There are whole books published about using bees as biomonitors.  The bees themselves, wax, honey, pollen, propolis.  Of these, the lowest residue chemicals of all but water soluble chemicals are found in honey - that's the good news.

Worry about consuming propolis because of organics, you don't want to read about the 200+ volatile and semi-volatile chemicals in the air inside any beehive, the organic and inorganic (heavy metals like arsenic, cadmium, zinc) chemicals in all of these components, nor the radionuclides that showed up every time the Chinese did atmospheric testing of nuclear arms years ago or the huge spike worldwide after Chernobyl melted down.

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