Due to the chronic nature of air pollution and the fact that its impacts fall disproportionately on the poor, it is not always recognized for its pervasive role in poor health, poverty and economic stagnation. A major source of outdoor air pollution is carbureted two-stroke engines, which power 100 million "two-wheelers" (e.g. motorcycles, scooters) and "three-wheelers" (e.g. tricycles, "tuk-tuks") across Southeast Asia. Each of these carbureted two-stroke engines produces the pollution output of 50 modern automobiles, thus contributing the pollution-equivalent of approximately 5 billion automobiles. These engines represent one of the largest sources of vehicular emissions in the world.
Envirofit International has developed a Direct In-cylinder (DI) fuel injection retrofit kit for two-stroke engines that is cleaner and more fuel efficient than the replacement four-stroke engines.
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