I live in Maryland. I bought a HEPA air purifier with automatic, smart sensor-based operation to help with things like particulates during the central Canada wildfires.
The air purifier's integrated air quality sensors constantly monitor fine dust particles (PM2.5), CO2, temperature and humidity. Its air quality sensors monitor room air quality throughout the day, adjusting fan speed and purification to the necessary level, saving energy when air cleaning is not needed. The air quality indicator projects a soft glow behind the air purifier to indicate current air quality, based on measurements from the internal air quality sensors.
My purifier's air quality sensors circumstantiate that air quality is better at night; the purifier automatically slows down at night.