Because it got worse in the afternoon with the sun at its zenith leads me to believe it's photochemical smog. To fix that they'll need to get all the dirty vehicles off the road, and put a cap on pollutants produced by the industrial estates. What Causes Photochemical Smog? A chemical reaction between solar ultraviolet radiation and an atmosphere polluted with hydrocarbons and oxides of nitrogen causes photochemical smog. This is especially common from automobile exhaust. Smog can happ
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