How to fix particle system loosing quality?

Using particles I created a speeedster streak (similar to the flash) and it looked sharp and clear, but when I used the asset in my game, the particles had a blurry kind of effect. How can I remove this and make the streak look more sharp and clear?

This is how it looks in the game.

234219-capture.jpg

This is how it is supposed to look.

234221-capture1.jpg