anchor: , changes in PM concentrations of less than 0.25 eg/m3), in both 2010 and 2020, but more substantial improvements for a large percentage of the population, including improvements in excess of 2 eg/m3 for more than 24 million individuals by 2020.
positive: A large percentage of the population saw a significant improvement in PM concentrations.
negative: The population, in general, did not improve its PM concentrations.