Seasonal Patterns

12-month breakdown of PM₂.₅ concentrations. The Harmattan dry season (November–March) typically brings elevated pollution due to dust and biomass burning.

Worst Month

Jan 2026

61.4

µg/m³ avg PM₂.₅

Best Month

Jun 2026

18.2

µg/m³ avg PM₂.₅

12-Month Average

All Months

28.8

µg/m³ · 1.9× WHO guideline

Harmattan Season (Nov–Mar)

39.5

µg/m³ avg PM₂.₅

2.6× WHO Above Ghana Std

Rainy Season (Apr–Oct)

21.2

µg/m³ avg PM₂.₅

1.4× WHO 86% cleaner than Harmattan

PM₂.₅ Month by Month

12-month rolling average · coloured by AQI range · dashed lines = WHO 15 and Ghana Std 35

Harmattan season (Nov–Mar) highlighted in amber bars.

Months Ranked: Cleanest to Most Polluted

Based on average PM₂.₅

Jun 2026

18.2 µg/m³

Jul 2026

18.2 µg/m³

Aug 2026

18.2 µg/m³

Sep 2026

18.2 µg/m³

May 2026

20.8 µg/m³

Nov 2025

23.7 µg/m³

Apr 2026

27.0 µg/m³

Dec 2025

27.1 µg/m³

Oct 2025

27.8 µg/m³

Mar 2026

39.4 µg/m³

Feb 2026

45.9 µg/m³

Jan 2026

61.4 µg/m³

WHO 2021 24h PM₂.₅ guideline: 15 µg/m³. Ghana Standard: 35 µg/m³. Updated 12:03 PM GMT.