PureAura is a high-efficiency portable mini air purifier designed with humanitarian technology at its core. It aims to improve indoor air quality for users in Hong Kong's Subdivided Units (SDUs) or small spaces to protect their health. Standing out for its affordability, portability, high efficiency, compactness, ease of assembly, and low power consumption, the PureAura air purifier is specifically designed for use in subdivided or small spaces. Priced at less than $18, this air purifier can operate continuously for 40 hours using a small 10000mAh USB portable power bank. Scientifically proven, it can quickly reduce indoor PM 2.5 particulate levels by 80%. It can reduce levels to below 5 micrograms/cubic meter with sustained use, as recommended by the World Health Organization's global air quality guidelines.