Environmental problems and questions related to air pollution are very frequent. We compile ambient air pollution permits and assess the ambient air quality in settlements. Hendrikson & Ko uses internationally approved ambient air pollution modelling software AEROPOL, which is developed in collaboration with the scientist from the University of Tartu. We provide expert assessments, carry out surveys and in collaboration with partners organize more complex measurements. We can help to calculate emission quantities and to develop methods for assessing pollution from emissions if there are no methods approved by Minister of the Environment. We have also compiled actions plans to reduce emissions, inc. action plans to reduce organic compound emissions.