Katihar vs Ujjain
Side-by-side air quality comparison between Katihar and Ujjain.
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 | Katihar | Ujjain |
|---|---|---|
| PM2.5(µg/m³) | 109.20 | 32.40 |
| PM10(µg/m³) | 114.30 | 47.70 |
| NO₂(µg/m³) | 31.10 | 6.80 |
| SO₂(µg/m³) | 18.30 | 13.70 |
| O₃(µg/m³) | 43.00 | 66.00 |
| CO(µg/m³) | 770.00 | 215.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Katihar averaged an AQI of 123 while Ujjain averaged 116 — a 7-point (6%) gap, with Katihar the more polluted and Ujjain the cleaner of the two. On 867 days when both cities reported, Ujjain was cleaner on 601 of them; the average daily gap was 86 AQI points.
Seasonality & days
Katihar peaks in December, while Ujjain peaks in November. Katihar logged 3.1% Severe days and 26.9% Good-or-Satisfactory days; Ujjain was 0.1% Severe and 33.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Katihar 19 days, Ujjain 67 days.
Year-over-year progress
Katihar has improved by 188 AQI points (60.5%) from 2021 to 2024; Ujjain has improved by 71 AQI points (38%) over the same window. The worst recorded day for Katihar reached AQI 465 at Mirchaibari (BSPCB) on 2023-01-23; Ujjain hit AQI 500 at Mahakaleshwar Temple (MPPCB) on 2023-03-10.
Station-level disparity
Katihar spans 1 CPCB stations with a 0-point spread (min 185, max 185); Ujjain spans 1 stations with a 0-point spread (min 131, max 131).
Verdict
🏆 Ujjain has better air quality with an AQI of 55 compared to Katihar's 264. That's a significant difference of 209 points.