Top Allergy and Asthma Triggers -- and How to Avoid Them

by Stephanie Welch Alexander

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Pests
Cockroaches, mice and rats are more than just unsightly nuisances -- droppings and urine left behind are major triggers of asthma symptoms -- particularly in densely populated urban neighborhoods.

Cockroaches, mice and rats are all attracted to offices and homes where food and water are easily accessible.