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What we're looking at: Erupting volcanoes spew hazardous sulfur dioxide gas. If conditions are right, that gas and other pollutants can settle with moisture and dust to create a haze called volcanic smog, or "vog," with tiny sulfuric acid droplets.If it rains when it's voggy, you get acid rain.What causes it: We've had vog already, but mostly south of the island over the ocean, because trade winds have largely been keeping it away.But the winds are expected to calm down Thursday and Friday, possibly allowing the vog to settle over more of the island.It should rain over the Big Island on Thursday into Saturday. The vog's sulfuric acid droplets would fall, too -- thus, acid rain.How it impacts people: Vog seems to be the more immediate health concern. At higher concentrations, vog can cause headaches and irritation to the lungs and eyes, the University of Hawaii at Hilo saysHigh levels of acidic particles in vog "can induce asthma attacks, especially in adolescents, and can also impede the ability of the upper respiratory tract to remove other potentially harmful particles," the USGS says.For people with asthma and other respiratory problems, "the effects are much more serious, causing a tightening of the airways in the lungs and making it very difficult to breathe," the university says.But it adds: "There's been no clear evidence that vog causes lingering damage to normally healthy individuals."How acid rain affects human health is more complicated.Walking in acid rain or swimming in a lake affected by it "is no more dangerous to humans than walking in normal rain or swimming in non-acidic lakes," the Environmental Protection Agency says.But acid rain can contaminate household water supplies by leaching metals from building and plumbing materials, the USGS says. That includes rooftop rainwater-catchment systems that Hawaii residents use for drinking water. 1912
We see testing as an important initial step to a multi-layered approach that we believe validates the industry's commitment to making health, safety, and the well-being of the passengers, the crew, and the communities we visit our top priority, officials concluded.Last week the CDC extended its no-sail order to Oct. 31.The no-sail order, which initially began in April, prohibits cruise ships from carrying 250 passengers in waters subject to US jurisdiction.Information about whether the cruise members would use rapid or nasal swab tests or if they would test passengers days before boarding the boat was not available. 623
Vista Unified School District-- The district's Child Nutrition Services department will serve meals during the weeks of March 16-20 and March 23-27. Meal services will not be provided during the spring break week of March 30-April 3. 233
Two days ago, three county schools -- Madison High School, Vista High School, and Innovation?Middle School -- also received threats that were determined to be unsubstantiated. Extra security was present at those campuses. 221
We can get people out of harm's way -- flooding regions -- and make their way to safe shelters, he said. "What we're doing is making sure people can pass through, they can weather the storm." 191
来源：资阳报