Building air quality issues are often generated by air pollutant emissions from affected buildings themselves, or from nearby structures. The emissions from laboratory hood vents, or boilers or generators associated with large complexes can be inadvertently directed, by wind conditions, back into the building, through fresh air intake ports. The Air Compliance Group, LLC can provide computer modeling services, or field measurements services to ascertain the level of this threat. If a concern is identified, The Air Compliance Group, LLC can recommend, design and supervise activities to alleviate the problem.