Resumen
Applying the concept of effective temperature (ET), a scenario of human bioclimatic conditions for Mexico City is presented by using results from both GCM regional predictions for C02 doubling and temperature trend projection from an urban station. Current and future bioclimatic maps for Mexico City and its conurbation are presented. Current environmental conditions will likely change toward a warmer atmosphere due to both the urbanization process and global greenhouse effect. The impact on the population will be more important during the warm season (March-May) when the bioclimate of the city will likely shift away from current neutrality to the next comfort scale category (ET 24-27ºC) of warm conditions covering most of the capital city.