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    Engineering controls

    This type of control involves making physical modifications to control the hazard or reduce exposure. Some questions to consider:

    • Can screens and pest control be used to prevent birds and bats from accessing a building or gathering in high-traffic areas?
    • Can you use deterrents (e.g., balloons, flags, or lights) to prevent birds from roosting on window sills and ledges?
    • Are vacuum cleaners equipped with HEPA filters available to clean up dust contaminated with droppings?
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    Administrative controls

    This type of control involves changing work practices and policies. Some questions to consider:

    • Do you have safe work procedures for cleaning up material that is contaminated with droppings?
    • Is there an effective personal hygiene program for workers?
    • Are workers changing into "street clothes" before leaving work for the day?
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    Personal protective equipment (PPE)

    This is the least effective type of control. When used, there must always be at least one other control in place as well. Some questions to consider:

    • Are workers using respirators?
    • Are workers wearing protective clothing?

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