Many outdoor contaminants are the source of causing indoor air quality problems.
While it is often difficult to eliminate the outdoor air pollution it is not unreasonable to develop strategies for managing or controlling unwanted outdoor contaminants. Insure outdoor air intakes are free of visible materials and standing water. At loading docks and near outdoor air intakes require vehicles to turn motors off. Limit use of gasoline, propane, and diesel powered landscape equipment near outdoor air intakes when the building is occupied. Reduce temporarily outdoor air vent intake rates during times you know you can not control outdoor air contaminants from coming in the building.