Never let anyone smoke inside your home. The Surgeon General states that there is no level of secondhand smoke that is safe.

 2. Buy & Install a Carbon Monoxide Detector, Test and Clean Your Air

Carbon monoxide poisoning claims the lives of over 400 people each year and thousands of others become ill or seek medical attention after exposure to the odorless gas.

Dry cleaning solvents can be toxic to breathe. Let dry-cleaned items air outdoors before bringing them inside to prevent chemicals from entering your home.

Dust allergies are actually allergies to dust mites — microscopic pests that need moisture to survive. Dust mites feed on human skin and live in bedding, pillows, mattresses, stuffed toys, upholstery, and carpets.

To fight dust mites in your home try these steps:

1. Keep humidity levels below 50% with a dehumidifier.

2. Vacuum and steam clean upholstered furniture.

3. Remove carpets.

4. Use dust-mite-resistant covers and wash bedding in very hot water.

Proper ventilation is one of the best ways to protect and improve the air in your home.

High levels of moisture increase dampness and the growth of mold, which can lead to wheezing, coughing, and asthma attacks in people with allergies. Normal daily household activities — including cooking, washing, and even breathing — produce water vapor, so having adequate ventilation is essential.

Try these dehumidifying tricks to keep the humidity in your home below 50%:

1. Install and run exhaust fans in bathrooms.

2. Make sure that vents exhaust air outdoors and not into other parts of your home.

3. Remove any mold damage or growth and fix all leaks.

Lead-based paints can still be found in homes built before 1978. Any peeling, chipping or chalking of lead-based paint can increase the risk of unhealthy lead exposure.

Young children risk delays in mental development, lower IQ and behavioral problems from inhaling lead paint dust. Some of those damages can be permanent.

Remodeling that requires sanding, scraping or removing walls will release paint dust into your living space. However, you can reduce the risk if you take the proper steps.

1. Keep areas where children play as dust-free as possible.

2. Leave lead-based paint undisturbed if it is in good condition. Do not sand or burn off paint that may contain lead.

3. Do not remove lead paint yourself.

5. If your work or hobby involves lead, change clothes and use doormats before entering your home.

Burning gas or other fuels indoors can produce dangerous levels of indoor air pollution and deadly carbon monoxide. Fumes from cars or lawnmowers left running in enclosed spaces, like garages, can endanger your health. To that point, you should also only use gas stoves and heaters that vent directly to the outside. Never use charcoal grills indoors.

Rain and high humidity can bring moisture indoors, which can lead to mold and mildew. Dampness alone — even without mold — is associated with higher risk of wheezing, coughing and asthma symptoms.

Check your roof, foundation, and basement once a year to catch leaks or moisture problems and route water away from your home’s foundation.

Help keep asthma triggers away from your house by fixing leaks and drips as soon as they start. Standing water and high humidity encourage the growth of dust mites, mold and mildew — some of the most common triggers that can worsen asthma. Use a dehumidifier or air conditioner when needed, and clean both regularly.

Pet allergies can come from an animal’s saliva, urine, feces and dead skin cells, so no pet is “hypoallergenic.”

If you’re sensitive to pet allergens, keep furry friends away from sleeping rooms. Clean floors and upholstered furniture frequently (two or more times a week) to reduce exposure. Washing you pets or using indoor air cleaning devices helps will not help much.

Paints release trace amounts of gases for months after application — even though they appear to be fully dried and the smell is gone. These gases are called VOCs, or volatile organic compounds, and can include highly toxic chemicals such as formaldehyde and acetaldehyde.

Use “low-VOC” paints, varnishes, waxes and other chemicals, and open windows and use exhaust fans to remove gases when you paint. Do not store open paint containers indoors.

Asbestos is a mineral fiber that can still be found in many older homes. Inhaling tiny asbestos fibers can increase the risk of lung cancer and other lung diseases. Pipe coverings, flooring, shingles and roofs are likely places to find it.

Check asbestos-containing materials regularly for damage. Don’t try to remove asbestos that is already in place; it is best left undisturbed. If the material is damaged, or you plan to remodel, always get professional help.

Fireplaces and wood or gas stoves can produce carbon monoxide, nitrogen oxides, and fine particle pollution.

If you use a wood or gas stove or fireplace, make certain it is fully vented to the outside.

Formaldehyde is a gas found in many home products, like disinfectants, adhesive, insecticides, and particle board. It is a carcinogen and can cause health problems that include coughing, eye, nose, and throat irritation, skin rashes and asthma-like symptoms. People with asthma may be more sensitive to formaldehyde.

Keep formaldehyde away from your home by choosing wood panel products that are not made with formaldehyde glues, lumber or materials. Cigarette smoke is also a major source of indoor formaldehyde — another reason to ban smoking from your home.

Pesticides can bring harmful chemicals into your home and may cause added health dangers to children and pets. Still, some pests can trigger allergic reactions and worsen asthma.

Practice “integrated pest management” to keep your home free of pests and harmful chemicals alike. This means blocking holes and keeping food in tightly sealed containers. Cover your trash cans and keep your floors and counter free of crumbs. Use bait traps to catch pests. Only use chemicals as a last resort, and get professional help.

Hair and nail products, cleaning products, art and hobby supplies and other common products can increase the levels of VOCs.

Look for products that are marked “low VOCs” and be sure to open windows and use exhaust fans when using these products.

Cooking can be a big source of indoor air pollution, especially if you have a gas stove. Scientists who measured indoor air quality found that cooking a single meal on a gas stove can produce levels of nitrogen dioxide that the EPA considers unsafe to breathe.

Ventilate your kitchen stove directly outside or open a kitchen window when you cook.

Bathroom fans can help reduce moisture and prevent the growth of mold. Consider installing a fan with a separate timer that can continue to remove moisture after you turn out the light.

A little common sense goes a long way. If a bathroom smells like mold or you can see water spots, you need to reduce the moisture.

Air cleaning devices can help reduce some of the tiniest airborne particles, and as part of a comprehensive strategy, may help reduce indoor air pollution.

However, they have limits. For example, they aren’t effective against gases or humidity. Larger, heavier particles — including many allergens — fall too quickly out of the air to be effectively removed.

Carpet traps unhealthy particles — including chemicals, dust mites, pet dander, dirt and fungi — and vacuuming can make them airborne.

If you do have carpets, use a HEPA (high efficiency particle air) vacuum cleaner to ensure better air quality.