Lessons From the Past, pt.1: California

Dear all, here is a short documentary on California's battle against air pollution. 

The smog in California in the mid 20th century was mostly comprised of O3. In present-day China, O3 often overtakes particulate matter as the primary pollutant during the summer months, when less coal is burnt. Tropospheric ozone is formed by the reaction of NOx, CO and volatile organic compounds (VOC) with sunlight, all of which are, to a large extent, linked to vehicle exhaust. With the coal cap in energy consumption and the expansion of the  automative market, the significance of O3 is expected to increase. 

California's precious experiences include coordination and cooperation between the state, local authorities ("air districts") and the academia, a strong government for enforcement as well as the involvement of the market mechanism and the public sector.