Weather reports warn us when air pollution and smog is dangerously high. When we travel on an airplane, we’re all-too-conscious of noxious bacteria floating about without the option of opening a window. Yet many of us don’t think about the air quality in our own homes.

Unhealthy outdoor air can seep into our living space, where pets and cleaning supplies produce allergens and fumes. Quality air purifiers go a long way toward eliminating pollutants that we may not be able to see or smell. Here are some great options to help you breathe with confidence.

With a cleaning capacity of up to 1,256 square feet, this unit can cycle through the air even in larger spaces like art galleries, offices, or loft apartments. A true HEPA filter (which the U.S. Department of Energy defines as a filter that removes at least 99.97 percent of airborne particles 0.3 micrometers in diameter) and an activated carbon filter work together to collect particles, reduce over 99 percent of your air’s volatile organic compounds (VOCs), and lessen fumes from ammonia and the carcinogen acetaldehyde. The pre-filter (which traps large particles) can be washed and does not need to be replaced. When it’s in smart mode, the purifier will adjust its fan speed based on conditions. An LED ring shows you how your air rates at all times—and may offer unrequested feedback on your culinary skills.

Enjoy the same true HEPA filter and activated carbon filter combination of the Airmega 300 in medium-sized spaces up to 325 square feet—and gain the ability to communicate with it using Alexa or your smartphone. This attractive model resembles a speaker and features an eco mode that pauses the fan when no pollution has been sensed for 30 minutes. With the IoCare app or through your home assistant, schedule it to turn on when you’re still at work but know your roommate is cooking an epic meal, and monitor air quality when you’re traveling so you can ask pet sitters or neighbors to step in when smog or smoke requires windows to be shut.

If you like to be able to control all the devices in your home with an assistant like Alexa, this air purifier gives you plenty of options. This is an excellent choice for a living room or kitchen, with up to 360 square feet of coverage using a true HEPA filter to cycle through your air 4.5 times an hour. Set schedules using the VeSync app or activate your device using your home assistant. You can also check filter life with the app and get replacement recommendations based on your actual usage, not an arbitrary length of time.

This cute and quiet device filters your air five times an hour and is perfect for your bedroom, dorm room, or any space up to 175 square feet. The fabric pre-filter traps large particles like dust mites and pet hair, a particle filter removes allergens like pollen, mold spores, and pet dander, and a carbon filter reduces smoke and odors. This unit comes with dark blue and grey pre-filters for a stylish appearance, and you can purchase additional colors if you just have to have a pink air purifier to match your bedspread. You’ll want to replace the filters about every six months. It’s also Energy Star certified, so it won’t drive up your electric bill.

If you live in a studio apartment or your open floor plan includes a spacious kitchen and living area, this air purifier is an excellent choice. Using a true HEPA filter, it employs a laser sensor to monitor air quality and clean up to 710 square feet. While it isn’t compatible with smart devices, you can still program the purifier to run anywhere from 1 to 12 hours at a time. Change fan speeds manually, or let the purifier sense the most efficient way to clean depending on current levels of pet dander, smoke, or allergens. If you decide to put it in your bedroom, you can turn off the LED display to make sure the lights don’t interfere with your slumber.

Do you often find yourself in hotel rooms with a lack of fresh air and overtones of harsh chemical cleaners? This innovative and compact new device—named one of 2016’s top 25 inventions by Time—can make small enclosed spaces like hotel rooms, cars, and cubicles more pleasant. The Wynd uses a medical-grade filter containing silver, which works to clean the air and kill airborne bacteria within a 3-foot radius. It fits easily in your luggage, weighs less than a pound, and looks kind of like a high-tech thermos. Track your environmental conditions with the Wynd mobile app. It cycles through 9 liters of filtered air per second.