Testing The Bioweapon Defense Mode
Inspired by the air filtration systems used in hospitals, clean rooms and the space industry, they developed a HEPA filtration system capable of stripping the outside air…
Air pollution has a significant and pervasive impact on public health. According to the World Health Organization (WHO), it is now considered "the world's largest single environmental health risk," with more than three million people dying every year as a result. This is more than twice the number of people that die in vehicle accidents each year.
Health and safety are important to Tesla Motors. According to WHO, average annual PM2.5 (particulate matter 2.5) levels (the most dangerous form of pollution) reach 56 µg/m3 in Beijing, 25 µg/m3 in Mexico City, 21 µg/m3 in Hong Kong, 20 µg/m3 in Los Angeles, 20 µg/m3 in Berlin, 17 µg/m3 in Paris, and 16 µg/m3 in London. Based on the findings of a 2013 study conducted at Harvard, these levels of pollution would result in population-averaged life expectancy reductions of 23 months in Beijing, 10 months in Mexico City, 9 months in Hong Kong, 8 months in Berlin and Los Angeles, and 7 months in Paris and London.
A Model X was placed in a large bubble contaminated with extreme levels of pollution…
Just as they've designed Model S and Model X to avoid collisions or protect their occupants when one happens, they felt compelled to protect them against the statistically more relevant hazard of air pollution.
Inspired by the air filtration systems used in hospitals, clean rooms and the space industry, they developed a HEPA filtration system capable of stripping the outside air of pollen, bacteria and pollution before they enter the cabin and systematically scrubbing the air inside the cabin to eliminate any trace of these particles. The end result is a filtration system hundreds of times more efficient than standard automotive filters, capable of providing the driver and his/her passengers with the best possible cabin air quality – no matter what is happening in the environment around them.
The air filtration system was put to the test in real-world environments from California freeways during rush hour, to smelly marshes, landfills and cow pastures in the central valley of California, to major cities in China. They wanted to ensure that it captured fine particulate matter and gaseous pollutants, as well as bacteria, viruses, pollen and mold spores.
The subsequent evolution in pollution levels inside the vehicle and inside the bubble...
They then decided to take things a step further and test the complete system as they would on the road, but in an environment where they could precisely control and carefully monitor atmospheric conditions. A Model X was placed in a large bubble contaminated with extreme levels of pollution (1,000 µg/m3 of PM2.5 vs. the EPA's ‘good’ air quality index limit of 12 µg/m3). They then closed the falcon doors and activated Bioweapon Defense Mode.
The plot (Graph 1) shows the subsequent evolution in pollution levels inside the vehicle and inside the bubble. In less than two minutes, the HEPA filtration system had scrubbed the air in Model X, bringing pollution levels from an extremely dangerous 1,000 µg/m3 to levels so low as to be undetectable (below the noise floor) by their instruments, allowing them to remove their gas masks and breathe fresh air while sitting inside a bubble of pollution.
Not only did the vehicle system completely scrub the cabin air, but in the ensuing minutes, it began to vacuum the air outside the car as well, reducing PM2.5 levels by 40%. In other words, Bioweapon Defense Mode is not a marketing statement, it is real. You can literally survive a military grade bio attack by sitting in your car.
Moreover, it will also clean the air outside your car, making things better for those around you. And while this test happened to be done with a Model X, the same would be true of the new Model S now in production.
Tesla will continue to improve the micro-geometry and chemical passivation defenses in the primary and secondary filters, which are easily replaceable, so this will get better the longer you own your car. Suggestions for improvement are welcome by Tesla.
(Adopted from Tesla Team’s communication)