A year of air in a "leafy" suburb

Monthly average PM2.5 from my IQAir station, northern Johannesburg

17.5
µg/m³ annual average — 3.5× the WHO guideline of 5
51%
of days exceeded the WHO 24-hour guideline (159 of 310)
5
days out of 310 broke South Africa's legal limit
WHO annual guideline (5) SA annual limit (20) partial month (station relocating)

Source: my IQAir monitor, northern Johannesburg · Jul 2025–Jun 2026 (316 days with data). Reference lines are annual-mean guidelines: WHO 2021 Global Air Quality Guideline (5 µg/m³) and South Africa's National Ambient Air Quality Standard (20 µg/m³). March–April 2026 have only a few days of data during a station move and are shown hatched. · adhir.me