Since the beginning of the International Space Station (ISS), water and air quality have been monitored to ensure crew health and verify the performance of the regenerative Environmental Control and Life Support (ECLS) systems. Over the last 25 years, the ISS has evolved greatly with significant changes to operations, crew complement sizes, visiting vehicles, payloads, and upgrades within the regenerative hardware, seen through Technology Demonstration integrations. In particular, better assessment and prevention of volatile organic releases from payloads and crew hygiene products, and implementation of advance sorbents both on the air and water strings have been successful in reducing contaminant loads. Data on air and water quality for the last five years on ISS will be presented (nominal and contingency air grab samples, in-flight monitoring for air and water quality, and water samples from all segments of the ISS water system), including some notable events. The available data demonstrate the performance of existing ECLS systems and overall status of how the approach to air and water quality have evolved through the new ISS architecture baseline operations.
Williamson et al. (2024) studied this question.