Combined with a new type of diesel fuel that contains very little sulfur, the most effective filters can reduce harmful pollutants by 95 percent.

The antimicrobial filter reduces bacteria, room odors, and other airborne particles for a comfortable environment.

Blue filters reduce the orange colour caused by incandescent light.

The blue filter over daylight incandescents reduces their brightness significantly.

The filters reduced the reflection and they were watching two disks and a star, the larger several times the diameter of its companion.

This filter reduced the number of targets included in the statistical analyses to 4629.

An ultraviolet filter reduces the need for chlorine and improves water conditions.

A polarizing filter reduces glare from water and glass, and can add vivid definition to clouds.

"Dirty filters can reduce the efficiency in machines by as much as 15 percent."

This filter reduces the harmonic current, which means that the non-linear device now looks like a linear load.