In the past the limit for sulfur content in diesel fuel was 500 ppm [parts per million]. The current standard for low sulfur diesel fuel allows a maximum of _____ of sulfur in the fuel.

Question

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The current standard for low sulfur diesel fuel allows a maximum of 15 ppm of sulfur in the fuel. This standard was implemented to reduce air pollution and improve air quality by decreasing the amount of sulfur oxides emitted by diesel engines.

In the Past the Limit for Sulfur Content in Diesel