Robust Confidence Intervals for PM(2.5) Concentration Measurements in the Ecuadorian Park La Carolina

In this article, robust confidence intervals for PM(2.5) (particles with size less than or equal to [Formula: see text]) concentration measurements performed in La Carolina Park, Quito, Ecuador, have been built. Different techniques have been applied for the construction of the confidence intervals, and routes around the park and through the middle of it have been used to build the confidence intervals and classify this urban park in accordance with categories established by the Quito air quality index. These intervals have been based on the following estimators: the mean and standard deviation, median and median absolute deviation, median and semi interquartile range, [Formula: see text]-trimmed mean and Winsorized standard error of order [Formula: see text] , location and scale estimators based on the Andrew’s wave, biweight location and scale estimators, and estimators based on the bootstrap- [Formula: see text] method. The results of the classification of the park and its surrounding streets showed that, in terms of air pollution by PM(2.5), the park is not at caution levels. The results of the classification of the routes that were followed through the park and its surrounding streets showed that, in terms of air pollution by PM(2.5), these routes are at either desirable, acceptable or caution levels. Therefore, this urban park is actually removing or attenuating unwanted PM(2.5) concentration measurements.