Health and work safety (Bezpečnost a ochrana zdraví při práci) (HSW)
What
An employee is entitled to refuse the performance of work which reasonably concerned may immediately and seriously threaten life or health, or the life or health of other persons.
Who
Employee or employer.
Good to know
The employer is controlled by state authorities. You can make a complaint to these bodies (Czech, English, French, Spanish and Russian):
http://www.businessinfo.cz/en/psc/run-your-business/health-and-safety-obligations.html
Where
(Czech, English, German, Polish, Bulgarian, Romanian, Vietnamese and Russian): http://www.suip.cz/english-documents/
Attention
If you fail to comply with your obligations in the area of HSW, you are at risk from being dismissed and being obliged to compensate your employer for damages!