After months of foul-ups, delay and a general lack of enthusiasm on the part of Vikram Tempo owners, donor agencies are contemplating a change in strategy in their bid to put more environment-friendly three-wheelers on the streets of Kathmandu. The move, if successful, would put more cleaners, and efficient electric tempos on the streets of Kathmandu, helping to reduce the Valley's air pollution. Expert say, diesel-powered Vikram tempos are a major source of air pollution in the capital. Currently, about 10,000 such three-wheelers are in service in Kathmandu.