CNET’s expert staff reviews and rates dozens of new products and services each month, building on more than a quarter century of expertise. SwitchBot's air quality monitor is the most affordable way we've found to keep an eye on your home's air quality. As temperatures drop and windows close, air quality tends to worsen. , more fires, more candles and more gas heating and the winter months can prove bad for your lungs, especially if you have preexisting conditions....
