Ajmer vs Kolkata
Side-by-side air quality comparison between Ajmer 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 | Ajmer | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 19.50 | 71.70 |
| PM10(µg/m³) | 44.80 | 75.70 |
| NO₂(µg/m³) | 3.60 | 22.30 |
| SO₂(µg/m³) | 4.10 | 12.00 |
| O₃(µg/m³) | 60.00 | 60.00 |
| CO(µg/m³) | 152.00 | 392.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2022, Ajmer averaged an AQI of 112 while Kolkata averaged 101 — a 11-point (11%) gap, with Ajmer the more polluted and Kolkata the cleaner of the two. On 1644 days when both cities reported, Ajmer was cleaner on 985 of them; the average daily gap was 84 AQI points.
Seasonality & days
Ajmer peaks in November, while Kolkata peaks in January. Ajmer logged 0% Severe days and 54.300000000000004% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Ajmer 94 days, Kolkata 75 days.
Year-over-year progress
Ajmer has improved by 22 AQI points (16.4%) from 2017 to 2022; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Ajmer reached AQI 357 at Civil Lines (RSPCB) on 2021-03-31; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Ajmer spans 1 CPCB stations with a 0-point spread (min 102, max 102); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Ajmer has better air quality with an AQI of 45 compared to Kolkata's 140. That's a significant difference of 95 points.