Slashing emissions of carbon dioxide by itself isn’t enough to prevent catastrophic global warming, a new study shows. But if we simultaneously also reduce emissions of methane and other often overlooked climate pollutants, we could cut the rate of global warming in half by 2050 and give the world a fighting chance. The study, appearing … Read more
Updated October 2026: This article was originally published in June 2022 and has been expanded with additional guidance on CADR, room size, AQI conditions, fan speed, energy use, placement and air purifier safety. Most people know that air purifier filters eventually need maintenance or replacement, but there is no single interval that fits every purifier … Read more
Updated October 2026: This article has been expanded with current technical guidance, clearer limitations, additional examples and new practical visuals while retaining its original URL and core reader flow. Air purifiers are designed to improve indoor air quality, but people reasonably ask whether the device itself can cause problems. A conventional fan-and-filter purifier that is … Read more