The National Weather Service is forecasting west winds will push the smoke out of the Valley this afternoon. Please refer to , the fact sheet issued by the Yosemite Safety Office on Wildfire Smoke and Public Health and statements issued by the Mariposa County Health Department,. Yosemite soil has very, very low levels of nitrogen due to the nitrogen-poor granite that comprises its soil; the short, dry growing season; and the prevalence of fires that burn off nitrogen from soils. The burning of fossil fuels and some agricultural emissions from sources west of Yosemite cause most of the pollution. Spring, summer, and fall are all busy seasons for fire whether from management-ignited prescribed fires, or managed lightning ignited fires. As of Thursday morning, the fire had claimed more than 23,000 acres and was 7% contained, according to InciWeb.
Portions of the park tend to be smokier in the afternoon, according to visitors. More: More: More: The Empire Fire is burning in heavy pockets of dead and down timber. Ozone Another air quality problem, , threatens human health and park plants. Updates on the fire can be found in the. But outside of Yosemite in the community of Mariposa, Highway 140 is closed due to the wildfire. The fire is burning in a dense portion of the forest with areas of heavy tree mortality. These measurements, combined with more recent estimates of dry deposition, suggest that the deposition of nitrogen from the atmosphere to the Sierra, especially in the fragile high elevations, is up to five times higher than the 19th-century levels.
The fire is threatening nearly 1,500 structures near Lake McClure, Calif. The cause of the fire is still under investigation, though lightning appears to be the likely culprit. Ozone Ozone and Human Health in Yosemite Because ozone pollution near the ground is usually only a concern on hot, sunny days, the ozone season runs May through September. Here is a short list of actions which can be taken to reduce or avoid impacts. The trail and the cables will remain closed through Thursday, September 11. Portable and stationary particulate monitors are placed in areas that are most likely to see impacts of smoke during certain hours of the day.
For this location, data from monitoring sites located at 37. Help support these webcams and provide for the future of Yosemite by today. Campfires Some Yosemite campgrounds have many campsites and campfires. Why it matters: The fire has already burned about 17,300 acres, and was only 5% contained as of July 17. Minimize the use of swamp coolers. Yosemite National Park, in cooperation with state and other federal agencies, monitors the damage caused by air pollution with a comprehensive, science-based air resources program.
Forest Service with assistance from Cal Fire. Drivers should use Highway 120 or Highway 41 instead. Down low, tropospheric ozone can damage both plant and animal tissues, especially leaf or lung tissue. Do not vacuum, because vacuuming stirs up particles already inside your home. Unfortunately, 100 years of fire suppression has left much of Yosemite's lower elevations overgrown. Automobiles, power plants, and factories are the main producers, and most ozone, like the haze that obscures Yosemite's vistas, is caused by precursors blown over from urban source regions to the west. The fire is burning west of Yosemite near Jerseydale Campground in Mariposa, Yosemite Cedar Lodge and Indian Flat Campground, and the historic Savage Trading Post.
Additionally, pet owners should consider bringing their pets indoors out of the unhealthy air conditions, if possible. According to the air quality monitor for Yosemite, the levels of particulate matter have been increasing, and as of Monday morning, the California Smoke Information blog suspected that conditions could worsen. Allowing fires to burn naturally can result in a healthier, more diverse ecosystem. Natural fires that are inevitable in the Sierra during dry summer months can impair Yosemite's air quality as well, though the impacts are usually localized. View of Half Dome from the floor of Yosemite Valley Tuesday morning. Visitors to ask about visiting this week or this weekend. The redesigned site has a modern layout and can be viewed from your phone, computer, or tablet.
Smoke is expected to be heavy in the immediate fire area and adjacent communities. Even during the most severe ozone pollution events, ozone levels are often lower in Yosemite than in the Central Valley, which has some of the most unhealthy ozone levels in the country. These unhealthy days often coincide with days that are unhealthy in the Central Valley, to the west, which is the primary source of this ozone. Yosemite is designated a Class I area under the Clean Air Act, which affords Yosemite the highest level of federal air quality protection. Yosemite Air Quality Monitoring Smoke and Particulate Monitoring View at Turtleback Dome just west of Yosemite Valley. Air quality at the park has gone from moderate to unhealthy in just a matter of days. When visiting Yosemite, it is possible to see fire and smoke at any time of the year.
We work closely with local districts to maintain that conditions are within legal limits and not posing threats to people in nearby communities. If you are sensitive to smoke, you may consider visiting an area of Yosemite where fire or smoke is not present, and taking any other precautions that will help lessen smoke-related health problems. Overall, we want you to have a positive experience visiting or living near Yosemite, while also learning about fire's important role in the ecosystem. When is Ozone Usually a Human Health Concern in Yosemite? The background of the chart is color coded and relates to the for particulate matter, which is designed to protect human health. Smoke and Fire Our worst days of visibility in Yosemite are caused by.
The smoke is causing unhealthy amounts of particulate pollution to drift into the park, and is contributing to poor visibility as well. Pesticides Pesticides are heavily used in California's Central Valley, and these pesticides accompany the ozone and haze that blow in and deposit themselves to Yosemite's landscape. Ozone injury can be cumulative and cause coughing, sinus inflammation, chest pains, scratchy throat, even permanent lung damage and reduced immune functions. During the federal government shutdown, this website will not be updated and may not reflect current conditions. Use the map or search bar to locate wildland fire and other natural resource incidents.
The standard is exceeded when the 24-hour concentrations go above 35 micrograms per cubic meter. The Lost Arrow spire is adjacent to Upper Yosemite Fall. Specifically, the park plans to research how lichen serves as an indicator of nitrogen deposition as it varies over areas of the park. Yosemite National Park can be reached at 209 372-0200 for automated updates about weather and road conditions. At sites like these, ozone is often reaches levels unhealthy for sensitive individuals asthmatics or others with respiratory ailments. As two fires burn in portions of the park, officials are warning visitors of the dangers of breathing in the smoke-filled air. Westerly winds can then blow that pollution into Yosemite on a regular basis, especially during the summer.