Farmer's pesticides exposure health risk assessment (HRA) needs a classification methodology of pesticides to be done. This methodology can be based on toxicological effects of pesticides, but also on practical criteria e.g. availability of dosages methods, the usage of the products by farmers, and regulatory laws. Among the toxicological data available, carcinogenicity of pesticides appeared as a decisive share of chronic exposure to pesticides for farmers. Indeed framers are lifetime exposed to pesticides, and carcinogenic effects are often take years to develop. Besides possible sanitary effects linked to farmer's chronic exposition to pesticides are highlighted by epidemiological studies. These studies show an increase risk of some cancers in the farmer's population, especially blood cancers. For this reason it is necessary to focus studies on carcinogens pesticides and exposure among farmers, this requires a selection methodology of pesticides and population. The studies conclusions of exposition to pesticides often lack of relevance in particular because the risk for operators health is not evaluate. Studies often note an exposition to pesticides but this exposition is rarely compared to RfD (reference doses) or AOEL (Acceptable Operator Exposure Level) in order to assess and characterized the risk. The risk characterization can indicate the acceptability of it for the operator. This can be done by measure the exposition (e.g by human biomonitoring) and confront it to RfD or AOEL (if existing). A major difficulty is that AOEL for pesticides are often empiric and are not based on scientific studies. In this context a first screening of allowed pesticides in France using carcinogenicity criteria has been done using US-EPA and OMS databases in order to selected possible carcinogenic pesticides. Population to study is selected by analyzing farming practices; this should able to select population who frequently uses carcinogenic pesticides. It appears that apples, potatoes and wine growers are often exposed to carcinogenic pesticides, especially fungicides (captan, mancozeb, maneb and folpet) and insecticide (pyrimicarb). Our work is focused on selected pesticides and cultures to determinate the risk for farmers health using biomonitoring (compared to available AOEL or RfD), and verifying if it is in accordance with the risk percept by farmers. The misperceptions of risk are leading to pesticides overexposure (e.g. poor usage of PPE with pesticides perceived as safe). This work should be helpful for risk mangers, ergonomists or people who work on a best usage of pesticides in agriculture.