$25M awarded for bus replacements, retrofits
The South Coast Air Quality Management District in California provides $16.6 million to help school districts buy new CNG school buses. Private operators get $8.8 million to retrofit older diesel buses with particulate traps.
DIAMOND BAR, Calif. — In one of its largest school bus funding awards, the South Coast Air Quality Management District (AQMD) on May 7 awarded $16.6 million to help school districts replace older diesel school buses with new, cleaner-burning compressed natural gas (CNG) buses.
The agency also awarded $8.8 million to help private operators retrofit 545 diesel school buses with particulate traps to reduce diesel emissions.
The action will allow six school districts to replace a total of 96 pre-1987 diesel school buses with cleaner-burning CNG buses, as well as provide funding for the necessary fueling infrastructure.
The school bus awards and retrofits approved by AQMD include:
School District | # of CNG buses | Total Funding Award |
Castaic | 1 | $169,524 |
Walnut Valley | 2 | $331,048 |
Downey | 2 | $339,048 |
Bonita | 5 | $847,620 |
Hacienda/La Puente | 6 | $993,144 |
Los Angeles | 80 | $13,561,920 |
Private School Bus Operator
# of PM Traps
Total Funding Award
Aerocoach
1
$20,000
Alliance Bus lines
2
$40,000
Certified Transportation
20
$400,000
Durham Services
32
416,000
First Student
291
$4,514,500
Richmond
1
$20,000
Tumbleweed
68
$884,000
Atlantic Express
130
$2,600,000
Since 2000, AQMD has approved more than $177 million to replace more than 1,000 older diesel school buses with cleaner models and retrofit 3,536 newer diesel school buses with particulate traps.
AQMD is the air pollution control agency for Orange County and major portions of Los Angeles, San Bernardino and Riverside counties.
More Alternative Fuels

CALSTART and Forth Combine to Form Catalyst Mobility
The new name represents a renewed vision for the nonprofit focused on advancing clean, equitable, and affordable transportation solutions that move people and goods.
Read More →
Alt-Fuel Moves: New Buses, Charging Hubs & Real-World EV Testing
Propane and electric school bus deployments continue to grow as districts add new vehicles, expand charging infrastructure, and gather more real-world operating data.
Read More →
Fewer Electric School Bus Models Reshape the U.S. Market
WRI’s latest buyer’s guide points to a consolidating electric school bus market, but fewer options may reflect a maturing industry rather than fewer meaningful choices for school bus operators.
Read More →
The Fuel Budget You Can Actually Predict: How Propane Autogas Keeps Money in the Classroom
Learn how propane autogas helps school districts manage fuel costs with predictable pricing, lower maintenance, and reduced emissions from former transportation director Joel Stutheit.
Read More →
Hendrickson, Driventic Introduce New Electric Powertrain for School Buses
ELECTRAAX, the electrified, lightweight drive axle offers integrated ePowertrain efficiency and modular flexibility for Class 6–7 school bus use.
Read More →
The Mobility House Joins PowerFlex in Fleet Electrification Deal
The acquisition combines intelligent charging software, bidirectional charging expertise, and fleet electrification services to support the growing adoption of electric school buses across North America.
Read More →
Alt-Fuel Moves: Electric School Bus Investments Hit the Road
See which districts across the U.S. are putting electric school buses into service, expanding charging infrastructure, and planning the next phase of fleet electrification.
Read More →
With Fuel Volatility Ahead, School Districts Turn to Propane
While diesel prices peaked above $5 this spring, districts with propane autogas-powered fleets paid under $2 per gallon, according to PERC.
Read More →
EPA Unveils Proposed Changes to 2027 Heavy-Duty Engine Rules
The federal agency has proposed changes to next year’s targets that would eliminate DEF derates, ease warranty requirements, and retain current NOx emissions standards.
Read More →
Alt-Fuel Moves: EV Charging & Infrastructure Projects Gain Momentum
The latest developments include new funding, charging infrastructure, utility investments, and fleet technologies designed to support the transition to electric school buses nationwide.
Read More →
