Arizona Drivers Could Help Polluters Earn Emissions Credits
Published Date: 11/5/2026
Rule
Summary
The EPA just gave a thumbs-up to Maricopa County’s new plan that lets folks earn credits by swapping old cars for cleaner ones. These credits help big polluters balance out their emissions, making the air fresher for everyone. This change kicks in on December 7, 2026, and could save money by encouraging cleaner rides instead of costly pollution fixes.
Analyzed Economic Effects
4 provisions identified: 2 benefits, 2 costs, 0 mixed.
Fleet owners can earn emission credits
If you operate a captive on‑road vehicle fleet in Maricopa County, you can generate emission reduction credits (MERCs) by permanently retrofitting or replacing existing vehicles with lower‑emitting vehicles under MCAQD Rule 205. Rule 205 is federally enforceable as of December 7, 2026, and requires that the baseline vehicle be permanently removed from the nonattainment area or rendered permanently disabled and disposed of, that replacements be certified to the same or lower emission standard, and that generators follow monitoring, recordkeeping, and reporting and the MERC quantification method in Appendix A (MOVES‑based) unless an alternative is approved by the Department and the EPA.
Major sources may use MERCs for NNSR offsets
If you own or run a major stationary source in Maricopa County proposing increased NOX or VOC emissions, you may use MERCs generated under Rule 205 as offsets to meet Nonattainment New Source Review (NNSR) permit requirements. The major source thresholds noted in the rule background are 100 tons per year (tpy) for NOX and VOC in Moderate ozone nonattainment areas and 70 tpy for PM10 in Serious PM10 areas; the required offset ratio for Moderate ozone areas is at least 1.15 to 1, and for Serious PM10 areas is at least 1 to 1.
Cap on total mobile‑source credits
Maricopa planners (MAG) will add a line item of 1,000 tpy of NOX and 500 tpy of VOC into the emissions inventory to represent the maximum number of MERCs and nonroad engine credits (NERCs) that will be creditable through Rule 205 and Rule 204. This effectively caps the total amount of MERCs/NERCs that can be used for SIP/NNSR purposes under these rules.
Long‑term compliance and permit obligations
If you generate MERCs, your MERC authorization will be reflected in permits that include monitoring, recordkeeping, and reporting requirements; Rule 205 requires tracking (including a 20‑year tracking requirement for replacement vehicles), and permit transfer procedures under MCAQD Rule 200 apply if the business changes hands. MERCs issued under the SIP are federally enforceable once the EPA's approval is effective.
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