Exchange of momentum and gases between the ocean and the atmosphere is strongly influenced by physical processes in the near-surface waters. Surface waves are particularly important for both momentum and gas fluxes. Waves enhance momentum flux by acting as roughness elements and channeling momentum directly from wind into surface waves. They also enable faster transfer of gases across the diffusive sublayer at the water surface by causing more frequent renewal of the skin layer. Even though the relevance of waves is qualitatively well established, the paucity of data sets with concurrent wave and flux measurements has hampered parametric studies of wave effect on air-sea fluxes. During the CoOP air-sea gas exchange experiments off California and off New England, we obtained one of the most comprehensive data sets for this purpose in both near-shore and off-shore waters. During these experiments spectral measurements of gravity and gravity-capillary waves were made from a towed or self-propelled catamaran, using an array of wave-wires and a scanning laser slope gauge. An array of Sontek current meters was used for near-surface current and turbulence measurements, and wind measurements were made with sonic anemometers. Three-axis linear and angular accelerometers were used for platform motion correction. Surface enrichment of organic compounds was measured with an on-board surface microlayer skimmer and fluorometer. A comprehensive summary of wave observations under a wide range of conditions will be presented, and relationship with the observed air-sea fluxes will be discussed.