The standard meal allowance for meals while traveling outside your tax home is the federal M&IE rate.
Most major cities and many other localities in the United States are designated as high-cost areas, qualifying for higher standard meal allowances.
Note that in any case, the standard meal allowance is also subject to the 50% allowable deduction for business related meals.
Lodging allowances are more specific to a specific locality. The allowance rates can be found here: http://www.gsa.gov/portal/content/104877