Radon in Hangzhou
Zhejiang, China
Geological Context
Location and surrounding area
No official radon classification is available for this municipality.
What the regulations require
Dwellings
National standard GB/T 18883-2022: maximum acceptable level 300 Bq/m³ for indoor radon (annual average).
Workplaces
Building technical standard GB 50325 establishes 300 Bq/m³ for interiors. No distinction made between homes and workplaces in public regulations.
Professional services in Hangzhou
Qualified Testing Agencies
Government-certified organizations for indoor air quality testing including radon under GB 50325
Radon Measurement Companies
Private companies specializing in radon concentration measurement in residential and commercial buildings
Government-Affiliated Laboratories
Government research institutions under provincial or municipal environmental bureaus for radon monitoring
What should you do?
Regardless of the official classification, the only way to know the radon level in a specific building is to measure it. A long-term test (at least 3 months) is recommended. You can either test yourself with passive detectors or hire a certified professional.
FAQ
What does the radon potential classification mean?▾
The radon potential indicates the likelihood that buildings in this area will have elevated radon levels, based on geological and measurement data from official authorities. It does not predict the level in any individual building.
Is measurement mandatory here?▾
It depends on the national regulations and the type of building. In priority action zones, measurement is often mandatory for workplaces and public buildings. For dwellings, measurement is generally recommended. Check the obligations section above for details specific to this country.
What should I do if the level is above the reference level?▾
If your long-term measurement exceeds the national reference level, mitigation measures such as sub-slab depressurization, sealing or improved ventilation can reduce radon levels significantly. Contact a qualified radon professional.