If you think San Diego smog is bad look at Beijing pollution issues.
http://www.cbs8.com/story/24466643/beijing-air-pollution-at-dangerously-high-levels
This is one of the many reason why you must have your car smog checked every year here in California. Car emissions that are not maintained are major sources of pollution here in the US and in some overseas countries. Its up to us to think of the future and stop the pollution from spreading. Please make sure your car has a smog check every year and help fight pollution to keep our city beautiful.
