4,389,903 (Bertone et al.) wherein a filter unit is clipped to the collar of a miner or other worker and is connected by a conduit to a pump housed in a unit clamped to the belt of the worker. One example of such a sampling arrangement is disclosed in U.S. Presently, breathing zone sampling is carried out using an open-faced filter assembly that clips to the lapel of a worker. The present invention relates to sampling devices for sampling the air in environments which are suspected of being contaminated with airborne toxic particles.Īn accurate evaluation of the exposure of a worker to concentrations of toxic airborne particulate material requires a sampling technique which produces a representative sample of the airborne particulate concentration existing in the air actually breathed by the worker.

In combination with a pair of eyeglasses, a sampling device for sampling the air in the breathing zone of a wearer of the eyeglasses, said sampling device comprising sampling means, supported on the frame of said eyeglasses and extending into the breathing zone of a wearer of the eyeglasses, for obtaining samples of the air in the area of the nostrils of a wearer of the eyeglasses, wherein said sampling means comprises a pair of transport tubes extending downwardly from said frame and having sampling inlets adapted to be disposed in close proximity to the nostrils of a wearer of the eyeglasses to simulate the position of the nostrils of the wearer of the eyeglasses so that a representative sample of air breathed by the wearer of the eyeglasses can be taken without obstructing the flow of air into the nostrils of the wearer of the eyeglasses, a filter means connected to said sampling means for filtering out particulate matter contained in the air sampled by said sampling means, and pump means connected to said filter means for drawing air into said sampling means through said filter means. A sampling apparatus comprising sampling means for sampling air in the breathing zone of a wearer of the apparatus and support means for said sampling means comprising a pair of eyeglasses including a frame said sampling means comprising a sampling tube supported on the frame of said eyeglasses and including a main body portion and a pair of sample transport tubes connected to said main portion and suspended, in use, therefrom centrally of said frame so as to be disposed on opposite sides of the nose of the wearer in close proximity but spaced therefrom so that a representative sample of air breathed by the wearer can be taken without obstructing the flow of air into the nostrils of the wearer, said transport tubes each including an inlet therein which, in use, is disposed adjacent to a respective nostil of the nose of the wearer a filter holder connected to said main body portion of said sample tube a filter removably mounted in said filter holder for filtering out particulate material in the air sampled by the apparatus and means for connecting the sampling apparatus to a pump for drawing air into the apparatus through said inlets so that the air passes through said filter.Ģ.

The breathing zone