Bronchitis in definition contains increased sputum production and cough. They gain importance through smoking and air-pollution. Both influences are good recordable. The last one is demonstrated by a regional air-monitor-net. Connections between air-pollution and airway diseases are seen in course-monitoring after pollution reducing actions. Essential complication of bronchitis as an airway disease in obstruction, airflow limitation. In small airways it runs at least synchronously. This obstruction is more sure and objective measureable than subjective complainted cough. This data, especially those of the flow-volume-loop, should have more weight. They correlate statistically significant in own studies in town-to-country differences to pollution, not to the only symptom of cough. Peak-Exspiratory-Flow and spirography show in comparison only a trend. The flow-rates might demonstrate more surely and objectively the environment-infrastructure in function data as possible cause for bronchitic airway diseases.