California Smoke Information: Tuesday August 18, 2015 - Shasta-Trininty/Six Rivers Smoke Report (revised)

Forecast conditions represent impacts from smoke. Contributions from ozone and other pollutants are not reflected.

Smoke Synopsis: (revised 1040 am)

Yesterday smoke remained entrenched in most of the deep Humboldt and Trinity County river valleys, conditions which are expected to persist through Wednesday afternoon. The ridge of high pressure continues to sit over northern California, again limiting smoke dispersion from area fires until late afternoon. A weak upper-air low pressure trough will begin to affect the area late Wednesday, with a bit more clearing and smoke dispersion through Friday before the high pressure ridge returns for the weekend.

Coastal sections may see a return of a marine layer today and tomorrow, enhanced with the fine smoke particles, but inland valleys are expected to remain choked by residual and newly produced smoke. The northern Sacramento Valley and western Siskiyou County should also begin to see some increased smoke impacts, while smoke aloft will be evident over much of the rest of northern California.

Fire behavior increased a little Monday afternoon in extremely hot and dry conditions, which is also expected to persist the next couple days.

Air Quality Outlook: Shasta-Trinity & Six Rivers Complexes
Site	Tuesday August 18, 2015	Wednesday August 19, 2015	Thursday August 20, 2015	Comments
Crescent City	Moderate	Moderate	Good
Gasquet	Moderate	Moderate	Moderate
Happy Camp	Unhealthy	Unhealthy	Moderate
Etna	Unhealthy	Unhealthy	Moderate
Mt. Shasta	Moderate	Moderate	Moderate
Tulelake	Moderate	Moderate	Good
Yreka	Moderate	Moderate	Moderate
Eureka	Moderate	Moderate	Moderate	Some inland canyons may see higher concentrations of smoke.
Hoopa	Very Unhealthy	Very Unhealthy	Very Unhealthy
Mad River/Dinsmore	Very Unhealthy	Very Unhealthy	Very Unhealthy
Orleans	Unhealthy	Unhealthy	Unhealthy
Weitchpec	Unhealthy	Unhealthy	Unhealthy
Willow Creek	Hazardous	Hazardous	Very Unhealthy	Worst conditions in the early afternoon, improving towards evening.
Burnt Ranch	Hazardous	Hazardous	Very Unhealthy	Conditions improve mid-afternoon into the evening hours.
Hayfork	Hazardous	Hazardous	Hazardous	Conditions tend to worsen as the morning progresses, then improve throughout the afternoon into early evening.
Hyampom	Hazardous	Hazardous	Hazardous	Worst conditions in the morning, improving by mid-afternoon into the early evening.
Weaverville	Unhealthy	USG	USG	Best in the afternoon.
Anderson/Redding	Moderate	Moderate	Moderate
Disclaimer: Forecast conditions represent air quality levels affected by fine particulates; contribution from ozone and other pollutants is not reflected. Conditions may change quickly, these projections are based on anticipated weather and fire activity. Sensitive groups including individuals with asthma, lung or heart disease, children, older adults, and pregnant women should take precautions to avoid exposure to smoke. If you feel as though you are having health effects from smoke, see your doctor or health professional as needed. In some cases your eyes are your best tools. If it is smoky outside, you are being impacted. Use caution when driving in or around smoky areas.

AQI Index	Actions to Protect Yourself
Good	None
Moderate	Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion.
Unhealthy for Sensitive Groups - USG	People with heart or lung disease, children and older adults should reduce prolonged or heavy outdoor exertion. Everyone else should limit prolonged or heavy exertion.
Unhealthy	The following groups should avoid all physical outdoor activity: People with heart or lung disease, children and older adults. Everyone else should avoid prolonged or heavy exertion.
Very Unhealthy	Everyone should avoid any outdoor exertion; people with respiratory or heart disease, the elderly and children should remain indoors.
Hazardous	The following groups should remain indoors and keep activity levels low: People with heart or lung disease; children and older adults. Everyone else should avoid prolonged or heavy exertion