SAMBALPUR: Despite being categorised as highly polluting, 10 direct reduced iron (DRI) sponge iron units continue to operate in Rengali block of Sambalpur district, allegedly in violation of environmental guidelines.

Notably, the air quality index (AQI) in Rengali touched 300 this year, placing it in the ‘very unhealthy’ category. Environmental experts said areas located close to the DRI units have consistently recorded higher AQI levels.

Sponge iron plants operate either through DRI or blast furnace technology. Guidelines mandate closure of DRI units and a shift to blast furnace systems to curb pollution. However, the high cost involved in upgrading to blast furnace technology has led many sponge iron units in Rengali to ignore these directions, said sources.

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