Health Risks to the Russian Population from Weather Extremes in the Beginning of the XXI Century. Part 1. Heat and Cold Waves

This literature review summarizes the results of international studies conducted by WHO, WMO, EU, and other organizations, in the areas of assessment of climate change-induced urban health risks, and development of action plans for adaptation of public health care and other public governance bodies to climate change. The results of studies of the relationships between heat waves, cold spells, and mortality rates conducted in Russian cities have also been critically reviewed. The study cites included the largest cities (Moscow, Saint-Petersburg, etc.) situated in various climate zones: Arctic, South European part of Russia, continental and monsoon climate zones. These studies showed that heat waves in the cities with moderately continental climate typically lead to greater increases in all-cause mortality rates than cold spells, relative to the cities located in other climate zones. At the same time, the health impacts of cold spells were more pronounced than those of heat waves in the north cities, which was not observed in the Russian South or Middle Siberia cities. On average, cold spells are characterized by greater health risks in the north cities than in the south cities. The values of the 3rd and 97th percentiles of long-term distributions of daily mean temperatures can be used as the threshold values for hazardous cold and heat waves. The health action plans should be activated when daily mean temperatures fall below the cold threshold, or exceed the heat threshold. The values of temperature thresholds depend upon local climates and are similar to hygienic standards. Russia has adopted a National Plan for adaptation to health risks induced by climate change. This plan includes the measures specifically aimed at reductions of excess mortality during heat waves and cold spells. The National Plan prescribes that similar plans should be developed for all administrative subjects of the Russian Federation. Implementation of heat wave (or cold spell) early warning systems in combination with other preventive measures can effectively reduce the numbers of excess deaths during extreme weather events.