How to Prevent Asbestos Particles from Scattering during Demolition Works etc.

Hyogo Prefectural GovernmentAgricultural & Environmental Affairs DepartmentEnvironmental Management BureauWater & Air Quality Control DivisionAir Group Assistant Director Sugano Hiroki 菅野　浩樹

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Asbestos types

Chrysotile Amosite Crocidolite

Source: THE ASBESTOS/Sekimen Tokuhon (1996 Japan Asbestos Association)

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Beginning of asbestos regulation according to the prefecture ordinance

(1) Background　　 Tons of asbestos are thought to have been released into the air during and after

the Great Hanshin Awaji Earthquake. The concern of the air pollution led to the introduction of regulation system for the prevention of scattering dust & asbestos by Hyogo prefecture prior to the national government

(2) Progress July 18, 1995 Revise “Ordinance on Conservation and Development of the

Environment”　 Jan. 17, 1996 Commencement(3) Contents　・ Give the duty to submit notification on execution of demolition work of special

structures　　 (target) 1) demolish work of structure with total floor space of demolition exceeding

1,000m2

　　　　　　 2) demolish work or renovation of structure using special materials containing asbestos (spraying asbestos or heat retaining material)

　・ Comply with the dust & asbestos scattering prevention standard　 ・ Give recommendations or orders when the standard is not met, establish

necessary penal provisions when violation of order is observed and make an on-the-spot inspection

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Strengthening of regulations by revision of ordinance

(1) Background　　 Health damage of the surroundings of asbestos products

manufacturing plant became an issue. The suspected threat of scattering of asbestos when structures containing non-scattering asbestos are demolished led to the strengthening of regulations

(2) Progress　・ On November 1, 2005 “Ordinance on Conservation and

Development of the Environment” was revised and regulation was strengthened.

(3) Contents　・ Add the target for regulation　 (Target)　　 3) Demolition work of structures when the total floor area of demolition exceeds 80m2 or more and use asbestos containing materials as well 　　

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Regulation under the Law

○May 9, 1996 Revision of Air Pollution Control Law

　 Any demolition, renovation or modification work of structures meeting certain requirements of using spraying asbestos requires advance reporting. Obedience of the operation standard is stipulated ( Enforced on April 1, 1997 )

○December 21, 2005 Revision of the Order for Enforcement 　　 Add insulating materials, heat retaining materials and fireproof coating

materials containing asbestos as special construction materials. Eliminate conditions like scale for special dust removal work etc.

( Enforced on Mar. 1, 2006 )

○August 11, 2006 Revision of Act

　 Require prevention measure against scattering generated in demolition work of construction using asbestos ( Enforced on Oct. 1, 2006 )

○June 21, 2013 Revision of Act

　　 Strengthen prevention of scattering standard etc. ( June 1, 2014 )

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Regulation of demolition containing asbestos

Scattering asbestos

Spraying asbestos etc.

Non-scattering asbestos

Molding plates containing asbestos

No use of asbestos

No condition for scaleFloor space

less than 80m2

Floor space more than 80m2

Floor space more than 1,000m2

Demolition & Renovation work of structures & construction Demolition work of structures

Air Pollution Control Law

“Notification on special dust removal work”

Ordinance on Conservation and Development of the

Environment

“Notification on execution of demolition work of special

structures”

Ordinance on Conservation and Development of the

Environment 　

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Countermeasures for preventing scattering of asbestos (1)

　　

　　　　吹き付けアスベスト　　　　　　　　　　　　　　　作業現場出入口での試料採取

◇ 　隔離工法概念図Schematic of isolation work method

Spraying asbestos Sampling at the entrance of work site

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Countermeasures for preventing scattering of asbestos (2)

　　

Workplace (isolated area)

Dust collection / exhaust device

Fron

t room

① W

ash

ing

ro

om

Chang

ing

room

Micro

diff

ere

nti

al p

ressu

re

gaug

e

Smoke tester

Check by measurement“before work”“at the beginning of work”&“during work”

Particle counter

Digital dust monitor

・ Regularly confirm that the negative pressure condition is maintained using the Microdifferential pressure gauge in the changing room (At least once/day)・ Confirm the air flow from the changing room to the removal workplace using either a smoke tester or a windsock

Security zone

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Thank you for your kind attention