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This is because certain tree species and arrangements can block airflow, trapping pollution.

It’s to do with the way his brain processes the nuances of airflow.

Perry, who was found dead in a hot tub at his home in Los Angeles, suffered from diabetes and chronic obstructive pulmonary disease, which can cause airflow blockage and breathing-related problems.

Chronic obstructive pulmonary disease “is a chronic inflammatory lung disease that causes obstructed airflow from the lungs,” the Mayo Clinic says.

The fish is then hung in refrigeration with plenty of airflow for 7-9 days depending on the species.