NO₂ — Observed vs Predicted (Test Set)
Good (0–50)
Moderate (51–100)
Unhealthy Sens. (101–150)
Unhealthy (151–200)
NO₂ AQI — Observed vs Predicted (Apr 2024 – Jan 2025)
NO₂ — 12-Month Forecast (Feb 2025 – Jan 2026)
Full evaluation metrics — test set
Stationarity test results (ADF + KPSS)
ADF H₀: unit root present (non-stationary). p < 0.05 → reject H₀ → stationary. KPSS H₀: stationary. p > 0.05 → fail to reject → stationary.