The City of Brass is both smart and very entertaining. The richness of the world Chakraborty has created gives added hef

Across the United States, from school buildings to bars famous for their drag queen shows, staff are installing air purifiers in an effort to reduce the spread of Covid-19 and reassure people that indoor spaces are still safe to visit.

This book has a little of everything — palace politics, ancient djinn and their blood rivalry, a chosen-one character arc, badass female warriors/magicians, and a love triangle that is delightful and heart-breaking at the same time.

Taleb discusses a three-step strategy to turn every misfortune into an opportunity. His approach has helped me rethink some of my worst personal failings and visualise them as chances to make myself better.

Nahri is a con woman of unsurpassed talent, hustling for a living on the streets of 18th century Cairo. Ali is the second son of King Ghassan of Daevabad — a djinn who doesn’t hesitate to give up all he has to bring equality between the djinn and shafit (half-bloods, or children of djinn with humans). Their paths cross when Nahri unknowingly summons Dara, a daeva who saves her from ghouls in Cairo and takes her to Daevabad.

As a result, manufacturers say they’ve never been busier. Austin Air Systems in Buffalo, New York, has ramped up production to nearly 2,000 purifiers per day, says Michael Domon, vice president of sales at the firm, which supplies schools, banks, call centers, and even the Department of Defense. “Everything I produce, every single day, I ship out the very next day.”

To offer readers a sense of how indoor conditions increase risk, German newspaper Die Zeit has come up with an interactive tool that explains how aerosol load increases depending on factors such as the size of room, how well ventilated it is, and how loudly people are talking.

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jokes if they’re not funny. Don’t treat them like a genius if they aren’t. Fragile egos can’t survive real relationships. If you start coddling someone, you’re going to get stuck doing it for the rest of your life, or until you finally decide to dump them.

When buying an air purifier, avoid terms such as “HEPA-style” and similar — it could mean the filter inside the device is not as effective as a true HEPA filter. Some central ventilation filters are labelled with minimum-efficiency reporting value ratings (MERVs). But for portable air purifiers, HEPA filters are generally considered the gold standard. Also, if you have a purifier with a lower-quality filter, it’s unlikely you can modify it to accept a HEPA filter, says Joachim Curtius, PhD, an aerosol scientist at Goethe University Frankfurt.

Air Purifiers, Air Filters, and the Best DIY Hacks to Reduce the Coronavirus Risk How to clear the air in your home to protect against airborne Covid-19 transmissionelemental.medium.com

Purchasers will also want to consider the square footage of the space in which they want to use the purifiers — manufacturers generally advise what coverage you can expect for a given purifier, and you might need more than one. And another really important factor is the air changes per hour (ACH) rating, which tells you how frequently the purifier will cycle the air in its allotted space — five ACH means five changes per hour, and so on. Hospital rooms might have 20 or even 40 air changes per hour via commercial systems. For general use, six is a decent rule of thumb, though, suggests William Bahnfleth, PhD, a professor of architectural engineering at Penn State University. It means you can expect the air to be cleaned roughly every 10 minutes.

Finally, there’s the clean air delivery rate (CADR), a rating on some purifiers that have been certified by the Association of Home Appliance Manufacturers (AHAM). The CADR defines how quickly a purifier can rid the air of specific types of particles, including dust and smoke — which may be roughly in the same size range as aerosols bearing SARS-CoV-2. These ratings don’t refer specifically to virus-cleaning capabilities, but experts suggest using a purifier with a tobacco smoke CADR that is roughly two thirds of the square footage of the room you want to use it in. So, a CADR of 200 in a room that is 300 sq ft, for instance, would indicate the device can be expected to efficiently remove bioaerosol-sized particles from the air.

If viruses are what you want to remove from the air, ventilation experts generally recommend you get an air purifier or cleaner with a high-efficiency particulate air (HEPA) filter. These thick, spongy filters contain a mass of fibers that trap airborne material. They cover a wide range of particle sizes and are 99.7% efficient at snaring matter that is 0.3 microns in diameter. Thanks to the strange physics of tiny particles, those 0.3-micron particles are harder to catch than either smaller or larger ones. For specks and droplets that are smaller or larger than 0.3 microns, including bioaerosols of between 0.7 and 10 microns, HEPA filters are even more than 99.7% efficient.

The Centers for Disease Control and Prevention (CDC) notes that air purifiers, when used appropriately, can reduce airborne contaminants including viruses. But mask-wearing, distancing, and other measures are not done away with by air purifiers. “By itself, air cleaning or filtration is not enough to protect people from exposure to the virus that causes Covid-19,” says the Environmental Protection Agency (EPA). If you have a well-ventilated, uncrowded home, or you work in a building with a central ventilation system that cycles air rapidly and has good-quality filters installed, you might not need any purifiers. But if, in other circumstances, you want to add a helpful tool to your arsenal to help you lower the risk of airborne transmission, ahead is a guide detailing what you should consider when buying an air purifier — and how to think about them as potential components in your wider arsenal of defenses against Covid-19.

Across the United States, from school buildings to bars famous for their drag queen shows, staff are installing air purifiers in an effort to reduce the spread of Covid-19 and reassure people that indoor spaces are still safe to visit. Homeowners are also turning to them to protect their families. (This year’s massive wildfires have also increased demand.)

This summer, evidence mounted that the coronavirus could be transmitted via aerosols as well as larger droplets expelled when people cough or sneeze but which fall to the ground relatively quickly. Everyone produces aerosols as they breathe or speak and the virus-laden mist, invisible to the naked eye, that is emitted by an infectious person can build up inside a room if the air supply is not refreshed or cleaned.