Are air purifiers enough?

In most urban cities, the past decade has been a time of environment monitoring and maintenance, given the increase in pollution levels. One of the biggest concerns this year has definitely been air pollution and its effect on Indoor Air Quality (IAQ). Since then, air purifiers have been a constantly evolving constant in almost every home, with new research and additions taking place every year. But, with the rate at which air quality is deteriorating, will air purifiers be enough?

Most air purifiers work with multiple layers of filters, that remove pollutant particles from the air based on their size. The most commonly monitored particulate matter sizes are 2.5 microns (PM2.5) which include volatile organic compounds (VOCs), metals and combustion particles, etc., and 10 microns (PM10) which includes dust, pollen, mold, etc.