At first glance it's a major drag. It's such a big issue! How can anyone have any impact on it? An obvious solution would involve lots of pollution-cleansing and sound-mitigation screens, to the point where you feel reassured and secure. Well, if living machines can transform waste water, and community gardens can unite all walks of life in the goal of nurturing, maybe individuals can do their bit. And maybe it can be a beautiful bit.
"Emissions from industrial facilities and electric utilities, motor vehicle exhaust, gasoline vapors, and chemical solvents are some of the major sources of nitrogen oxides and volatile organic compounds. Nitrogen dioxide is the main component in ground level smog and produced by combustion or heat in buses, cars, truck engines from the gasoline and diesel fuel...Car or truck engines that are idling during peak traffic hours releases twice as many exhaust fumes than other vehicles in motion because there are lesser amounts of intake air. The chemical and exhaust emission levels from cars and trucks result in the formation of nitrogen dioxides and hydrocarbons from the incomplete burning of gas and diesel fuels during combustion."
(from Applied Ozone Systems website, http://www.appliedozone.com/smog_buster.html)