If ozone is invisible, why is there poor visibility on Spare The Air days?
Poor visibility is caused by two factors: • The reddish-brown haze that you often see hanging over the valley is Oxides of Nitrogen, better known as NOx. NOx is converted into ozone air pollution when it “cooks” in the direct ultraviolet rays from the sun. The air districts of the Sacramento region are committed to developing programs to reduce NOx, which will decrease ozone air pollution and improve visibility • Fine particles, consisting mainly of by-products from internal combustion engines like automobiles, contribute to reduced visibility.
