Not able to use a typical AC-powered fan, used a 12V car/truck radiator fan, a DC17-55V to DC12V adapter, and a PWM motor module as both a power switch and speed regulator, 4 14x20 inch MERV13 filters and some old 2x2s to build the frame.
It moves a LOT of air at full power (~120W), but very much on the noisy side!
"Katowice z najlepszą jakością powietrza od dekady! 🌬️ ❤️
Z roku na rok poprawia się jakość powietrza w Katowicach. Dane Głównego Inspektoratu Ochrony Środowiska pokazują, że rok 2023 charakteryzował się najlepszą jakością powietrza w porównaniu do lat ubiegłych.
Dla wskaźnika PM10 (parametr określający ilość zawieszonych w metrze sześciennym powietrza cząsteczek o średnicy nieprzekraczającej 10 mikrometrów) średnia miesięczna w ubiegłym roku wyniosła 24,3 podczas gdy w roku 2022 było to 28,5, w 2021 – 31, w 2020 – 29, w 2019 – 32,2, w 2018 – 40, a w 2017 – 41, natomiast w 2010 r. średnioroczny wskaźnik PM10 wyniósł 52.
Porównując rok 2023 i 2022 ilość pyłu zawieszonego PM10 spadła o blisko 15%, a w ciągu ostatnich 10 lat o ponad 42%."
Air and light pollution are both scourges of modern life in many world cities. #AirPollution affects the brightness of the night sky, and #LightPollution at night may make daytime #AirQuality worse. Find out why addressing both issues makes good #PublicPolicy sense.
Higher levels of CO2 increase survival of viruses in the air & transmission risk
“We knew SARS-CoV-2, like other viruses, spreads through the air we breathe. But this study represents a huge breakthrough in our understanding of exactly how and why that happens, and crucially, what can be done to stop it.
“It shows that opening a window may be more powerful than originally thought . . . causing the virus to become inactivated much faster"
An unprecedented wildfire season in Canada last year made headlines as smoke spread across major cities in North America. What do meteorologists expect in 2024?
Interesting to see how a candle pollutes the air in my living room. This is from Sunday night.
The top graph shows a sharp peak of particulates in the air when I blew out the candle. The other two show organic compounds and CO2 building up slowly and falling after the candle is out.
"More than 200 chemical plants across the country will be required to curb the toxic pollutants they release into the air under a regulation announced by the Biden administration on Tuesday.
The regulation is aimed at reducing the risk of cancer for people living near industrial sites. This is the first time in nearly two decades that the government has tightened limits on pollution from chemical plants."
In the Copernicus #HealthHub, users can access data that enable to improve our physical and mental well-being, such as data on #AirQuality or the impact of #ClimateChange
Would anyone care to recommend a CO2 monitor I can prop up next to my desk to remind me when to ventilate?
Bonus marks if it's both powered and portable, so I can occasionally take it to meetings and opt out when things get too muggy. I don't care about recording numbers over time. UK purchase.
Are there online resources to figure out why air quality is bad?
It's Sunday and holiday, and cars seem to have disappeared from the streets. Were there so many barbecues yesterday?
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The real cost of the west's consumerism and outsourcing of production to locations with no environmental laws in place.
Smoke signals
One of India’s most pressing environmental issues is air quality. A global report from air monitoring firm IQAir, published last week, found that a stunning 83 of the 100 worst polluted cities in the world are in India, with Delhi named as the most polluted capital city having averaged a PM2.5 of 102.1 µg/m3 in 2023.
While Bangladesh and Pakistan were named as the most and second-most polluted nations overall, India was third, with an annualized average concentration of fine particulate matter (PM2.5) measuring 54.4 µg/m3 last year — more than 10x the WHO guideline of 5 µg/m3.
Very high #SaharanDust concentrations predicted to continue this weekend for the Iberian Peninsula by #CopernicusAtmosphere regional forecast. Stay informed about possible hazards with your national and local #airquality services.