You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Respirable dust, responsible for pneumoconiosis, has a size limit of: and explain in detail?
Pneumoconiosis occur due to occupational exposure to dust. Paicles size 0.5 to 3.0 microns are the most dangerous (as a health hazard causing pneumoconiosis), as they reach the interior of lungs with ease. Paicles size and behaviour: Paicle size Behaviour >10 microns Settle down by gravity <10 microns Remain suspended in air 5-10 microns Arrested in upper respiratory tract 3-5 microns Deposited in mid respiratory tract 1-3 microns Enter alveoli and settle there (cause pneumoconiosis) <1 more Brownian movement Ref: Park 25th edition Pgno: 843