“Your Own Green Area, or YOGA for short, is a start-up with a factory an hour from New Delhi, providing a service called the Clean Air Bubble to an elite client base of around 5,000 homes nationwide. About 90 percent of its customers are in the capital.

The YOGA machine works differently from free-standing indoor purifiers, which gradually clean and recycle the air. The device sits outside the house, sucking in polluted air and blowing it through thick, highly-efficient filters. It constantly pushes the filtered air inward through custom-fit openings in a home’s exterior. This creates a pressurized bubble that prevents dirty air from leaking into the interior.

The company said this approach was especially effective for PM2.5, the microscopic particles responsible for the deadliest form of air pollution. Besides premature death, high concentrations of PM2.5 have been shown to cause dementia and to hobble the national economy by shortening productive life spans.

There is no peer-reviewed academic study on the YOGA system’s efficacy. However, customers who have installed the product have had PM2.5 levels in their homes dropping to nearly undetectable levels based on air-quality readings from third-party monitoring devices.”

From New York Times.