The California Smog Check Program requires vehicles that were manufactured in 1976 or later to participate in the biennial (every two years) smog check program in participating counties. The program's stated aim is to reduce air pollution from vehicles by ensuring that cars with excessive emissions are repaired in accordance with federal and state guidelines.
With some exceptions, gasoline-powered vehicles, hybrid vehicles, and alternative-fuel vehicles that are eight model-years old or newer are not required to participate; instead, these vehicles pay a smog abatement fee for the first 8 years in place of being required to pass a smog check. The eight-year exception does not apply to nonresident (previously registered out-of-state) vehicles being registered in California for the first time, diesel vehicles 1998 model or newer and weighing 14,000 lbs or less, or specially constructed vehicles 1976 and newer. The program is a joint effort between the California Air Resources Board, the California Bureau of Automotive Repair, and the California Department of Motor Vehicles.
A Smog Check is not required for electric vehicles, diesel-powered vehicles manufactured before 1998 or weighing over 14,000 lbs, trailers, motorcycles, or gasoline-powered vehicles 1975 or older. In April 2015, hybrid vehicles became subject to smog check requirements. Although vehicles 1975 and older or diesel vehicles 1997 or older are not required to get a smog check, owners of these vehicles must still ensure that their emissions systems are intact.
Anyone wishing to sell a vehicle that is over four years old must first have a smog check performed. It is the seller's responsibility to get the smog certificate prior to the sale. If the vehicle is registered in California and was acquired from a spouse, domestic partner, sibling, child, parent, grandparent, or grandchild it is exempt.
California's history with smog According to the California EPA, "Californians set the pace nationwide in their love affair with cars". The state's 34 million residents own approximately 25 million cars—one for every adult aged 18 years or older.
Smog is created when nitrogen oxides () and hydrocarbon gases (HC) are exposed to sunlight. The five gasses monitored during a smog check are hydrocarbons, carbon monoxide (CO), nitrogen oxides (NOx), carbon dioxide (CO2), and oxygen (O2).
Impact on human health In 1998 the Air Resource Board identified diesel particulate matter as carcinogenic. Further research revealed that it can cause life-shortening health problems such as respiratory illness, heart problems, asthma, and cancer. Diesel particulate matter is the most common airborne toxin that Californians breathe.
Between 2005 and 2007 air pollution led to almost 30,000 hospital and emergency room visits in California for asthma, pneumonia, and other respiratory and cardiovascular ailments. A study by RAND Corporation showed the cost to the state, federal and private health insurers was over $193 million in hospital-based medical care. John Romley lead author of the study. said "California's failure to meet air pollution standards causes a large amount of expensive hospital care." According to the American Lung Association, California's dirty air causes 19,000 premature deaths, 9,400 hospitalizations and more than 300,000 respiratory illnesses including asthma and acute bronchitis.
A study of children living in Southern California found that smog can cause asthma. The study of over 3,000 children showed those living in high-smog areas were more likely to develop asthma if they were avid athletes, when compared to children who did not participate in sports.
More people in California live in areas that do not meet federal clean air standards than in any other state. A report by the American Lung Association states that some areas in California are the most polluted in the United States, with air quality that is likely damaging the health of millions of people. The report finds that Los Angeles, Bakersfield (CA), and Visalia-Porterville (CA) rank among the five U.S. cities most polluted with particulates and ozone.
Impact on global warming Carbon dioxide (CO2) is a greenhouse gas that is associated with global warming. Vehicles are a significant source of CO2 emissions and thus contribute to global warming. According to an advocacy group Environmental Defense, in 2004, automobiles from the three largest automakers in the US – Ford, GM, and DaimlerChrysler – contributed CO2 emissions that were comparable to those from the top 11 electric companies.
Historically, California was hottest in July and August, but as climate change takes place, the temperature may be extended from July through September, according to a report from the team established by the Air Resource Board. Some climate change simulations indicate the global warming impact on California will be an increase in the frequency of hot daytime and nighttime temperatures. The climate change simulations also indicate that drying in the Sacramento area may be evident by the mid 21st century. The California sea level has risen at about 7 inches per century, but this trend could change with global warming. According to the report by the Climate Action Team, “[t]he sea-level rise projections in the 2008 Impacts Assessment indicate that the rate and total sea-level rise in future decades may increase substantially above the recent historical rates”. While all sectors are vulnerable to rising sea-levels, 70 percent of those at risk are residential areas. Hospitals, schools, water treatment plants, and other buildings may be at risk of flooding.
Climate change may also affect California's diverse agricultural sector, since it is likely to change precipitation, temperature averages, pest and weed ranges, and the length of the growing season (this affecting crop productivity). In one study, researchers looked at the possible effects on the agricultural sector in the US and identified some possible effects. Results suggested that climate change will decrease annual crop yields in the long-term, especially for cotton.
Climate change in California could also impact energy consumption. Demand patterns for electricity might be affected as the mean temperatures and the frequency of hot days increases, increasing demand for cooling in summertime.
Causes of smog Air pollution has two primary sources, biogenic and anthropogenic. Biogenic sources are natural sources, such as volcanoes that spew particulate matter, lightning strikes that cause forest fires, and trees and other vegetation that release pollen and spores into the atmosphere.
Californian greenhouse gas emissions come mostly from transportation, utilities, and industries including refineries, cement, manufacturing, forestry, and agriculture. In 2004, transportation accounted for approximately 40 percent of total greenhouse gas emissions in California. About 80 percent of that came from road transportation.
Population growth increases air pollution, as more vehicles are on the road. California's large population significantly contributes to the high amount of smog and air pollution in the state. In 1930, California's population was less than six million people and the total registered vehicles were two million.
Topography California has a unique topography which contributes to some of the problems; the warm, sunny climate is ideal for trapping and forming air pollutants. On hot, sunny days, pollutants from vehicles, industry, and many products may chemically react with each other. In the winter, temperature inversions can trap tiny particles of smoke and exhaust from vehicles and anything else that burns fuel. This keeps pollution closer to the ground.
History of the Smog Check Program In 1974 American automobiles manufactured on or after 1966 required a smog inspection upon change of ownership in California by a licensed MVPC Class A Installer/Adjuster technician (Smog Check I). An aftermarket " kit" would be installed on all 1966 to 1973 American automobiles (under 6001 GVW) to lower Nitrous Oxide emissions. After the 1973 model year, automobile manufacturers were required to install factory devices (usually in the form of EGR valves) on all cars sold in California. HC and CO (hydrocarbon and carbon monoxide) limits at idle were also checked by an infrared exhaust analyzer and manually recorded by the technician. A $50 repair cost limit was imposed on vehicles that did not pass emission standards. The first truly comprehensive “Smog Check” program was implemented in March 1984. It came about as a result of "SB 33" which was passed in 1982. The program included a biennial and change of ownership testing, "BAR 84" emissions test plus a visual and functional inspection of various emission control components, a $50 repair cost limit (unless emission device tampering was noted), licensing shops to perform smog checks and mechanic certification for emissions repair competence. The program is generally known as “BAR 84” program. During the BAR 84 program, the first acceleration simulation mode (ASM) test was implemented which tests for two gases, HC and CO (hydrocarbons and carbon monoxide) while the vehicle was run at 2500 RPM for 30 seconds (static test). EGR device functions were also manually tested for lower emissions.William E. Heinz licensed MVPC Class A Installer/Adjuster Technician 1979 to 1984; BAR84 Smog Check Repair Technician until 1990.
Automobiles with a motor swap performed prior to the March 19, 1984 mandate which was older than the model year of the vehicle e.g. a 1970 LT-1 350 swapped into a 1975 Chevrolet with the 1970 smog gear intact (with documentation e.g. receipts) are considered noncompliant illegal engine swaps including nonstock exhaust swaps e.g. dual catalytic converters with a true dual exhaust not original to the vehicle - this means that the engine swap performed after the date of enactment must be the same model year or newer. Engine swaps which are the same year or newer where the vehicle class did not have it as a manufacturer option (from a Chevrolet S-10 with a late model LSx powertrain transplant with the associated smog gear intact salvaged from the donor vehicle which includes the OBDII diagnostic connections and associated exhaust system with the catalytic converter attached including the secondary downstream oxygen sensor (catalytic converter must be California legal which has a serial number and build date mandated under California state law) must be approved by a 'referee' smog test station where the engine/transmission package is certified where a silver tag is stickered to the door jamb. Although the engine may be newer than the vehicle model year even with an OBDII upgrade the automobile must be tested based on the model year using the test criteria based on the VIN and registration. This means that even with an OBDII powertrain upgrade regardless of the engine swap being 1996 and newer, the vehicle being smogged must be tested using BAR97 criteria, not the OBDII standard procedure.
In 1997 important laws were passed that made significant changes to Smog Check II. AB 57 created a financial assistance program. AB 208 provided funding for low-income assistance and vehicle retirement AB 1492 exempted vehicles less than four years old from the biennial smog check AB 42 exempted vehicles manufactured before 1978 from smog check testing. Also required that vehicles 20 years old or older be exempt from the Smog Check program starting in 2004. AB 42 established a brief rolling chassis exemption until it was repealed in 2006 where 1976 and newer vehicles were subjected to emission testing.