air pollution may influence the frequency of mental disorders. This was the result of a study with health and environmental data from the USA and Denmark. The scientists Atif Khan and Andrey Rzhetsky of the University of Chicago found in regions with particularly poor air quality, increased case numbers for bipolar disorders, and other diseases, as they report in the journal “PLOS Biology”.

For the United States, the researchers analysed data from health insurance for 151 million people. They investigated the prevalence of four psychiatric disorders ‑ bipolar disorder, severe Depression, personality disorder and schizophrenia) and neurological diseases, epilepsy and Parkinson’s disease.