KRONOS WORLDWIDE, INC. ANNOUNCES A PRICE INCREASE FOR ALL

TITANIUM DIOXIDE PRODUCTS SOLD IN NORTH AMERICA

CRANBURY, NEW JERSEY – July 10, 2009 – Kronos Worldwide, Inc. (NYSE:  KRO) today announced a price increase for all titanium dioxide grades sold in North America.

Effective August 1, 2009, or as contracts permit, prices for all Kronos titanium dioxide grades sold in North America will be increased by US$ 0.03 per pound.

This is a new price increase announcement and is in addition to the price increase announcement made on May 5, 2009, which is currently being implemented.

Kronos Worldwide, Inc. is a major international producer of titanium dioxide pigments.

*****