Key takeaway
What This Development Means
The Delhi industrial PM limit of 50 mg/Nm³ will apply to all covered industries from 1 October 2026. Operators should complete air-pollution control upgrades, reserve laboratory capacity and verify stack performance before the revised deadline.
Which Industries Face The 1 October Deadline?
Clause 21(i) covers 17 highly polluting categories, medium and large red-category air-polluting industries, food and food-processing units, textile operations with boilers or thermic-fluid heaters, and metal industries with furnaces across Delhi-NCR. Businesses should confirm site coverage against Direction No. 98 and applicable pollution-control consents before planning around the revised deadline.
Did CAQM Weaken The Particulate Limit?
No. CAQM retained the uniform maximum of 50 mg/Nm³ and moved the implementation date to 1 October 2026 for all covered industries. Other provisions and conditions remain unchanged. A lower limit imposed through an applicable consent, direction or statutory rule still governs, so each site must check its specific authorisations.
India's air-quality commission moved the Delhi industrial PM limit to 1 October 2026 for every industry covered by statutory Direction No. 98, according to an official update published on 31 July. The binding amendment gives affected factories across Delhi-NCR additional time to install or retrofit controls while retaining the uniform limit of 50 mg/Nm³.
The change affects major manufacturing categories in the National Capital Region and adjoining areas. It has direct implications for operators, equipment suppliers, laboratories, advisers and international customers assessing environmental performance in Indian supply chains.
Uniform Particulate Standard Replaces The Split Timetable
Direction No. 98 originally applied the Delhi industrial PM limit from 1 August to large and medium sites, with remaining covered sites following on 1 October. The amendment replaces that split schedule with a single 1 October start date for all industries within clause 21(i).
The scope includes 17 highly polluting categories identified by the Central Pollution Control Board, medium and large red-category air-polluting industries, food and food-processing units, textile sites using boilers or thermic-fluid heaters, and metal industries operating furnaces. A stricter limit already imposed through another consent, direction or statutory provision still takes precedence.
Pollution-Control Upgrades Need Completion And Verification
The Commission for Air Quality Management said industry representations highlighted long procurement and installation periods for air-pollution control devices, limited capacity for adequacy assessments and constraints among recognised laboratories. It nevertheless maintained that the 50 mg/Nm³ standard is technically achievable and environmentally necessary.
Covered sites should complete equipment procurement, installation or retrofitting, commission performance checks and secure laboratory capacity before October. Environmental teams should confirm stack-testing points, operating conditions, maintenance routines and evidence required by the relevant pollution control board.
All other provisions, stipulations and conditions in Direction No. 98 remain unchanged. The Delhi industrial PM limit amendment is an extension, not a relaxation of the limit. No later CAQM extension or correction was identified by 4 August 2026.
Summary
The Delhi industrial PM limit of 50 mg/Nm³ now applies to all covered industries from 1 October 2026. Operators should finish air-pollution control upgrades, reserve laboratory capacity and verify stack performance. The amendment changes timing only, leaving other Direction No. 98 conditions and any stricter site-specific requirements in place unchanged.
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