Blood clot in a lung Collapse of a lung Prevention Avoid allergic substances or agents that induce asthma, if you have it. Do not walk, run or jog on roads with heavy automobile traffic. If you have a gas furnace, install a carbon monoxide detector. Never leave your car running in a closed garage. If you smoke, quit.
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Avoid secondhand smoke. This applies to anyone with breathing difficulties. Install an electronic air filtering system or use an air purifier in your home, especially in the bedroom. Tests show that air filters help clear the air of allergy-causing agents. Molds and mildew grow on leaves after they've been on the ground for a few days.