Is buying an air purifier really useful for improving indoor air quality?

Do you think air purifiers with HEPA filters are worth buying especially for high pollutant areas? Does it improve air quality indoors?

Which air purifier brand do you trust the most for Delhi's air quality and why?

Delhi pollution makes air purifiers almost essential during certain months. Which brand has worked best for your home, and why do you trust it?

Which air purifier under Rs. 20,000 would you recommend for a bedroom?

I want something mainly for dust and indoor air quality. Which model has actually worked well for you?

Should I prioritize an air purifier that has a HEPA filter?

I am planning to buy an air purifier and keep seeing HEPA filters mentioned everywhere. Should I make a HEPA filter my top priority, or are there other features that are just as important for better indoor air quality?

Is it worth buying a smart air purifier with app controls?

I am thinking about buying a smart air purifier with app controls. Are features like remote control, air quality monitoring, and scheduling actually useful, or are they just extras? Is it worth spending more for a smart model?