The government regulation No. 92/96 – by which it is realized the Act of the Parliament No. 309/1991 Code of Law about air protection from pollutants – establishes emission limits to solid pollutants for single sources valid from 1st January 1999 in the supplement No. 4. From this viewpoint it is necessary to comply with the requirements of law. There are various possibilities of solution, basically two ways: 1. modification of boilers for solid fuels and application of separating devices of solid pollutants with sufficient regulation, 2. change of heating medium (coal) to gas or substitution of gas boiler by cogeneration units, resp. steam-gas cycles. The author deals also with different conceptions of separation the solid and fluid materials from stable sources (filters, electro separators and cycle separators with intensification).