Nairobi ranks among Africa's most polluted cities, PM2.5 concentrations reach 31.2 µg/m³, six times the WHO safe limit[1,2], and air pollution kills an estimated 21,000 Kenyans annually[4]. Of Kenya's 3.5 million registered vehicles, 65% are over ten years old[5] and many operate without functional emission controls.
Scale
Local: Nairobi neighbourhoods near transport corridors (Eastlands, Githurai, Kawangware) — PM2.5 exceeds 80 µg/m³ during peak hours.[3] National: 3.5M vehicles across Kenya's urban centres. Global: Identical conditions in Kampala, Lagos, Accra — 330M+ urban Africans exposed.
Who is affected
Residents near corridors: 2.3× higher respiratory illness rates.[3] Matatu & boda boda operators: cannot afford KES 15,000–50,000 converters. Children & elderly: highest vulnerability to PM2.5-linked asthma and reduced lung development.
Why current solutions fail:
- Catalytic converters cost KES 15,000–50,000, up to two months' income for a typical boda boda rider[14]
- 2,400+ catalytic converter thefts recorded in Nairobi in 2023 alone, operators cannot afford to replace stolen units[14]
- Regulatory enforcement is weak: only 42% of commercial vehicles undergo mandatory annual inspection[11]
- Residents near transport corridors suffer respiratory illness at 2.3× the rate of those in low-pollution areas
We engineered a five-stage Hybrid Exhaust Purification and Carbon Capture System using locally sourced, waste-derived materials, the world's first multi-stage exhaust retrofit built from coconut shells, agricultural waste, and repurposed battery components, at a fraction of existing costs.
🌱 Materials Origin
Coconut shells & maize cobs baked at 450–500°C into activated carbon — the same material used in water filters and gas masks. Filtering power (iodine value): 850 mg/g[7,8] — matches commercial grade at <10% of the cost. Kenya generates 400,000 MT of coconut shell waste annually.
💰 Cost Advantage
⚗️ Key Innovation
Our copper-manganese catalyst (CuO/MnO₂) — made from recycled batteries — activates at 110–125°C[6], exactly the exhaust temperature of a typical matatu. Standard platinum converters need 400–800°C to work. No warm-up, no external heating, cleaning starts from the moment the engine does.