Haldia vs Salem
Side-by-side air quality comparison between Haldia and Salem.
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 | Haldia | Salem |
|---|---|---|
| PM2.5(µg/m³) | 36.30 | 8.80 |
| PM10(µg/m³) | 44.60 | 11.00 |
| NO₂(µg/m³) | 1.80 | 4.50 |
| SO₂(µg/m³) | 10.10 | 9.20 |
| O₃(µg/m³) | 157.00 | 98.00 |
| CO(µg/m³) | 292.00 | 189.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Haldia averaged an AQI of 90 while Salem averaged 68 — a 22-point (32%) gap, with Haldia the more polluted and Salem the cleaner of the two. On 329 days when both cities reported, Salem was cleaner on 183 of them; the average daily gap was 43 AQI points.
Seasonality & days
Haldia peaks in December, while Salem peaks in April. Haldia logged 0% Severe days and 65.4% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Haldia 51 days, Salem 17 days.
Year-over-year progress
Haldia has worsened by 8 AQI points (9.8%) from 2023 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Haldia reached AQI 322 at Priyambada Housing Estate (WBPCB) on 2024-11-26; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Haldia spans 1 CPCB stations with a 0-point spread (min 86, max 86); Salem spans 1 stations with a 0-point spread (min 73, max 73).
Verdict
🏆 Salem has better air quality with an AQI of 15 compared to Haldia's 61.