2 Purpose: Police in Europe are facing increased demands and diminished resources, and this is 3 particularly prominent among Emergency Response Officers (EROs) working in poorer 4 countries such as Portugal. Considering that daily stress and limited coping skills can result in 5 detrimental consequences for officers´ health and society welfare, this study investigated stress 6 and coping among Portuguese EROs. 7 Design: EROs completed daily diaries over 11 working days. Each diary entry

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... d an open-8 ended stressor, coping section and a Likert-type scale to evaluate coping effectiveness. Data was 9 analyzed using inductive and deductive content analysis procedures. The frequency of stressors, 10 coping and coping effectiveness were calculated. 11 Findings: EROs reported facing more operational stressors, particularly public disorder 12 situations. However, gun situations were perceived as the most intense stressor. Emotion-focused 13 coping (i.e., peer support) was more used than problem-focused. Despite variation in coping 14 effectiveness in accordance to stressor experienced, longitudinal analysis suggests that PF coping 15 is more effective. 16 Research limitations/implications: Longitudinal methodologies should contemplate stress 17 appraisal and coping effectiveness in order to fully understand stress and coping. Future studies 18 should employ this methodology at a larger scale and over longer periods.