Tire air pressure charts for automobiles are located on AA1Car.com and at InfoBarrel.com, as of 2015. CRW.com and CyclingAbout.com also publish air pressure charts for bicycle tires.
The tire pressure chart at AA1Car.com gives the recommended tire pressure when considering outside temperature. The website also gives tire safety tips. The InfoBarrel.com chart gives the recommended tire pressure when considering tire size and load weight.
CRW.com gives recommended bicycle tire pressure by tire size and load weight. The site also includes tire safety tips for bicyclists. CyclingAbout.com has two charts, one for tire size in inches, and one for metric tires. Both charts provide maximum recommended pressure for front and rear tires.