Office of Environmental Health Hazard Assessment (OEHHA) organized human health studies, which found relationships between higher temperatures and adverse health effects such as
• Death and illness 
• Hospital visits 
• Emergency room visits 
• Birth defects.   
As a result, the focus was on heat-related effects by restricting our data to the warm season in California over several years. Discussions about the methodological issues in examining the health-related effects due to temperature and air pollution were conducted. 2 types of human health studies were used to conduct the research on the adverse effects of temperature
Studies have helped identify groups who are vulnerable to heat-related effects.
For analysis data was used from public utility records, where we examine variables such as
• daily air pollution levels 
• race/ethnicity 
• age 
• higher education level 
• disease type or subgroup 
• underlying cause of death 
• date of effect occurrence 
• Zip code or county of residence. 
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