How Traffic Congestion Affects Air Pollution Along the N1

The N1 links Gauteng with Limpopo, Polokwane, and routes toward Zimbabwe. Heavy trucks, diesel buses, and idling cars in congestion create pollution corridors that affect drivers, roadside communities, and suburbs downwind of the highway.

What congestion adds to the air

Accelerating and braking burns more fuel per kilometre than steady driving. Diesel exhaust adds PM2.5 and nitrogen dioxide; petrol vehicles contribute ozone precursors. In tunnels of slow traffic, pollution concentrations can be several times higher than open roadside air.

Reduce your exposure

• Check AQI before commuting; delay trips when readings are very high if possible.
• Use recirculated air in the car in heavy traffic.
• Avoid outdoor exercise within 100–200 m of the highway at rush hour.
• Support trip timing that avoids peak congestion — cleaner for you and the gridlock.

Long-term solutions — cleaner fleets, public transport, and land-use planning — take years. Day to day, your tracker helps you choose when and where to breathe easier.