Centre Notifies Revised Emission Standards for Aluminium Plants Under Environment Protection Rules

The Ministry of Environment, Forest and Climate Change notified the Environment (Protection) Fifth Amendment Rules, 2025, on July 21, 2025, introducing stringent new emission standards for the aluminium industry. Issued in exercise of the powers conferred by Sections 6 and 25 of the Environment (Protection) Act, 1986, these rules sought to modernize the regulatory framework governing Alumina Refineries and Aluminium Smelters. The notification followed a comprehensive consultative process initiated by the publication of draft rules in November 2024, during which the Central Government invited and considered objections and suggestions from stakeholders and the general public. The new regulations substituted the existing entries under serial number 36 of Schedule I of the Environment (Protection) Rules, 1986, effectively updating the environmental benchmarks for one of the country’s most energy intensive industrial sectors.

The legislation provided: “The consumption of Aluminium Fluoride (as AlF3) in the electrolysis process shall not exceed 20 kilograms per ton of aluminium produced with effect from the date of notification.”

Under the revised summary of standards, the Alumina Refinery segment must now adhere to a Particulate Matter (tiny solid or liquid particles suspended in the air) limit of 150 mg/Nm³ for raw material handling and 100 mg/Nm³ for calcination plants. The rules also capped Carbon Monoxide emissions at a maximum of one percent. For Aluminium Smelters, the standards were bifurcated across different operational units. Green Anode plants and Anode Baking plants were assigned Particulate Matter limits of 100 mg/Nm³ and 50 mg/Nm³, respectively. Notably, the Electrolytic Pot Room standards introduced a distinction based on the age of the facility, where units established on or before December 31, 2010, must maintain Particulate Matter emissions below 50 mg/Nm³, while newer units established from January 1, 2011, onwards are held to a stricter limit of 30 mg/Nm³.

The legislative intent behind these amendments focused on mitigating the environmental impact of fluoride and sulphur dioxide emissions. The policy rationale addressed statutory gaps by mandating the use of cleaner fuels, such as Light Diesel Oil or Low Sulphur Heavy Stock, containing no more than one percent sulphur in specific processes like calcination and anode baking. To ensure rigorous enforcement, the rules required the installation of Continuous Emission Monitoring Systems for real time tracking of Particulate Matter and Sulphur Dioxide, alongside flue gas flow measurements. The amendment also addressed the ecological impact on surrounding areas by setting standards for forage fluoride (fluoride levels in vegetation consumed by livestock), requiring monitoring at locations where maximum concentrations are expected outside the industrial premises.

The statutory framework further clarified that stack heights the height of chimneys used to disperse pollutants must comply with either the Environmental Clearance based on Impact Assessment studies or the prescriptions of the State Pollution Control Board, whichever is more stringent. While the specific emission norms were updated, the rules maintained that process effluent norms would continue to be governed by individual consents issued by state authorities. Furthermore, the standards for industrial boilers previously notified under the parent rules remained applicable to the aluminium sector. These rules were scheduled to come into force upon the expiry of two years from the date of their publication in the Official Gazette, providing the industry a transition period to upgrade technology and monitoring infrastructure.

Keywords: Environment Protection Rules, Aluminium Plants, Emission Standards, MoEFCC, Particulate Matter, Alumina Refinery, Aluminium Smelter, Environmental Law India, Fluoride Emissions

Geo Tags: India
District: Not Applicable