Chennai vs Siliguri
Side-by-side air quality comparison between Chennai and Siliguri.
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 | Siliguri |
|---|---|---|
| CO(ppb) | 637.44 | 382.00 |
| NO2(ppb) | 6.00 | 2.00 |
| O3(ppb) | 14.53 | 172.00 |
| PM10(µg/m³) | 72.13 | 71.50 |
| PM2.5(µg/m³) | 15.93 | 57.70 |
| SO2(ppb) | 1.41 | 8.70 |
| NH3(ppb) | 20.87 | — |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Siliguri averaged 81 — a 13-point (19%) gap, with Siliguri the more polluted and Chennai the cleaner of the two. On 1906 days when both cities reported, Siliguri was cleaner on 1140 of them; the average daily gap was 68 AQI points.
Seasonality & days
Chennai peaks in December, while Siliguri peaks in February. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Siliguri was 0.1% Severe and 61.8% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Siliguri 180 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Siliguri has improved by 39 AQI points (32.5%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Siliguri hit AQI 415 at Ward-32 Bapupara (WBPCB) on 2018-02-08.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Siliguri spans 1 stations with a 0-point spread (min 107, max 107).
Verdict
🏆 Chennai has better air quality with an AQI of 73 compared to Siliguri's 96.