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Context of research: In recent years there has been global warming that causes climate changes and severe natural phenomena. Inside the cities the warming is increasing and this is how the phenomenon of urban heat island was created. In our research, we check which surface should be used to mitigate these phenomena, and to result in a lower temperature being emitted from the ground. Research question: What is the connection between the type of ground cover and the temperature of the infrared radiation reflected from it? Objectives set: We will measure different surfaces inside our urban school and examine which surface is better to use in terms of heat emission. Brief methods description: We measured three surfaces across the school: concrete, soil and astroturf (synthetic grass) exposed to the sun. Results: synthetic grass (astroturf) reflects the most infrared radiation, concrete which reflects less, and soil reflects the least radiation. Conclusions: synthetic grass (astroturf) causes environmental warming, compared to concrete which reflects less radiation, and soil which reflects the least radiation meaning it protects better against environmental warming. Recommendations for a way forward: check where it is possible to replace surfaces within the city, and plant more trees that will provide shade, to lower the returned temperatures. Keywords that emphasize key ideas in the paper: Temperature, surface, urban heat.