Purpose: The purpose of this study is to research how temperature; training intensity and duration affect cross country-skiers and biathlon´s asthma. With the aim to establish optimal training guidelines to optimize the asthmatic cross-country skiers and biathlete´s training results. Theoretical framework: The theoretical framework is based on the background and research, for the purpose to interpret and discuss the results. AQUA©: Allergy Questionnaire for Athletes ©, research and a training intensity pyramid have been used to shape the quantitative survey. Method: The quantitative survey was done by 68 participants, between age 17-68. Of the 68 participants; 21 have been diagnosed with asthma (30,88%), 15 people have at some point suspected that they have asthma (22,06%) and 32 people have never experienced or have any asthmatic symptoms (47,06%). Participants self-categorized as either: practicing cross-country skiers, practicing biathlete´s, competitive cross-country skiers, competitive biathlete´s, elite/national team cross-country skiers or elite/national team biathlete´s. The surveys data were analysed by using bivariate Pearson´s r and frequency distribution, for the purpose to compare between the significant results and the frequency distribution. Result and summary: The results shows that the asthmatic cross-country skiers and biathlete´s are mainly affected by temperature and training intensity. While training duration plays a small significant role. No guidelines could be established. But it´s possibly recommended to use a breathing mask with a heat and moisture exchanger to counteract the respiratory symptoms.