Protect every breath.

Our Mission

9 out of 10 people in the world breath dangerous air that exceeds acceptable WHO limits.

According to the WHO, the combined effects of ambient (outdoor) and household air pollution cause about seven million premature deaths every year, largely as a result of increased mortality from stroke, heart disease, chronic obstructive pulmonary disease, lung cancer and acute respiratory infections.

4C Air is devoted to changing this. Our goal is to improve the lives of those affected by poor air quality by providing safer, cleaner air through innovative nanotechnology products and solutions.

Our Story

4C Air was founded in 2015 by Professor Yi Cui and Professor Steven Chu of Stanford University.  Through hard work and innovation, 4C Air was able to develop a new nanomaterial ideal for use in filtering applications.

Today, the company continues to work on developing nanotechnology products and solutions to provide the world with better protection against harmful airborne particles and poor environmental conditions. 

World-class scientists and researchers dedicated to innovation.

4C Air Favicon

Yi Cui, Co-Founder

Professor of Materials Science and Engineering, Stanford University

Professor Yi Cui is a world-leading expert in nanotechnology, materials science, energy and environmental technology. He is a highly proliferate scientist/engineer/inventor with more than 360 research publications and more than 50 patent applications. At the age of 28, he was awarded Innovators under 35 by MIT Technology Review, and he has consistently been awarded “The World’s Most Influential Scientific Minds” by Thomson Reuters. He is a Co-Director of the Bay Area Photovoltaic Consortium and a Co-Director of the Battery 500 Consortium funded by the US Department of Energy. He is a Fellow of Materials Research Society and the Fellow of Royal Society of Chemistry.

Professor Steven Chu

Steven Chu, Co-Founder

Professor Steven Chu known for his research regarding the cooling and trapping of atoms with laser light, for which he won the Nobel Prize in Physics in 1997. Afterwards, he served as the 12th United States Secretary of Energy from 2009 to 2013, where he was a vocal advocate for renewable energy and environmental research. Returning to Stanford, his group has focused on biophysics, energy, and environmental technology. He is a member of the U.S. National Academy of Sciences, the American Academy of Arts and Sciences, the American Philosophical Society, the Academia Sinica, and is a foreign member of the Chinese Academy of Sciences and the Korean Academy of Science and Engineering.

Meng Sui CEO 4C Air

Meng Sui

CEO, 4C Air

Zhi-Xun Shen

Advisor, Professor of Physics, Stanford University

Peidong Yang

Advisor, Professor of Chemistry, UC Berkley