CEMA says savings could be as much as 362,000 tons of oil.
Government says a fee system will replace the scheme starting next year.
Air pollution concerns also hit 40 industrial units in Tehran.
Residents at Binh Dong have complained of emissions from Dai Viet cement plant.
Rapid emissions growth in China and India to hike carbon emissions 2.6%.
Expert says the industry has 2.8 bn euros worth of waste fuel going into landfills per year.
Firms ask state government for permission to process the material after ACC Cement dropped out.
Firm says it has cut emissions significantly.
Firm says it will start the installation of Art Activated Carbon Injection system next year.
Firm expects cost savings from the use of alternative power.
Firm installs computerized shipment for efficient management of greenhouse gases.
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