An ozone detector in the form of two basic embodiments which can measure ozone concentration in ambient air at 0.001-1 ppm. The first embodiment includes a stretched elastic material and a standard which can give ozone concentration in response to degree of microcracking or frosting of the elastic material. The second embodiment includes a chamber containing a long strip of elastic material, a component for stretching the material, a light source for generating a light and illuminating the film and a detector for detecting reflected, transmitted through or scattered light by the material.
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