A New Approach to Setting Vehicle Emission Standards

The Annual Average: An Alternative to the Second Highest Value as a Measure of Air Quality

“…In Figure 5 it is seen that for the 99 "station-years" of New Jersey CO data (1968-73) the relationship between the standard deviation and annual average has a slope of 0.56 (i.e., coefficient of variation is 0.56) which is a little larger than the 0.49 observed in the CAMP data. 2 The standard deviation-annual average relationship for the 1972 U.S. data (82 stations) had a slope of 0.53 which was not significantly different from 0.5. Figure 6 shows that for the New Jersey data the annual average is a good predictor of the percent of the time the CO standard is exceeded.…”

The Need for Representative Ambient Air Carbon Monoxide Sampling

“…Conclusions // the carboxyhemoglobin study published in the AMA Journal 5 was of a representative sample of the population in the cities studied, and if the CAMP data on which trend analysis was performed came from uniformly sited analyzers, 7 then the resulting correlation may be indeed highly significant: the required reductions in measured ambient CO levels may be directly related to the COHb concentration of the population. However, if this is not the case, the CO abatement strategies should be…”

“…If only the five cities from which CAMP data were available are considered, however, the correlation is significant at the 90% confidence level with a correlation coefficient at 0.87. mean value of data from several cities using CAMP data. 7 This may indicate that a different technique should be considered as the basis for evaluating CO data. The data considered were taken only from CAMP stations for which several years data were available.…”

Interim evaluation of strategies for meeting ambient air quality standard for photochemical oxidant

“…The linear rollback formula of Equation 1 has been widely used to estimate reductions required to meet ambient air quality standards for various pollutants (8)(9)(10). It has been most widely used for CO control.…”

“…Figure8. Fractional reduction in hydrocarbon emissions based on the federal ambient air quality standard of 0.24 ppmC, 3-hr average, as determined by linear rollback.…”