Sagar hit AQI 347 at Civil Lines (MPPCB) on 2024-12-25.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Sagar spans 2 stations with a 45-point spread (min 73, max 118).
Verdict
🏆 Sagar has better air quality with an AQI of 71 compared to Chennai's 73.