How People Purified Air in the Past?

Humanity’s Eternal Battle for Clean Air

The ancient Chinese who "stole light through a wall" might never have imagined that millennia later, humans would fight not just for light but for every breath. From the "water-filtered smoke" of the Han Dynasty’s Changxin Palace Lamp to the fragrant purification of Ming-Qing incense tubes, and now to intelligent air purifiers, humanity’s war against pollution has never ceased. Today, as we stand before Sunled’s air purifier, watching its blue indicator glow softly, this millennia-long battle is entering a new chapter of technological revolution.  

I. Ancient Wisdom: The Romance and Practicality of Air Purification

In the 2nd century BCE, Han Dynasty nobles safeguarded their health with the Changxin Palace Lamp—its hollow sleeve channeled oil lamp smoke into a water basin, reducing indoor pollution through "hydraulic filtration." By the Ming-Qing era, gilded incense tubes filled with flowers or spices, as described in Dream of the Red Chamber, blended air purification with poetic elegance.  

These ancient designs reveal a timeless truth: The need for clean air is woven into the fabric of human civilization.  

II. The Industrial Revolution: From Passive Defense to Active Solutions  

The 19th-century London smog spurred the invention of mechanical ventilation systems, while World War II saw the birth of HEPA filters—originally designed for biological warfare defense—which became the "heart" of modern air purifiers. These breakthroughs shifted air purification from mere harm reduction to proactive elimination.  

- 1942: HEPA filter efficiency surpasses 99.97%  

- 1956: Activated carbon adsorption technology first applied in industrial waste gas treatment  

III. The 21st-Century Revolution: Intelligence and Scenario-Specific Innovation

As smog and formaldehyde became public enemies, air purifiers underwent explosive evolution:  

- Technological Leaps: UV sterilization, negative ion generation  

- Smart Revolution: AI monitoring, app-controlled systems  

- Scenario Customization: Baby-safe modes, pet-specific solutions, ultra-quiet night operation  

In 2024, China’s air purifier retail sales surged by 32.6%, with "pet-friendly models" growing 67% year-on-year, reflecting booming demand for specialized solutions.  

IV. Sunled Air Purifier: Honoring Ancient Wisdom with Cutting-Edge Innovation   

When ancient artisans poured water into lamps to filter smoke, they could scarcely imagine their logic would be reimagined two millennia later:  

1. 360°Purification: A Barrier for Modern Breathing- Circular Air Intake Technology: Inspired by the Changxin Lamp’s omnidirectional design, five intake surfaces capture pollutants seamlessly.  

- H13 Medical-Grade HEPA Filter: Traps 99.9% of particles as small as 0.3 microns—even COVID-19-carrying droplets (≈0.1 microns) stand no chance.  

2. Visible Assurance: When Air Quality "Speaks"  

- Four-Color Air Quality Indicator: Blue (excellent), Green (good), Yellow (moderate), Red (polluted)—instant clarity at a glance.  

- Dual Digital Display: Real-time PM2.5 and humidity monitoring, ending guesswork in purification.  

3. Silent Guardian: Pure Air, Unnoticed  

- UV-C Sterilization: 254nm wavelength eliminates 99% of bacteria and viruses.  

- Night Mode: Whisper-quiet 25dB operation with 30% energy savings—clean air without disruption.   

V. The Evolution of Breath: A Future Defined by Freedom

From pepper-infused Han Dynasty walls (for moisture control) to Sunled’s smart humidity sync; from crude incense adsorption to HEPA’s precision—humanity’s air purification journey is, at its core, a fight for dignity.  

In 2025, as China’s updated Air Purifier Energy Efficiency Standards take effect, this evolution accelerates. Sunled’s answer? Technology that returns breathing to its purest essence.  

A 2,000-Year-Old Question, Answered in Blue  

When Han craftsmen polished the Changxin Lamp’s bronze tubes, they defined "purification" with a flickering flame. Today, Sunled redefines "breathing freedom" with a ring of blue light—a dialogue between past and future, and a promise:  

"Every breath deserves to be cherished."