The evolution in time of a nanoparticle (NP) aerosol released into a simulated workplace environment was investigated for different starting scenarios including (i) NP release into a particle-free atmosphere and (ii) release in presence of a pre-existing background aerosol. In each case, particle number distributions and total number concentrations in a 2 m(3) aerosol chamber were monitored ove...

The purpose of this study is to describe the personal exposure to respirable dust and quartz and in stone crushing units located at west of Iran. A size of 40 personal samples and 40 stationary samples were obtained and analysis was done by X-ray diffraction (XRD). The results of personal sampling were shown the concentrations of respirable dust exposure level in workers of process, hopper and ...

Although crystalline silica has been recognized as a health hazard for many years, it is still encountered in many work environments. Numerous studies have revealed an association between exposure to respirable crystalline silica and the development of silicosis and other lung diseases including lung cancer. Alberta Jobs, Skills, Training and Labour conducted a project to evaluate exposure to c...

With the large-scale outbreak of COVID-19, people have gradually realized importance bioaerosols in environment, and how to efficiently filter out microbial aerosols air, so as create a safe healthy air environment is urgent. The non-bacteriostatic F6 non-woven material synthesized new reduced graphene oxide were tested analyzed this paper, filtration performance against bacterial atmosphere at...

BACKGROUND Inflammatory airway disease (IAD) in horses is a widespread, performance-limiting syndrome believed to develop in response to inhaled irritants in the barn environment. OBJECTIVES To evaluate changes in bronchoalveolar lavage fluid (BALF) cytology and exposure to particulates, endotoxin, and ammonia during horses' first month in training. ANIMALS Forty-nine client-owned 12- to 36...

SUMMARY BACKGROUND This is the first study in Ghana in the Obuasi gold mines where the silica content of the respirable dust is 10%, less than in previously studied gold mines, with only 23% of the miners having ever smoked. OBJECTIVES The study was to assess the prevalence of respiratory impairment in the Ghanaian gold miner and to quantify the effects of the respirable dust on pulmonary fun...

When bacteria are disseminated into air, the concentration of viable cells in the aerosol decreases with time. It has been shown that part of this loss is due to impingement of cells on the surfaces of the container and to settling, but there is also considerable evidence for biological inactivation (Lester, 1948; Dunklin and Puck, 1948; Boyd and Forstat, 1953). This study has been undertaken t...

Prior research has suggeste d that the source of respirable silica dust in underground coal mines is typically the immediate top or bottom lithology adjacent to the mined seam, not mineral matter bound within the mined coal bed. Geochemical analyses were applied in an effort to identify the specific source rock of respirable quartz dust in coal mines. The analyses also demonstrate the compositi...