Cr(VI) can be found mainly in the form of oxides like chromate and dichromate. In solid form these are found as salts like potassium chromate and potassium dichromate. For example, potassium dichromate is in crystallic form but can also form thin powder and be present in the air. Strict health and safety measures should be taken when working with Cr(VI) compounds as it is a suspected carcinogen and the acute and chronic exposure to Cr(VI) is regulated in many countries. If you have these salts in aqueous solutions you should also take measures to avoid inhalation of any vapors produced as these can also be hazardous to health. Of course, it all depends on the exposure intensity and time.
Chromium is present in cement and is used as paint pigments and dyes, as a catalyst, to make magnetic tape, in tanning, and in wood impregnation as a wood preservative. So, depend on its use in different processes it can be airborne (volatile) and find in the air. Generally, chromium is found in nonindustrial environments in air at 10ng/m3.
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