To find the correct tire pressure:
1. Check the sticker on your driver's side doorjamb. This sticker will specify the recommended tire pressure for your Alero's tires. This is the most reliable source. It will list pressures for both the front and rear tires, and possibly different pressures depending on the load.
2. Check your owner's manual. The owner's manual will also list the recommended tire pressure information.
3. Check the tire sidewall. The tire sidewall will have information including the maximum pressure the tire can handle. This is *not* the recommended pressure; use the doorjamb sticker or owner's manual first.
Do not rely on a general answer found online. Always check your vehicle's documentation for the correct information. Improper tire pressure can affect handling, fuel economy, and tire wear.