Hajipur vs Kolkata
Side-by-side air quality comparison between Hajipur and Kolkata.
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 | Hajipur | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 99.00 | 71.70 |
| PM10(µg/m³) | 111.80 | 75.70 |
| NO₂(µg/m³) | 49.30 | 22.30 |
| SO₂(µg/m³) | 18.10 | 12.00 |
| O₃(µg/m³) | 19.00 | 60.00 |
| CO(µg/m³) | 784.00 | 392.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Hajipur averaged an AQI of 173 while Kolkata averaged 101 — a 72-point (71%) gap, with Hajipur the more polluted and Kolkata the cleaner of the two. On 1255 days when both cities reported, Kolkata was cleaner on 648 of them; the average daily gap was 60 AQI points.
Seasonality & days
Hajipur peaks in December, while Kolkata peaks in January. Hajipur logged 0.3% Severe days and 36.6% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Hajipur 36 days, Kolkata 75 days.
Year-over-year progress
Hajipur has worsened by 74 AQI points (74.7%) from 2020 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Hajipur reached AQI 427 at Industrial Area (BSPCB) on 2024-11-12; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Hajipur spans 1 CPCB stations with a 0-point spread (min 149, max 149); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Kolkata has better air quality with an AQI of 140 compared to Hajipur's 231. That's a significant difference of 91 points.