The US Federal Aviation Administration (FAA) has awarded a total of $24.5m in environmental grants to deliver significant upgrades to 11 airports across the country.
The grants have been awarded under the FAA's voluntary airport low-emissions (VALE) programme and zero emissions airport vehicle (ZEV) programmes.
The VALE and ZEV programmes will help fund the installation of pre-conditioned air units, and the purchase of vehicles producing zero exhaust emissions.
In addition, the grant will fund infrastructure construction or modification required for the maintenance of the vehicles along with other electrical power upgrades across the airports.
The FAA has granted $23.4m to nine airports under the VALE programme, which aims to reduce all sources of airport ground emissions in areas that do not meet air quality standards.
Chicago O'Hare International has been granted $2m and Memphis International will receive $1.3m for purchasing and installing ground power units (GPUs) and pre-conditioned air (PCA) units.
Baltimore-Washington International Thurgood Marshall will receive $2.5m, with $2.7m for Port Columbus International, Ohio; $1.6m will go to William P Hobby, Houston, and Cleveland Hopkins International will receive $1.1m to purchase and install GPUs and PCAs for passenger gates.
Phoenix Sky Harbor International will receive $1m for installing 28 charging stations in terminal four for electric ground service equipment.
Birmingham-Shuttlesworth International has been granted $2.6m to purchase seven clean fuel burning vehicles and a refuelling station.
Indianapolis International has been awarded $3.9m to purchase and install 12 GPUs and 22 stationary pole lights, which will replace diesel-powered lights, helping light-up ramp operations on the cargo apron.
Under the ZEV programme, a total of $955,088 has been granted to two airports.
Hartsfield-Jackson Atlanta International will receive $926,789 to purchase one electric shuttle bus for passenger service across the terminals. In addition, the grant will fund infrastructure needed to charge the vehicle, including one wireless inductive charging pad and one long-term charging area.
Lambert-S. Louis International will receive $28,299 to fund four electric utility carts for on-airport emergency services and other uses.