Why Luxury Hotels Are Lying To You (Toxic Air) — James Nestor
Tim FerrissPublished on October 8, 2025
Summary authored by editor@wellifi.com
TLDR Summary
Indoor CO2 levels can severely impact cognitive function and overall health, particularly in environments like schools and hotels. Monitoring CO2 levels and advocating for better air quality can lead to improved well-being.
Key Points
- Indoor CO2 levels can significantly impact cognitive function and health.
- CO2 levels above 1,500 ppm can reduce cognitive test scores by up to 50%.
- Airplanes often have CO2 levels exceeding 2,500 ppm, contributing to fatigue.
- Many hotels have sealed windows, leading to poor air quality.
- Using a reliable CO2 monitor, like the Aeronet 4, can help individuals track air quality.
The Importance of Indoor Air Quality: Understanding CO2 Levels
In recent years, awareness about indoor air quality has gained traction, especially concerning carbon dioxide (CO2) levels. While many are familiar with the rising CO2 levels in the atmosphere, the impact of indoor CO2 levels on our health and cognitive function is often overlooked. In this article, we delve into the significance of monitoring CO2 levels indoors, particularly in settings like schools and hotels, where we spend a considerable amount of time.
Understanding CO2 Levels
Currently, outdoor CO2 levels are approximately 424 parts per million (ppm). However, many of us spend about 90% of our time indoors, where CO2 concentrations can escalate significantly. Research spanning several decades reveals alarming trends: when indoor CO2 levels reach around 1,500 ppm, cognitive function can suffer, with test scores dropping by as much as 50%. As CO2 levels increase to 2,500 ppm and beyond, symptoms such as headaches and chronic migraines become prevalent, leading to even more severe cognitive impairments at higher concentrations.
Air Quality in Airplanes and Hotels
Travelers often experience fatigue and drowsiness after flights, and this can be attributed to CO2 levels in airplanes, which often exceed 2,500 ppm. Despite recommendations from engineering associations to keep indoor CO2 levels below 1,000 ppm, every flight monitored has reported levels above this mark. Hotels, too, have become a concern: many have sealed windows to save on heating and cooling costs, leading to poor air quality. In fact, some hotels that boast of being environmentally friendly have recorded CO2 levels reaching as high as 2,800 ppm.
Strategies for Improving Indoor Air Quality
To combat the negative effects of high CO2 levels, individuals can take proactive measures:
- Carry a CO2 monitor to keep track of indoor air quality.
- Call ahead to hotels and inquire if they have windows that can be opened.
- Choose hotels and venues known for good air quality.
Recommended CO2 Monitors
After testing various CO2 monitors, the Aeronet 4 has emerged as the most reliable option, offering accuracy and long battery life. Investing in a quality monitor can empower individuals to make informed decisions about their environment.
The Need for Awareness and Action
As we continue to learn more about indoor air quality, it is vital for individuals to stay informed and take action. By monitoring CO2 levels and advocating for better air quality standards in public and private spaces, we can enhance our cognitive function and overall well-being.
Conclusion
In conclusion, the implications of indoor CO2 levels are significant and warrant attention. Understanding the effects of air quality on our health can lead to improved environments, particularly in places where we spend the majority of our time, such as offices, schools, and hotels.