Chennai vs Puducherry
Side-by-side air quality comparison between Chennai and Puducherry.
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
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Puducherry averaged 55 — a 13-point (24%) gap, with Chennai the more polluted and Puducherry the cleaner of the two. On 1023 days when both cities reported, Puducherry was cleaner on 996 of them; the average daily gap was 47 AQI points.
Seasonality & days
Both cities see their worst air in December on average. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Puducherry was 0% Severe and 95.4% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Puducherry 117 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Puducherry has worsened by 1 AQI points (1.9%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Puducherry hit AQI 274 at Jawahar Nagar (PPCC) on 2022-10-25.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Puducherry spans 1 stations with a 0-point spread (min 56, max 56).