{'fraction_non_alphanumeric': 0.016037735849056604, 'fraction_numerical': 0.0, 'mean_word_length': 4.766304347826087, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
THE PULMONARY RESPONSE TO COAL DUST

The term “coal dust” is often used to categorize the dust to which coal miners are exposed. This characterization is, of course, incorrect. The correct designation is coal mine dust. The latter includes dusts from pulverized rocks associated with the coal and from traction sand. Some of these dusts may be fibrogenic, such as those containing crystalline silica or certain silicates or both. It can therefore be anticipated that the tissue reaction to coal mine dust will vary according to its composition. The character and the amount of the coal mine dust inhaled may not, however, be the only determinants of the nature and severity of the tissue reaction evoked by its presence. The status of the host tissues may profoundly alter their response to coal mine dust deposits in the lungs. Because of these variables, the tissue response to coal mine dust may logically be categorized according to the immunological status of the host tissues and also according to the presence of significant amounts of fibrogenic dusts.