Here is a air purifier that filters the air everywhere you go. The Smart Gadgets USB Wearable Air Purifier comes with a negative ion generator and aroma diffuser. Its HEPA filter removes 99.5% of 0.3 micron particles. The battery lasts 13 hours.
The device filters dust, pollen, and other small particles to help you manage your allergy. Costs under $245 at this time.