A growing number of people have recently contracted allergic diseases caused by pollen because of climate change. The seasonal variations in pollens have occurred with the increased sensitization rate to pollens in children as well as in adults. Allergic plants which are rapidly proliferating have emerged as a dangerous element for allergic children. Plants causing allergies are strongly proposed to be due not only to the rapid proliferation of weeds and trees but also to air pollution such as greenhouse gases as well as increased temperatures resulting from climate change. As an altered climate affects the range of allergenic plant species and the length of the pollen season, a number of studies have shown that increased CO2 levels and atmospheric temperature raise pollen concentration as well as increased allergenicity of pollens with duration of the extended pollen season. Weather variables with CO2 levels are among the main factors affecting phenology and pollen production. Weather patterns influence the movement and dispersion of all aeroallergens depending on atmospheric stability. Otherwise, the atmospheric fungal concentrations decreased annually for 25 years. The intensity of precipitation during the summer and autumn increased, but the number of days with precipitation decreased throughout the seasons. Even though there was an increase in precipitation, it was concentrated over a short period of time. These changes may have augmented dry season duration, which reduced the sporulation period for fungi. Allergenic fungal sporulation could decrease with climate changes in future. There is shown reverse phenomenon between increased allergic pollens and decreased fungi amounts annually with allergic sensitization rate to them. It is yet unknown whether complex interactions with pollens, fungi, meteorological variables, and air pollutants in the changing environment. It is crucial to eliminate the associated risk for human health in future and take appropriate measures to reduce it.