Outside of a lack of trees community health experts with Kaiser Permanente said there are many more reasons that have marginalized communities feeling the heat more than others. Living in an area with a lot of pavement and buildings called "urban heat islands" absorbs that heat, and re-emits it making it hotter. Lack of housing with insulation and air conditioning is another problem. Also, marginalized groups often have higher risks of heart disease, asthma and COPD that become worse with the heat. Health experts said it's all a mix of factors that weave into one another. Everyone should know what health conditions they have and that those conditions could get worse in high temperatures, so the warning to everyone to keep yourself cool if you can.