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Emission Standards for Brick Kilns



Brick production is a very large and long-established industry in India. The brick sector in India, which is not governed in a proper way or as per the guidelines of central government/state government, although, is tremendous in size. India is the second-largest brick producer in the world. Now, it is an established fact that brick industries in some parts of India are one the major contributors of air pollutants in the environment. The brick kiln industry is an established or demanding industry as the demand for bricks is increasing almost universally due to fast economic growth. Most of the brick kilns use Assam coal, Slack coal, and/or lignite which contain a high level of sulphur and high ash content, about 70 % of coal, 24% sawdust, and the remaining 6% wood, and others are used fuel by brick kilns.

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Types of Brick Kilns

  1. Hoffman Kiln
  2. Bull’s trench kiln
  3. Down-Draft kiln
  4. Vertical  shaft kiln

Sources of Emission

  1. Stack Height
  2. Fugitive Emission
    • During charging of fuel
    • Crushing of coal
    • Clay excavation
    • Loading and Unloading of Bricks
    • Laying and removal of dust/ash layer over brick setting
    • Cleaning of the bottom of trench/side flues
    • During high winds

For more details, please visit Kilns.PDF

In exercise of the powers conferred by section 6 and 25 of the environment (Protection) Act1986 (29 of 1986), the central government makes a rule for the Brick Kiln.

Emission Standards for Brick kilns:

Industry ParameterStandards Standards
Emission Standards
Brick Kilns Bull’s Trench Kiln (BTK)
Particulars Category Limiting concertation in mg/Nm³
Particular matter
  • Small
  • Medium
  • Large
  • 1000
  • 750
  • 750
Minimum (meter)
Stack height
  • Small
  • Medium
  • large
  • Trench width(m)
  • 22 or induced draft fan operating with minimum draft of 50 mm WG with 12-meter stack height.
  • 27 or included draft fan operating with a minimum draft of 50mm WG with 15-meter stack height
  • 30 or included draft fan operating with minimum draft 50 mm WG with 17-meter stack height.
  • Production   ( bricks/day)
Small BTK <4.50 Less than 15000
Medium BTK 4.50-6.75 15000-30000
Large BTK Above 6.75 Above 30,000
Down-Draft Kiln (DDK)
Particulars Category Limiting Concentration in mg/Nm³
Particulate matter Small/large/medium 1200
Minimum (meter)
Stack height
  • Small
  • Medium
  • Large
  • 12
  • 15
  • 18
Particulars Category Production(bricks/day)
  • Small
  • Medium
  • Large
  • Less than 15000
  • 15000-30000
  • Above 30000
Vertical Shaft kiln (VSK)
Particulars Category Limiting Concentration in mg/Nm³
Particular matter Small/large/medium 250
Minimum (meter)
Stack height
  • Small
  • Medium
  • Large
  • 11 (at least 5.5 m from loading platform)
  • 14 (at least 7.5 m from loading Platform)
  • 16 (at least 8.5m from loading platform)
Category Number of shifts Production (bricks/day)
  • Small VSK
  • Medium VSK
  • Large VSK


  • 4-6
  • 7 or more
  • Less than 15000
  • 15000-30000
  • Above 30,000

For more information about Delhi Pollution Control Committee (DPCC) Click here Delhi Pollution Control Committee

For more information about State Pollution Board Click here State Pollution Board


  1. Gravitational Settling Chamber Along with Fixed Chimney of appropriate height shall be provided for all Bull’s Trench Kilns
  2. One chimney per shaft in Vertical Shaft Kiln shall be provided. The two chimneys emanating from a shaft either be joined (at the Loading Platform in case of the brick chimney or at the appropriate level in case of the metal chimney) to form a single chimney.
  3. The above standards shall be applicable for different Kilns if coal, firewood and/or agricultural residues are used as fuel

This portion of the site is for informational purposes only. The content is not legal advice. The statements and opinions are the expression of author, not corpseed, and have not been evaluated by corpseed for accuracy, completeness, or changes in the law.


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