Kolkata vs Nārnaul
Side-by-side air quality comparison between Kolkata and Nārnaul.
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 | Kolkata | Nārnaul |
|---|---|---|
| PM2.5(µg/m³) | 71.70 | 45.80 |
| PM10(µg/m³) | 75.70 | 120.10 |
| NO₂(µg/m³) | 22.30 | 21.00 |
| SO₂(µg/m³) | 12.00 | 7.10 |
| O₃(µg/m³) | 60.00 | 63.00 |
| CO(µg/m³) | 392.00 | 386.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Nārnaul averaged 94 — a 7-point (7%) gap, with Kolkata the more polluted and Nārnaul the cleaner of the two. On 1581 days when both cities reported, Nārnaul was cleaner on 954 of them; the average daily gap was 70 AQI points.
Seasonality & days
Kolkata peaks in January, while Nārnaul peaks in November. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Nārnaul was 0.1% Severe and 40.8% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Nārnaul 63 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Nārnaul has improved by 37 AQI points (28.2%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Nārnaul hit AQI 435 at Shastri Nagar (HSPCB) on 2023-11-16.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Nārnaul spans 1 stations with a 0-point spread (min 130, max 130).
Verdict
🏆 Nārnaul has better air quality with an AQI of 114 compared to Kolkata's 140.