These tests were conducted by the Greek Ministry of the Environment to determine the reduction in black smoke emissions. The results were:

Particulate Reduction Tests - Diesel

Greek Environment Ministry, Athens, Greece, May 9, 1991
Particulate Tests, Diesel

These tests were conducted by the Greek Ministry of the Environment to determine the reduction in black smoke emissions. The results were:

Test
Particulate Reduction % Increase or Reduction
- 29%

Technical Institute for Urban Transportation,
Sofia, Bulgaria, May 18, 1994

These tests were conducted under stringent conditions to determine particulate reduction and fuel economy. The results were:

Test
Particulate Reduction
Miles Per Gallon (MPG) % Increase or Reduction
-30 to -50%
+ 2.66%