Surface and upper air meteorology play a vital role in the formation and transport of O3. Consequently, meteorology has an impact on population exposure to O3. In order to support monitoring objectives associated with model inputs and performance evaluations, meteorological monitoring is required for each Photochemical Assessment Monitoring Station (PAMS). Surface meteorological measurements should begin within the first year of network operation. Upper air meteorological data (up to 3 km) for determining mixing heights should be collected corresponding to specific model input requirements. Quality assurance procedures are outlined for ground-based remote sensors used to acquire upper air meteolorological data. Acceptance testing, calibration procedures, performance audits, operation, maintenance, and quality control are briefly discussed.