The resulting statistics are usually produced using national and subnational data. They include descriptive epidemiological data that can usually be updated yearly. The WHO is making remarkable progress in developing methodologies needed to estimate the attributable fraction78 and burden of disease attributable to the environment.79 It has also formulated comprehensive indicators and indexes such as DALY (disability-adjusted life year),80 which is a summary measure of population health problems combining morbidity and premature death associated with different factors related to the modifiable environment.81 However, caution must be exercised when producing these types of environmental health statistics because health and environmental problems are multifaceted and complex.