Figure 2 presents a summary of the mean PM2.5 concentrations measured at the two sites in Guadalajara.
Individual PM2.5 concentrations ranged from 35 to 179 μg m–3 at Centro (n=37) and from 22 to 214 μg m–3 at Miravalle (n=39).
The PM2.5 concentration results indicate that 79% of the samples are over the Mexican air quality standard of 65 μg m–3 during 24–h, not to be exceeded by more than 2% of the measurements in a year (NOM–025–SSA1–1993).