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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.
Resources & Links
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Follow JASPR:
JASPR’s website: jaspr.co
JASPR on Instagram: @jasprco
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.
https://drive.google.com/file/d/1uvGa0F3UC_Jc-HsPNiFm157c0VPfjz3i/view 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.
https://drive.google.com/file/d/1NH95L3_JogwIo_NSTsDGEayC0qwr1vgX/view
Extra reading:
Do I Need to Worry About Airborne Microplastics? (TIME)
You’re Breathing Microplastics: Here’s What You Can Do About It (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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