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The Valley Breath Report

What the Central Valley is breathing this week.

Our weekly read on pollen, mold, and air quality for Fresno & Merced — with plain-language guidance from our board-certified team.

Updated dailyFresno & Merced
August 17, 2026 · 6:33 AM PDT
Updated 22 hours ago
Grass Pollen
Very Low
Tree Pollen
Not available
Weed Pollen
Very Low
Mold Spores
Not available
Air QualityPreliminaryModerate
AQI 53
OzonePreliminaryGood
Good
More detail
PM2.5 (fine particles)Moderate
PM10 (coarse particles)Good
Temperature70°F
Humidity61%
Wind Speed5 mph
Active Fire Detections3 detected
Nearest Fire26 km away
Sources: Google — Pollen API (forecast model) · U.S. EPA — AirNow · NOAA — National Weather Service · NASA LANCE and FIRMS (satellite fire detections). Updated 22 hours ago (August 17, 2026 · 6:33 AM PDT). General information only — not a substitute for medical advice.
7-day outlook

How the week is shaping up

Overall pollen + air-quality trend. Sample pattern shown.

How to read it

What we track, and why

Pollen & mold

Tree, grass, and weed pollen plus mold spores — the Valley's most common outdoor triggers. Levels shift fast with wind and heat.

Air quality & smoke

AQI, ozone, and wildfire smoke. On action days, sensitive groups — including people with asthma — may want to limit time outdoors.

What you can do

Each report includes practical, plain-language steps — and a reminder that we're here to help you build a longer-term plan.

Real-time air quality alerts

When wildfire smoke or an AQI action day hits the Valley, we post a same-day alert here and on social. Subscribe to get it in your inbox.

Get alerts

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One short email a week — plus a same-day note when air quality takes a turn. No spam, unsubscribe anytime.

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Symptoms keeping up with the pollen?

Book a visit and we'll work with you to understand your triggers and build a plan designed to help.

General information only — not medical advice. Please consult a qualified provider for assessment. Sierra Allergy works with many insurance plans; contact us to verify your coverage.