Air filter recharged by sunlight and indoor LEDs keeps 99% efficiency

Scientists developed an air purifier that recharges from sunlight and indoor LED lights, offering a low-cost, low-maintenance alternative to standard filtration. The filter retained 99% of its maximum filtration efficiency after a month of use and 95% over the next two months. It could eventually be used in reusable versions of N95 masks.

• Filter recharges from sunlight and indoor LED lighting
• Retained 99% of maximum filtration efficiency after one month
• Held 95% efficiency over the following two months
• Could be used in reusable versions of N95 masks