From the Air Force Times:
A record July for planes over Afghanistan
Aug 5 -Warplanes dropped a record number of bombs over Afghanistan in July, reflecting the intensity of combat in the mountainous nation.
According to Air Forces Central, 515 bombs were released, the highest number ever for a July and the third-highest total for any month since the start of 2004. In June, 646 bombs were dropped. The record was set in August 2007, when 670 bombs were released.
The weapons count underplays the number of airstrikes because it does not include cannon rounds from fighters and AC-130 gunships or small rockets launched by warplanes... (link)