Howrah vs Karur
Side-by-side air quality comparison between Howrah and Karur.
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 | Howrah | Karur |
|---|---|---|
| PM2.5(µg/m³) | 68.70 | 3.80 |
| PM10(µg/m³) | 72.60 | 4.40 |
| NO₂(µg/m³) | 22.20 | 7.30 |
| SO₂(µg/m³) | 11.50 | 2.70 |
| O₃(µg/m³) | 55.00 | 37.00 |
| CO(µg/m³) | 360.00 | 117.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Howrah averaged an AQI of 126 while Karur averaged 71 — a 55-point (77%) gap, with Howrah the more polluted and Karur the cleaner of the two. On 71 days when both cities reported, Karur was cleaner on 70 of them; the average daily gap was 152 AQI points.
Seasonality & days
Both cities see their worst air in December on average. Howrah logged 0.7% Severe days and 48.7% Good-or-Satisfactory days; Karur was 0% Severe and 80.3% Good-or-Satisfactory. Longest clean-air streaks: Howrah 120 days, Karur 34 days.
Year-over-year progress
The worst recorded day for Howrah reached AQI 500 at Ghusuri (WBPCB) on 2017-04-15; Karur hit AQI 149 at Kamadenu Nagar (TNPCB) on 2024-11-26.
Station-level disparity
Howrah spans 5 CPCB stations with a 116-point spread (min 111, max 227); Karur spans 1 stations with a 0-point spread (min 71, max 71).
Verdict
🏆 Karur has better air quality with an AQI of 6 compared to Howrah's 130. That's a significant difference of 124 points.