The best way to measure the effectiveness of your air purifier when a window is open is to purchase an air quality monitor. Use the air quality monitor to measure your indoor PM2.5 levels when the window is open and closed after running the purifier for a fixed amount of time (e..g 1 hour). If the PM2.5 levels after 1 hour of running the purifier are higher when the window is open, then you may want to consider using a more powerful air purifier, or reducing the amount you open your windows.
Learn more: Can air purifiers still work effectively when windows are open »
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