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Rather than fixing the cause, Bangkok tries to spray its smog away using water cannons
mardi 29 janvier 2019, 20:48 , par BoingBoing
Bangkok, Thailand is now considered one of the top 10 polluted cities in the world, according to Global News. And to combat the problem, Bangkok is attacking the smog with water cannons.
Thai authorities used water cannons on Monday in an effort to combat Bangkok’s air pollution. Masks were also provided after hazardous dust particles reportedly reached an Air Quality Index (AQI) of 180. Any level above 150 is considered unhealthy and Bangkok ranked in the top 10 of polluted cities worldwide on Monday. The particles, known as PM 2.5, are a mixture of liquid droplets and solid particles that can include dust, soot and smoke. Diesel fumes contributed up to 60 per cent of the pollution while burning rubbish and crops attributed about 35 per cent. And it appears they've even begun to add sugar-infused water, hoping the added sugar will trap the more dangerous pollutants, even though the sweet water could end up causing mold. Via Oddity Central: Thai media reported that in a desperate attempt to bring down critical air pollution levels in Bangkok, local authorities started experimenting with sweetened water, instead of regular one. The idea behind the bizarre pollution-fighting strategy is that by increasing the viscosity of the water using sugar will allow it to trap more dangerous particles when sprayed into the air. However, some experts believe that the unconventional approach could do more harm than good. Dr. Weerachai Putthawong, a professor of organic chemistry at Kasetsart University, told Workingpoint News that he has serious doubts that the sweetened water will yield better results than regular water. He claims that the increased viscosity of the liquid won’t make much of a difference, because the equipment used to spray it isn’t powerful enough to pulverize it into small enough droplets to catch dust and particulate matter as small as 2.5 microns in size. The current machines used to spray the water can only catch particles down to 10 microns. To make matters worse, the added sugar could cause the surfaces the mixture lands on to develop dangerous mold, as the organic additive would allow bacteria and fungi to develop. Rather than trying to wash away a problem that will immediately return once the water runs out, why not clamp down on Bangkok's diesel fumes and trash burning, which are causing the problem in the first place? It'll be interesting to see how this turns out.
https://boingboing.net/2019/01/29/rather-than-fixing-the-cause.html
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