In recent years there has been an explosion in the availability of small, low cost, hand held (or drone mounted) air quality monitoring devices or air sensors. Although the most likely near term applications may be community groups seeking information on potential industrial impacts, even individual consumers may have use for such devices to monitor the quality of indoor air. The biggest hurdle to the effectiveness, and eventual integration into the realm of regulatory compliance, of these devices is the lack accepted standards for evaluating the quality of the data they produce. What role will EPA play in that?