Howrah vs Tiruchirappalli
Side-by-side air quality comparison between Howrah and Tiruchirappalli.
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, Howrah averaged an AQI of 126 while Tiruchirappalli averaged 50 — a 76-point (152%) gap, with Howrah the more polluted and Tiruchirappalli the cleaner of the two. On 82 days when both cities reported, Tiruchirappalli was cleaner on 82 of them; the average daily gap was 172 AQI points.
Seasonality & days
Howrah peaks in December, while Tiruchirappalli peaks in January. Howrah logged 0.7% Severe days and 48.7% Good-or-Satisfactory days; Tiruchirappalli was 0% Severe and 96.5% Good-or-Satisfactory. Longest clean-air streaks: Howrah 120 days, Tiruchirappalli 46 days.
Year-over-year progress
Howrah has improved by 32 AQI points (20.3%) from 2016 to 2024; Tiruchirappalli has improved by 23 AQI points (31.5%) over the same window. The worst recorded day for Howrah reached AQI 500 at Ghusuri (WBPCB) on 2017-04-15; Tiruchirappalli hit AQI 114 at St Joseph College (TNPCB) on 2024-01-14.
Station-level disparity
Howrah spans 5 CPCB stations with a 116-point spread (min 111, max 227); Tiruchirappalli spans 1 stations with a 0-point spread (min 52, max 52).