It was essentially the wild west
Some models even market themselves specifically for pet owners, providing dual-function benefits in homes dealing with both secondhand smoke and animal allergens
Thus, although air cleaners likely have a positive overall effect in reducing the presence of respiratory pathogens like SARS-CoV-2, and may help some occupants avoid infection, they remain a complement to other critical health protective measures such as vaccination, staying home when sick, masking, ventilation, barriers, surface cleaning, and hand hygiene
They wont completely cleanse the air like in lab tests, but they do help reduce some toxins, add a bit of humidity, and make your space feel fresher and more inviting.