The air purification system was on the verge of breaking down.

We have enough plants to make up for the lack of chemical air purification.

State officials said it was unlikely that the air purification bill would pass this session.

"There is 20 percent-a-year growth in the air purification business alone," he said.

The first part was an outline of air purification theory which he skimmed over quickly.

It is sometimes coupled with other filtering technologies for air purification.

They are used in applications such as ozone production, air purification or plasma medicine.

"We've invested in an air purification system like the one they have on the Space Shuttle."

Then the air purification begins to break down."

The expanded facility has recently been recognized for its state-of-the-art air purification system, winning several national awards.

As if suddenly remembering, he swung around and said, "Captain, how about the filters on the air purification system?

He heard nothing but the hum of the air purification system, yet his hunch was that there was.

In April, coolant seeped into the primary air purification system, causing it to fail.

A strong influence of nanochemistry on waste-water treatment, air purification and energy storage devices is to be expected.

Without power for air purification or heating, Dolphin looks set to become a frozen tomb trapped under the ice pack.

In the context of air purification, an inert machine is one whose components release no chemicals into the air.

They also linked poor air quality to planes using only half their capacity for air purification and circulation to save fuel following the energy crisis.

City Hall also lacks the temperature, humidity and air purification controls that most conservators consider essential to such a collection.

Factories, transportation, communication, air purification and creation, heat... and light.

The bottom floor housed machinery including electrical generating equipment, water and air purification systems and storage space.

Houseplants are commonly grown for decorative purposes, positive psychological effects, or health reasons such as indoor air purification.

The noise control standards had evidently been waived for this level, and so had the air purification ordinances.

He stood easily, outwardly relaxed, his hands clasped behind him as if this proceeding were nothing more significant than a standard lecture on air purification.

He later created a smaller domestic version and a larger mobile version of the air purification device to show its versatility.

Recent studies have investigated clay's absorption capacities in various applications, such as the removal of heavy metals from waste water and air purification.