Test of the cosmic transparency with the standard candles and the standard ruler

In this paper, the cosmic transparency is constrained by using the latest baryon acoustic oscillation (BAO) data and the type Ia supernova data with a model- independent method. We find that a transparent universe is consistent with observational data at the 1 sigma confidence level, except for the case of BAO+ Union 2.1 without the systematic errors where a transparent universe is favored only at the 2 sigma confidence level. To investigate the effect of the uncertainty of the Hubble constant on the test of the cosmic opacity, we assume h to be a free parameter and obtain that the observations favor a transparent universe at the 1s confidence level.