Why Do Your Allergies Get Worse Indoors?

Why do allergies get worse indoors? JASPR founder Mike Feldstein, a former wildfire and mold remediation pro, explains what HEPA labels leave out and why airflow (CADR) matters more than filter efficiency. He also shares what household dust reveals about microplastics, and why he calls air fresheners the new secondhand smoke. Sponsored by JASPR. Use code MOTLEY.

EXCLUSIVE LISTENER OFFER Use code MOTLEY for $300 off a JASPR air scrubber for the first two weeks after this episode drops. After that, code MOTLEY is still good for $200 off.

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JASPR'S LAB STUDIES (third-party testing by LMS Labs, commissioned by JASPR) Microplastic-sized particle test (latex beads), March 2025: removed about 98.7% of particles 0.016–10 microns in 60 minutes in a 4,000 cu ft chamber. CADR: 276 CFM.

drive.google.com/file/d/1uvGa0F3UC_Jc-HsPNiFm1… Mold test (Aspergillus niger), February 2025: removed 97.1% of airborne mold spores in 60 minutes and 99.7% in 90 minutes. CADR: 236 CFM (drive.google.com/file/d/1uvGa0F3UC_Jc-HsPNiFm1…).

drive.google.com/file/d/1NH95L3_JogwIo_NSTsDGE…

Extra reading:

Do I Need to Worry About Airborne Microplastics? (time.com/article/2026/05/07/airborne-microplas…) (TIME)

You’re Breathing Microplastics: Here’s What You Can Do About It (jaspr.co/en-ca/blogs/news/you-re-breathing-mic…)(JASPR)

Chapters:

0:00 Why your allergies follow you inside

0:34 Sponsor note and intro: Mike Feldstein of JASPR

2:22 From wildfire and mold jobs to clean air

4:35 The smoke-damaged home that re-contaminated in a week

7:08 Why big-box purifiers couldn't keep up

8:55 COVID, dentists, and the nine-minute room

12:28 "HEPA is kind of..." what the label really means

14:59 Why HEPA catches the tiniest particles best

15:58 99% of $1 or 95% of $5: why airflow wins

17:08 The new filter, and the trees behind the carbon

23:40 What your air-quality light can't see

24:55 Microplastics: what your dust is telling you

31:30 Snoring, sleep divorce, and seasonal allergies

37:20 The 80/20: air, water, light

39:19 Your air freshener is the new secondhand smoke

42:14 Smell your food before you eat

45:33 A school built around clean air

55:54 The MOTLEY code and the 30-day guarantee

59:25 Lung chi and the wrap

1:02:02 Disclaimer

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