Howrah vs Shillong
Side-by-side air quality comparison between Howrah and Shillong.
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 | Shillong |
|---|---|---|
| PM2.5(µg/m³) | 68.70 | 18.30 |
| PM10(µg/m³) | 72.60 | 21.80 |
| NO₂(µg/m³) | 22.20 | 3.60 |
| SO₂(µg/m³) | 11.50 | 6.20 |
| O₃(µg/m³) | 55.00 | 109.00 |
| CO(µg/m³) | 360.00 | 309.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Howrah averaged an AQI of 126 while Shillong averaged 75 — a 51-point (68%) gap, with Howrah the more polluted and Shillong the cleaner of the two. On 997 days when both cities reported, Shillong was cleaner on 959 of them; the average daily gap was 113 AQI points.
Seasonality & days
Howrah peaks in December, while Shillong peaks in February. Howrah logged 0.7% Severe days and 48.7% Good-or-Satisfactory days; Shillong was 0% Severe and 92% Good-or-Satisfactory. Longest clean-air streaks: Howrah 120 days, Shillong 113 days.
Year-over-year progress
Howrah has improved by 32 AQI points (20.3%) from 2016 to 2024; Shillong has worsened by 41 AQI points (120.6%) over the same window. The worst recorded day for Howrah reached AQI 500 at Ghusuri (WBPCB) on 2017-04-15; Shillong hit AQI 212 at Lumpyngngad Shillong (PCB) on 2024-02-19.
Station-level disparity
Howrah spans 5 CPCB stations with a 116-point spread (min 111, max 227); Shillong spans 2 stations with a 2-point spread (min 42, max 44).
Verdict
🏆 Shillong has better air quality with an AQI of 31 compared to Howrah's 130. That's a significant difference of 99 points.