A new method to combine IBA of fine aerosols with Radon-222 to determine source characteristics

On a site-by-site basis, radon was well correlated with black carbon and potassium and particularly during winter when domestic heating constitutes a distributed source. However, in summer the correlation of radon with BC and K was poor indicating that the distribution of these sources varies over the summer fetch region. Radon was also positively correlated with silicon and titanium, but the correlation coefficient for the entire data set was smaller than for black carbon. In summer and winter, when fetch regions were constrained by the prevailing meteorology, silicon and titanium showed a better correlation with radon. A small negative correlation was seen between sodium (a marker for sea salt) and radon.