Chennai vs Guwahati
Side-by-side air quality comparison between Chennai and Guwahati.
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 | Guwahati |
|---|---|---|
| PM2.5(µg/m³) | 13.40 | 35.60 |
| PM10(µg/m³) | 16.90 | 42.00 |
| NO₂(µg/m³) | 5.50 | 1.40 |
| SO₂(µg/m³) | 9.90 | 4.80 |
| O₃(µg/m³) | 126.00 | 148.00 |
| CO(µg/m³) | 206.00 | 374.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Guwahati averaged 123 — a 55-point (81%) gap, with Guwahati the more polluted and Chennai the cleaner of the two. On 1749 days when both cities reported, Chennai was cleaner on 933 of them; the average daily gap was 77 AQI points.
Seasonality & days
Chennai peaks in December, while Guwahati peaks in January. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Guwahati was 0.1% Severe and 44.9% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Guwahati 105 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Guwahati has worsened by 14 AQI points (12.8%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Guwahati hit AQI 420 at Railway Colony (PCBA) on 2023-01-15.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Guwahati spans 4 stations with a 26-point spread (min 118, max 144).
Verdict
🏆 Chennai has better air quality with an AQI of 22 compared to Guwahati's 60.