Can my HEPA air filter reduce levels of airborne lead?

Answer:

Airborne lead is an issue in Shanghai.  We've found that the level fluctuates with season and industrial activity.  Sources include: industrial emissions, lead battery production and reclamation of lead from batteries, some diesel and aviation fuel, and use in manufacturing.  Lead is a particulate (lead dust ranges in size from 0.3 to 10 microns), so most HEPA filters will help reduce.  However, filters, are only one part of a lead reduction strategy -- other critical steps include knowing when and how to ventilate, testing for lead in your environment because lead in soil is persistent for decades and can be easily tracked into the house, using HEPA vacuums.