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Will mold grow when humidity rises above 50%

Several mold species have been associated with asthma, including Alternaria, Cladosporium, Aspergillus and Penicillium.  Humidity levels above 55 percent can allow mold to grow, although levels of 70 percent are more ideal for mold growth. Keeping your house air conditioned in warm climates can help keep the humidity levels safe from mold. But not if you set your air conditioning at 90 degrees.