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To prevent and treat the early hearing loss of firefighters caused by occupational noise sources，the occupational noise exposure detection for firefighters was conducted，and the degree of hearing loss in firefighters was evaluated. The ratio of hearing loss in firefighters was quantified，and the relationship between the hearing test results of firefighters and occupational noise exposure was analyzed. The results indicate that the intensity of the noise source for firefighters exceeds the exposure limit of noise levels in the workplace of 85 dB(A). Among the hearing screening results of 50 firefighters，the number of people who falisd the distortion product otoacoustic emission hearing screening in both ears is 21，accounting for 42.0%，and the pass rate is significantly lower than that of normal individuals. The number of people with left/right ear pure tone audiometry hearing thresholds ≥ 26 dB is the greatest at 6 kHz，accounting for 30.0% and 26.0% at n =15 and n =13，respectively，suggesting high-frequency hearing loss in firefighters after occupational noise exposure.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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