Landau Associates conducted air quality analyses and provided permitting services for multiple internet/software data centers in Washington (Wenatchee and Quincy).  Air quality analysis included identifying criteria pollutants and air toxics associated with emergency generators and cooling towers, estimating air emission rates, modeling air dispersion, analyzing best available control technologies, and evaluating impacts to ambient air to demonstrate compliance with state and federal regulations. In addition, we performed human health risk assessments to satisfy state requirements due to elevated levels of nitric oxide emissions associated with the operation of emergency power generators.