Photochemical smog is formed when emissions containing nitrogen oxide, such as car exhaust, interact with volatile organic compounds in the presence of sunlight. The oxygen in the compounds and the heat from the sunlight react to form ground-level ozone.Know More
Smog requires sunlight, nitrogen oxides, volatile organic compounds and temperatures of at least 18 degrees Celsius to form. Sunlight breaks down nitrogen dioxides into nitrogen oxide and atomic oxygen molecules. The free atomic oxygen then reacts with atmospheric oxygen to form ozone, which is a necessary shield against radiation in the atmosphere, but harmful to life at ground level. While ozone also forms naturally under normal atmospheric conditions even at ground level, it is normally consumed by ambient nitrogen oxide. Pollution introduces volatile organic compounds that provide an alternate means for that nitrogen oxide to react, which means that the ozone is not consumed and can potentially reach toxic levels.
Smog represents a grave threat to the health of plants, humans and animals, according to the Environmental Protection Agency. Smog can irritate respiratory systems, aggravate chronic lung conditions and asthma, and even cause permanent lung damage. Smog causes damage to forests, crops and other green life and can destroy large swaths of vegetation.Learn more in Pollution
The two types of smog are sulfurous and photochemical. Smog is defined as community-wide polluted air. The name was derived from the words smoke and fog.Full Answer >
A STAR smog check station is one that meets the exacting standards that have been set by California's Bureau of Automotive Repair (BAR), and is certified to check vehicle emissions for every type of car on the market. These standards are above and beyond the criteria that non-STAR stations are required to meet. Vehicles that have failed previous smog inspections at a non-STAR station, or those of a type that often fails smog inspections must have vehicle emissions tests done at STAR stations.Full Answer >
A STAR station smog check is smog check done at a station that is closely monitored by the Bureau of Automotive Repairs. The BAR has a higher standard for vehicle smog checks than other stations.Full Answer >
STAR smog check stations inspect vehicles for compliance with emissions standards in the state of California. Drivers may be selected randomly for inspection; certain types of vehicles may be required to have an inspection.Full Answer >