1975 Yant Memorial Lecture New aspects on dust and pneumoconiosis research.

This lecture deals with pneumoconiosis, in particular with fibrotic tissue reactions caused by SiO2 and asbestos dusts in the lungs. The term "fine dusts" is defined in connection with the setting up of MAC-values. The aerodynamical diameter of particle shaped and fibrifom dust is set forth. Results of the fundamental research with SiO2, Coal mine and asbestos dusts in animal and cell experiments are explained.