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It is primarily caused by diesel engines in urban areas.
Medium or high concentrations of ozone are a good indicator that poor visibility conditions are due to pollution.Most haze is caused by coal-fired emissions from power plants.Medium and high levels of fine particle concentrations are a strong indication that poor visibility is due in large part to pollution.As you look at the scene and check it against the visibility data, you may wonder if the scene is as clear as it could be or if haze or fog is affecting the view.Here are some tips to help you interpret what you are seeing.
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Fine particles also form when gasses such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) react and condense in the atmosphere.