Chennai vs Hosur
Side-by-side air quality comparison between Chennai and Hosur.
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 Hosur averaged 90 — a 22-point (32%) gap, with Hosur the more polluted and Chennai the cleaner of the two. On 96 days when both cities reported, Hosur was cleaner on 74 of them; the average daily gap was 49 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; Hosur was 0% Severe and 73.89999999999999% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Hosur 10 days.
Year-over-year progress
The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Hosur hit AQI 232 at SIPCOT Phase-1 (TNPCB) on 2022-10-25.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Hosur spans 1 stations with a 0-point spread (min 90, max 90).