| 1990
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| the first governmental resolution about radon (No. 150, May 1990)
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| the first proposal of the uniform method for radon risk classification of foundation soils
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| radon maps in scale 1:200 000
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1991
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| the acceptance of the Decree of the Ministry of Health of the C.R. on the requirements for limiting radiation exposure due to radon and other natural radionuclides (No. 76/1991)
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|  action level 200 Bq/m3 (EEC) for existing houses
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| guidance level 100 Bq/m3 (EEC) for new buildings
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| preventive investigation levels, 226Ra in building materials and 222Rn in supplied water
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| the governmental resolution about the purchase and remediation of START houses (building materials with higher content of 226Ra - No. 520, December 1991)
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| guidelines of the Ministry of Finance - the rules for purchasing and supporting remediation activities
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| the complete set of uniform measurement methods
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1993
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| the governmental resolution supporting the search for high radon houses and remediation in schools and action on water supplies (No. 709, December 1993)
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1994
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| the modification of the origin proposal of the classification method for radon risk classification of foundation soils
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1995
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| the competency in the field of radiation protection transferred from the Ministry of Health to the State Office for Nuclear Safety (the Law No. 85/1995)
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| Czech National Standard CSN 73 0601 Protection of houses against radon from the soil
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1997
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| the Atomic Law (No. 18/1997) - with the regulation and control of all possible radon sources
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| the Decree of the State Office for Nuclear Safety No. 184/1997 on requirements of radiation protection
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| Czech National Standard CSN 73 0602 Protection of houses against radon and gamma radiation from building materials
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1998
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| the modification of methods for indoor measurements and radon diagnostic
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1999
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| the governmental resolution about radon programme (No. 538, May 1999)
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2002
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| the modification of the Atomic Law (No.13/2002)
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| the new Decree of the State Office for Nuclear Safety No. 307/2002 on radiation protection
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| action level 400 Bq/m3 (radon concentration in air) for existing houses
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| guidance level 200 Bq/m3 (radon concentration in air) for new buildings
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| guidance level 1000 Bq/m3 (radon concentration in air) for workplaces
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| the proposal of modification of the uniform methods for radon risk classification of foundation soils
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2004
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| the new uniform method for radon risk classification of foundation soils
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2005
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| the modification of governmental rules for purchasing and supporting remediations activities
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| the modification of the Decree of the State Office for Nuclear Safety No. 307/2002 on radiation protection
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2009
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| the new governmental resolution about radon programme (No. 594, May 2009) and the Action plan for the period 2010 - 2019
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