[The study of the characteristics and influencing factors of pneumoconiosis among workers exposed to dusts in an iron mine].

Objective: To analyze the prevalence characteristics and influence factors of pneumoconiosis of workers exposed to dusts in an iron mine, to provide the base of preventive measures for pneumoconiosis of iron mine.

Methods: The subjects of cohort study were all workers exposed to dusts for at least one year registered in an iron mine during 1960 to 1974, and followed-up to the end in 2003. The cases with pneumoconiosis were diagnosed by the local diagnosis group of pneumoconiosis, according to the national diagnostic criteria of pneumoconiosis.

[The analysis of adverse health effects of occupational hazards factors in one solid waste landfill].

Objective: To determine occupational hazards in work sites of a large solid waste landfill and analyze their adverse health effects.

Method: The national standardized detection methods were used to determine dust concentration, harmful gas and physical factors in worksites. Routine physical examination, pulmonary function, hearing tests and nervous system test were performed in workers for 2 consecutive years.

[Experimental research on biological responses of productive dusts from pottery factories and tungsten mines].

Objective: To assess biological response and health adverse effects of industrial dusts from pottery factories and tungsten mines on alveolar macrophages (AM) in vitro.

Methods: AM acquired from bronchoalveolar lavage of guinea pigs were used as the target cells. AM were then co-cultured with respirable dust particles (15, 30, 60 and 120 μg/10⁶) from pottery factories and tungsten mines.

[Effect of humidity and temperature on filter and gravimetric measurement of ambient particulate matter in a balance room].

Objective: To assess the effects of the alteration of humidity and (or) temperature on weight of filters without and with ambient particulate matter in a balance room.

Methods: The mass of blank dust sampling filters were weighed under (18 +/- 1) degrees C and (28 +/- 1) degrees C respectively, with the humidity varying from 35% relative humidity (RH) to 100% RH in a balance room. Then the blank filters were divided into two groups and were used to sample total dust and respirable dust.