Air Pollution and Allergens, 15 microscope slides

4590 Our Environment Part IV. Air Pollution and Allergens. - 15 Microscope Slides - 1. Pollen grains of different kinds of grass 2. Pollen grains of different deciduous trees 3. Pollen grains of different conifers 4. Mixed house dust 5. Dust mite from a living room 6. Spores of different fungi 7. Wood powder 8. Asbestos powder (cancerogenous) 9. Talcum powder 10. Crystals of washing-powder 11. Polyamide fibres 12. Nylon fibres 13. Mucous membrane of human nose, t.s. 14. Healthy human lung, t.s. 15. Human lung injured with dust particles, t.s.