AirGradient Forum

Beyond the Numbers: The Controversy in PM2.5 and Health

AirGradient Blog
#1

This article is part of a series, where we explore the hidden complexities of PM₂.₅ — tiny airborne particles that impact air quality and health. We will uncover the ambiguities behind its measurement, the challenges in assessing health risks, and the surprising insights that emerge. Each article will tackle a different aspect of PM2.5, shedding light on its hidden dilemmas and unanswered questions. Today’s article discusses the uncertainties behind the health effects of PM₂.₅ from a critical perspective.

This is a companion discussion topic for the original entry at https://www.airgradient.com/blog/the-controversy-in-pm25-and-health
#2

Thanks for the article. Good to see that AirGradient is interested in the truth, not alarmism that could help sell its product. Though I wouldn’t expect anything different from Achim.

It’s certainly relevant since a) my Indoor Monitor has alerted me to PM2.5 levels that seemed very concerning if short lived (a couple times from apartment building or unit renovations) and also given me comfort when I’ve smelled things, but don’t see anything concerning in the data and know the source.

I was particularly interested to read that solubility may be some indication of the toxicity of a particle. Based in part on this IMO well argued essay, The case against ultrasonic humidifiers, I have avoided ultrasonic humidifiers and recommended same to others because they emit measurable PM2.5

Since the PM2.5 particles in tap water are soluble (am I right? otherwise they woudln’t be emitted by the ultrasonic humidifier), perhaps the health risk is lower than combustion PM2.5. Seems likely. And at the same time, as that article suggests, why take the chance, when evaporative humidifiers are available.

#3
#4

It didn’t cross my mind that alarmism might sell monitors but yes this is most likely true.

But you are right, this is definitely not our approach.

Having said that and seeing how crowded the hospitals here in Thailand are during the so called burning season, especially on particular bad days, I think there is no question that high PM can have severe heath impacts.

Good point with the ultra sonic humidifiers. It would be so interesting to have a look into these specific particles and their potential high or low health impacts.