Houseplant Humidity: Measure the Air Before Misting
Brown leaf edges do not prove that the air is too dry. Check the species, root-zone moisture, light and pests before treating humidity as the cause. Air humidity and potting-mix moisture are different measurements: extra watering cannot reliably correct dry air.
Measure where the plant grows
Place a hygrometer near the leaves, away from direct spray, and compare readings at different times with room temperature. A reading beside a running humidifier does not describe the whole room. Choose a target appropriate to the species and the building; avoid a universal percentage for every plant.
Choose a method you can maintain
Iowa State Extension explains that occasional misting does not sustain higher relative humidity. Grouping plants can change the local environment, but its effect varies with airflow. If using a pebble tray, keep the pot above the water; it is not a reservoir for soaking roots. A humidifier offers more direct control, but follow its cleaning instructions and check the result with a meter. (Iowa State Extension)
Compare before adding more moisture
Record location, temperature, humidity, leaf condition and the method used. Keep the measuring position consistent. If condensation develops on windows or nearby surfaces stay wet, reduce added moisture and review ventilation. Do not keep increasing output to repair old brown tissue: judge subsequent growth. A humid room still needs species-appropriate watering.