Pollution Trends
Pollution Trends
Filter by pollutant, time resolution, and geography to explore concentration trends across the monitoring network.
Total Locations
public monitoring stations
Active Locations
reported in the last 24 hours
Total Recordings
in selected period
Concentrations
µg/m³ PM₂.₅
GS Exceedance (last 24 h)
--
sensor-days above Ghana Standard
AQI Distribution
--
Current AQI
--
24-hour average
Peak Hour
--
highest average concentration
Pollutant Trend
30-day daily average · PM₂.₅
Hourly Pattern
average by hour of day · last 30 days
AQI Trend
derived from concentration (µg/m³)
National Average
PM₂.₅ · 12 Sep · 18 Sep
12-month national average
PM₂.₅ Month by Month
Harmattan season (Nov–Mar) typically shows highest values.
Methodology
Active locations Stations that have reported in the last 24 hours.
GS Exceedance Proportion of stations whose 24h average PM₂.₅ exceeded Ghana Standard 35 µg/m³.
AQI Distribution Proportion of sensor-days in each US EPA PM₂.₅ AQI category.
Data cleaning Zero, negative, and null readings excluded; 75% completeness proxy applied.