Five levels of odor: <br>no <br>odor ; slight odor but perceptible; <br>odor, but no discomfort; <br>strong discomfort gas; <br>irritating discomfort gas.
Five levels of odor:<br>No odor;<br>The smell is slight, but it can be felt;<br>Smell, but no discomfort;<br>strong discomfort gas;<br>Irritating discomfort gas.
Five levels of odor:<br>No smell;<br>The smell is slight, but can be felt;<br>Smell, but no discomfort;<br>Strong discomfort gas;<br>Irritating discomfort gas.