{"id":12624,"date":"2020-11-17T06:17:18","date_gmt":"2020-11-16T22:17:18","guid":{"rendered":"https:\/\/smartairfilters.com\/?p=12624"},"modified":"2021-06-17T11:41:19","modified_gmt":"2021-06-17T03:41:19","slug":"wind-reduces-air-pollution-not-rain","status":"publish","type":"post","link":"https:\/\/smartairfilters.com\/en\/blog\/wind-reduces-air-pollution-not-rain\/","title":{"rendered":"Wind, Not Rain, Reduces Air Pollution"},"content":{"rendered":"It’s wind, not rain, that reduces air pollution. It sounds so simple, yet on rainy days, many people believe it’s the rain that’s “washing away” air pollution.\n\n\"Myth:\n\nData shows otherwise. Rain is poor at clearing air pollution<\/a> from the skies. Most of the time, it’s wind that blows pollution away and lowers overall air pollution levels.\n

Blue Skies After a Storm? Thank the Wind.<\/h2>\nAn analysis of 6 years of pollution and weather data in Beijing found that wind was a much stronger factor than rain. Fine particulate pollution (PM2.5) correlated strongly with wind\u00a0(r\u00a0<\/em>= -.37) but almost not at all with rain (r\u00a0<\/em>= -.04).\n\nIf so, why do so many people believe <\/strong>rain reduces pollution? A likely reason for this confusion is that wind normally accompanies rain. Rain often comes from changing weather fronts, which bring both rain and wind. It’s this same wind that blows out the pollution.\n\nFrom our perspective on the ground, it\u2019s easy to think the pollution has been \u201cwashed\u201d away. In reality, most of the pollution actually gets blown away by the winds, resulting in lower air pollution levels and blue skies.\n\nBefore the storm:\n\n\"Beijing\n\nAfter the storm:\n\n\"Beijing\n

Data Shows Wind Reduces Air Pollution<\/h2>\nResearchers in Lanzhou charted how a cold front and its wind helps reduce air pollution levels. Here\u2019s what happened to pollution when a cold front moved in one day in November:\n\n\"Cold\n\nWhen the wind picked up, PM2.5 fell approximately 66% from top to bottom. Compare that to the effect of rain. Moderate rainfall decreased particulate pollution by just 1.45%. Even the heaviest rains reduced fine particulate by just 8.71%.\n\n\"Effect\n

Wind Direction Matters<\/h2>\nWhen the wind kicks up, it can blow away pollution\u2014especially the small particles of PM2.5<\/a>. In Beijing, that works the best when the wind comes from the less-polluted areas to the north. But when the wind comes from the south, pollution actually gets worse.\n\n\"Where\n\nWhy would southern wind hurt Beijing air quality?\n
    \n \t
  1. The areas south of Beijing are heavily industrialized.<\/li>\n \t
  2. Southern winds trap air against the mountains to the north and west of Beijing. Essentially, southern winds force us in Beijing to stew in our own pollution.<\/li>\n<\/ol>\nFor more on the effect of wind, check out this analysis of wind and pollution in Shanghai<\/a>.\n\n
    Bottom Line<\/div>
    Bottom Line: How Wind Reduces Air Pollution Levels<\/div>
    Data shows that rain has a relatively small impact on reducing air pollutants (0-30%), but the wind that comes with a storm can have a larger effect.<\/span> Wind direction can also have an impact, depending on if the wind is coming from a more or less polluted area. Simple steps<\/span><\/a> can be taken to protect against air pollution both indoors and outdoors.<\/span> <\/div>
    Smart Air<\/div><\/div>\n

    How Can I Protect Myself Against Air Pollution?<\/h3>\nAir pollution is a near-inevitable effect of economic activity, so how can we fight against the harmful effects of air pollution to our health? The simple answer is: an air purifier. You might have seen the plethora of air purifiers on the market, with ludicrous prices up to the thousands. But clean air need not (and should not) only be a luxury! Smart Air’s mission is to make clean air accessible and affordable to all, and we began with the cheapest purifier: the DIY purifier.\n

    WATCH: Combatting Air Pollution with a DIY Purifier<\/h3>\n
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    Smart Air Workshop | How to Combat Air Pollution with a DIY Purifier<\/div><\/div>
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