In 2013, emissions of TPM were 669 kt, a decrease of 27 kt (4%) from 2012 emission levels. Emissions of PM10 decreased in 2013 by 5 kt (1%) from 2012 emission levels, to 393 kt. A decline of 6 kt (2%) was also observed for PM2.5, to 306 kt. Overall, between 1990 and 2013, emissions of all three sizes of particulate matter decreased by more than 50%.