The effect of low-level ozone concentrations on the serum levels of immunoglobulins, alpha-1-antitrypsin and transferrin and on the activation of peripheral lymphocytes.

Long-term exposure (2--9 years) to ozone levels exceeding the Czechoslovak value of mean maximum allowable concentration (0.1 mg . m-3) turned out to induce changes in the exposed persons which can be characterized as initial immune disorders.