Packaging material needs to be removed from the filters from your Philips Air Purifier. Please remove all packaging materials as shown in the below picture.

All filters need to be placed in the right order in your air purifier.

Most Philips Air Purifiers contain filters as shown in the image below (some do not contain filter B).

Please check in the user manual what filters your specific air purifier model contains.

The air quality sensor in your Philips air purifier (indicated as D in the image below) should be dry and clean. Please check, and clean it with a cotton bud if necessary.

If the windows are open and polluted air continues coming in from outside, your purifier might not be able to improve the air quality.

Make sure that all windows are closed.

The room in which you run the air purifier is larger than the maximum size at which this air cleaner can operate effectively.

Make sure the size of the room does not exceed the maximum indicated for your air purifier model.

When adding new furniture to a room, the air quality might become affected by gases it might emit. These gases should disappear gradually in the next weeks.