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Human race and its relation with sun are known from ancient times. The controlled and efficient uses of sunlight exposure have enormous use in day to day life and medical sciences. In recent past natural and anthropogenic activities have changed the scenario of optimality. The tremendous increase of green house gases affects globally the surface temperature of the earth and chemically active species have changed the concentration of Ozone in the atmosphere. The exposure of UV-B radiation after the threshold can cause many diseases like skin cancer and eye damage. But its controlled exposure of UV-B radiation can prevent a number of very common and often fatal heart diseases breast cancers, colon cancer, prostate, ovarian cancer and multiple sclerosis etc. Hypertension is the most important risk factor in cardiovascular disease. In this paper an attempt has been made to correlate the erythemal flux concentration with the spreading of cardiovascular diseases. The disease is affected more locally with the living and climatic conditions of the region or area. Erythemal Climatic Index (ECI) has been generated with the help of erythemal flux concentration, temperature, of sun exposure and humidity, Wind and the health status (in terms of LDL or HDL) among adults (20-50 years). In the preliminary stage, this methodology is tried for Meerut City (28.5 0N, 77.00 E). It has been observed that, during peak summer (Moist or Humid) or winter (Chill) the frequency of heat stroke is more with the age groups (45-50) followed by 40-45, 35-40, 30-35, 30-25 and 25-20. ECI and erythemal flux both shows increasing trend for summer (March–May) and …