Image source: https://pubfiles.pagasa.dost.gov.ph/iaas/heat_index/highestheatIndex.png
According to the World Health Organization (2018), sudden increases in heat due to exposure to hotter-than-normal temperatures can impair the body’s capacity to regulate its temperature. This will lead to heat cramps, heat exhaustion, heatstroke, and hyperthermia with the following symptoms: unconsciousness, confusion, and seizure.
As temperatures continue to rise around the world, we are experiencing a higher heat index that is affecting our communities in many ways. Heat index, as defined by the National Weather Service of the National Oceanic and Atmospheric Administration, is what the temperature feels like to the human body when relative humidity is combined with the air temperature. It means that as the air temperature and relative humidity increase, the heat index also increases. Extreme heat can have a significant impact on people’s health, safety, and overall quality of life. This is especially true in urban areas, where high concentrations of buildings and pavement can create an urban heat island effect.
Health Effects
A higher heat index can cause a variety of health problems, including heat cramps, heat exhaustion, and heat stroke. These conditions can be especially dangerous for vulnerable populations, such as the elderly, children, and people with chronic illnesses. Heat-related illnesses can lead to hospitalization or even death, and the risk increases in areas without access to air conditioning or other cooling measures.
Safety Concerns
A higher heat index can also create safety concerns, such as an increased risk of wildfires and power outages. Extreme heat can cause power grids to become overloaded, leading to blackouts or brownouts. This can be dangerous for people who rely on electricity for medical equipment or cooling.
Quality of Life
Extreme heat can also affect people’s quality of life. It can lead to decreased productivity and increased absenteeism in the workplace and in schools. It can also limit outdoor activities and exacerbate existing social inequalities. For example, people who live in low-income neighborhoods may have less access to green spaces or air conditioning, putting them at greater risk during extreme heat events.
Why Trees Are Essential?
Trees play a critical role in mitigating the effects of higher heat index in urban environments. They provide shade, which can reduce temperatures by up to 12 degrees Celcius. They also release water vapor through a process called transpiration, which helps cool the air around them. Trees also reduce the urban heat island effect by absorbing and reflecting sunlight, rather than storing it as the concrete and cements in buildings and pavements do.
Additionally, trees have a positive impact on mental health and well-being. They provide aesthetic value and can create a sense of community and connection with nature. Studies have shown that spending time in nature can reduce stress and improve mood, which can have a ripple effect on overall health and productivity.
As we continue to experience higher heat index, it is essential that we prioritize strategies to mitigate its effects, particularly in urban environments. Trees are a critical component of these strategies and provide numerous benefits beyond temperature reduction. Investing in green spaces and urban forests can have a significant impact on the health, safety, and well-being of our communities.
Morales and Osea, 2018
