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Coronavirus, News, Observation

What is the best mask for COVID-19? A mechanical engineer explains the science after 2 years of testing masks in his lab

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1. What changed in the CDC guidelines?

The CDC currently recommends that you “wear the most protective mask you can that fits well and that you will wear consistently.” The question, then, is what type of mask offers the best protection for you – by filtering the air you breathe in – and for those around you – by filtering the air you breathe out?

The CDC’s updated guidelines clearly lay out the hierarchy of protection: “Loosely woven cloth products provide the least protection, layered finely woven products offer more protection, well-fitting disposable surgical masks and KN95s offer even more protection, and well-fitting NIOSH-approved respirators (including N95s) offer the highest level of protection.”

From a performance standpoint, the N95 and KN95 masks are the best option. While supply chain limitations led to the CDC recommending people not wear N95s early in the pandemic, today they are easily obtainable and should be your first choice if you want the most protection.

The biggest change in the new guidelines has to do with cloth masks. Previous guidance from the CDC had said that some cloth masks could offer acceptable levels of protection. The new guidance still acknowledges that cloth masks can offer a small amount of protection but places them at the very bottom of the bunch.

N95 masks are made from a tangled web of tiny plastic fibers that are very effective at trapping particles. Alexander Klepnev via Wikimedia Commons, CC BY-SA

2. What’s the difference between N95, surgical and cloth mask materials?

The effectiveness of a mask – how much protection a mask provides the wearer – is a combination of two major elements. First, there’s the ability of the material to capture particles. The second factor is the fraction of inhaled or exhaled air leaking out from around the mask – essentially, how well a mask fits. 

Most mask materials can be thought of as a tangled net of small fibers. Particles passing through a mask are stopped when they physically touch one of those fibers. N95s, KN95s and surgical masks are purpose-built to be effective at removing particles from air. Their fibers are typically made from melt-blown plastics, often polypropylene, and the strands are tiny – often less than four thousandths of an inch (10 micrometers) in diameter – or approximately one third the width of a human hair. These small fibers create a large amount of surface area within the mask for filtering and collecting particles. Although the specific construction and thickness of the materials used in N95, KN95 and surgical masks can vary, the filter media used are often quite similar.

These fibers are very tightly packed together so the gaps a particle must navigate through are very small. This results in a high probability that particles will end up touching and sticking to a fiber as they pass through a mask. These polypropylene materials also often have a static charge that can help attract and catch particles. 

Cloth masks are typically made of common woven materials such as cotton or polyester. The fibers are often large and less densely packed together, meaning particles can easily pass through the material. Adding more layers can help, but stacking layers has a diminishing return and the performance of a cloth mask, even with multiple layers, will still typically not match that of surgical mask or N95.

3. How much does fit matter for masks?

Fit is the other major component in how effective a mask is. Even if the materials used in a mask were perfect and it removed all particles from the air that passed through it, a mask can offer protection only if it doesn’t leak.

When you breathe in and out, air will always take the path of least resistance. If there are any gaps between a mask and someone’s face, a substantial fraction of every breath will seep out through those gaps and the mask will provide relatively little protection. 

Many cloth mask designs simply do not seal well. They are not stiff enough to push against the face, there are gaps where the mask doesn’t even come in contact with the face and it is not possible to cinch them tightly enough against the skin to form a decent seal.

But leaking is a concern for all masks. Although the materials used in surgical masks are quite effective, they often bunch and fold on the sides. These gaps provide an easy route for air and particles to leak out. Knotting and tucking surgical masks or wearing a cloth mask over a surgical mask can both significantly reduce leakage.

N95 masks aren’t immune to this problem either; if the nose clip isn’t securely pushed against your face, the mask is leaking. What makes N95s unique is that a specific requirement of the N95 certification process is making sure the masks can form a good seal.

4. What is different about omicron?

The mechanics of how masks function is likely no different for omicron than any other variant. The difference is that the omicron variant is more easily transmitted than previous variants. This high level of infectiousness makes wearing good-quality masks and wearing them correctly to limit the chances of catching or spreading the coronavirus that much more critical.

Unfortunately, the attributes that make for a good mask are the very things that make masks uncomfortable and not very stylish. If your cloth mask is comfy and light and feels like you are wearing nothing at all, it probably isn’t doing much to keep you and others safe from the coronavirus. The protection offered by a high-quality, well-fitting N95 or KN95 is the best. Surgical masks can be very effective at filtering out particles, but getting them to fit correctly can be tricky and makes the overall protection they will provide you questionable. If you have other options, cloth masks should be a last choice.

Originally published on The Conversation by Christian L’Orange and republished under a Creative Commons License

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News, Observation, Politics

While Americans Sleep, Our Corporate Overlords Make Progress Impossible

Both the Republicans and the Democrats vote as if the nation’s middle-class taxpayer is a sleeping sucker.

by Ralph Nader

“Polarization” is the word most associated with the positions of the Republicans and Democrats in Congress. The mass media and the commentators never tire of this focus, in part because such clashes create the flashes conducive to daily coverage.

Politicians from both parties exploit voters who don’t do their homework on voting records and let the lawmakers use the people’s sovereign power (remember the Constitution’s “We the People”) against them on behalf of the big corporate bosses.

The quiet harmony between the two parties created by the omnipresent power of Big Business and other powerful single-issue lobbyists is often the status quo. That’s why there are so few changes in this country’s politics.

In many cases, the similarities of both major parties are tied to the fundamental concentration of power by the few over the many. In short, the two parties regularly agree on anti-democratic abuses of power. Granted, there are always a few exceptions among the rank & file. Here are some areas of Republican and Democrat concurrence:

1. The Duopoly shares the same stage on a militaristic, imperial foreign policy and massive unaudited military budgets. Just a couple of weeks ago, the Pentagon budget was voted out of a House committee by the Democrats and the GOP with $24 billion MORE than what President Biden asked for from Congress. Neither party does much of anything to curtail the huge waste, fraud, and abuse of corporate military contractors, or the Pentagon’s violation of federal law since 1992 requiring annual auditable data on DOD spending be provided to Congress, the president, and the public.

2. Both Parties allow unconstitutional wars violating federal laws and international treaties that we signed onto long ago, including restrictions on the use of force under the United Nations Charter.

3. Both Parties ignore the burgeoning corporate welfare subsidies, handouts, giveaways, and bailouts turning oceans of inefficient, mismanaged, and coddled profit-glutted companies into tenured corporate welfare Kings.

4. Both Parties decline to crack down on the nationwide corporate crime spree. They don’t even like to use the phrase “corporate crime” or “corporate crime wave.” They prefer to delicately allude to “white-collar crime.”

Trillions of dollars are at stake every year, yet neither party holds corporate crime hearings nor proposes an update of the obsolete, weak federal corporate criminal laws.

In some instances, there is no criminal penalty at all for willful and knowing violations of safety regulatory laws (e.g., the auto safety and aviation safety laws). Senator Richard Blumenthal (D-CT) is trying to find just one Republican Senator to co-sponsor the “Hide No Harm Act” that would make it a crime for a corporate officer to knowingly conceal information about a corporate action or product that poses the danger of death or serious physical injury to consumers or workers.

5. Both Parties allow Wall Street’s inexhaustibly greedy CEOs to prey on innocents, including small investors. They also do nothing to curb hundreds of billions of dollars in computerized billing fraud, especially in the health care industry. (See, License to Steal by Malcolm K. Sparrow and a GAO Report about thirty years ago).

6. The third leading cause of death in the U.S. is fatalities from preventable problems in hospitals and clinics. According to the Johns Hopkins School of Medicine study in 2015, a conservative estimate is that 250,000 people yearly are dying from preventable conditions. Neither Congress nor the Executive Branch has an effort remotely up to the scale required to reduce this staggering level of mortality and morbidity. Nor is the American Medical Association (AMA) engaging with this avoidable epidemic.

7. Both Parties sped bailout of over $50 billion to the airline industry during Covid-19, after the companies had spent about $45 billion on unproductive stock buybacks over the last few years to raise the metrics used to boost executive pay.

8. Both Parties starve corporate law enforcement budgets in the Justice Department, the regulatory agencies, and such departments as Labor, Agriculture, Interior, Transportation, and Health and Human Services. The Duopoly’s view is that there be no additional federal cops on the corporate crime beat.

9. Both Parties prostrate themselves before the bank-funded Federal Reserve. There are no congressional audits, no congressional oversight of the Fed’s secret, murky operations, and massive printing of money to juice up Wall Street, while keeping interest rates near zero for trillions of dollars held by over one hundred million small to midsize savers in America.

10. Both Parties are wedded to constant and huge bailouts of the risky declining, uncompetitive (with solar and wind energy) nuclear power industry. This is corporate socialism at its worst. Without your taxpayer and ratepayer dollars, nuclear plants would be closing down faster than is now the case. Bipartisan proposals for more nukes come with large subsidies and guarantees by Uncle Sam.

11. Both Parties hate Third Parties and engage in the political bigotry of obstructing their ballot access (See: Richard Winger’s Ballot Access News), with hurdles, harassing lawsuits, and exclusions from public debates. The goal of both parties is to stop a competitive democracy.

12. Both Parties overwhelmingly rubber-stamp whatever the Israeli government wants in the latest U.S. military weaponry, the suppression of Palestinians and illegal occupation of the remaining Palestinian lands, and the periodic slaughter of Gazans with U.S. weapons. The Duopoly also supports the use of the U.S. veto in the UN Security Council to insulate Israel from UN sanctions.

13. Continuing Republican Speaker Newt Gingrich’s debilitating internal deforms of congressional infrastructures, the Democrats have gone along with the GOP’s shrinking of committee and staff budgets, abolition of the crucial Office of Technology Assessment’s (OTA) budget, and concentration of excessive power in the hands of the Speaker and Senate leader. This little noticed immolation reduces further the legislature’s ability to oversee the huge sprawling Executive Branch. The erosion of congressional power is furthered by the three-day work week Congress has reserved for itself.

14. Even on what might seem to be healthy partisan differences, the Democrats and the GOP agree not to replace or ease out Trump’s Director of the Internal Revenue Service, a former corporate loophole tax lawyer, or the head of the U.S. Postal Service, a former profiteer off the Post Office who will shortly curtail service even more than he did in 2020 (See: First Class: The U.S. Postal Service, Democracy, and the Corporate Threat, by Christopher W Shaw).

Right now, both Parties are readying to give over $50 billion of your tax money to the very profitable under-taxed computer chip industry companies like Intel and Nvidia, so they can make more profit-building plants in the U.S. These companies are loaded with cash. They should invest their own money and stop the stock buyback craze. Isn’t that what capitalism is all about?

Both Parties vote as if the American middle-class taxpayer is a sleeping sucker. Politicians from both parties exploit voters who don’t do their homework on voting records and let the lawmakers use the people’s sovereign power (remember the Constitution’s “We the People”) against them on behalf of the big corporate bosses.

Sleep on America, you have nothing to lose but your dreams.

Originally published on Common Dreams by RALPH NADER and republished under a Creative Commons license  (CC BY-NC-ND 3.0).

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