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Air Quality Fact

But the biggest challenges may lie ahead. Maintaining what we have may be the biggest challenge yet. Even in our cleanest year, the Bay Area is still not in attainment with State ozone and particulate matter (PM) standards. Expected increases in population, motor vehicle ownership and distances traveled and climate change will exacerbate this situation and could turn the clock back if we do not begin to address these issues now.

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Spare the Air Status

Tuesday, 5/22
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Wednesday, 5/23
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Engine Compliance Schedule For Agricultural Diesel Engines

The ATCM allows in-use diesel engines that do not comply with any of the Tier 1-4 emissions standards - also referred to as "uncertified" or "Tier 0" Engines - to be operated up until a designated compliance date as long as the engines were registered with the local air pollution control agency. Tier 1 and Tier 2 engines need to be in compliance by the 2015-2016 timeframe, or 12 years after initial installation, whichever is later.

Table 6: Emission Standards
Non-certified (Tier 0) Greater than 50 BHP In-Use Stationary
Diesel-Fueled Engines Used in Agricultural Operations
See Title 17, CCR, Sections 93115.8(b)(2) and (4)
Horsepower Range
(hp)		 Application Compliance
On or After December 31		 Diesel PM
Not to Exceed
(g/bhp-hr)		 HC, NOx, NMHC+NOx,
and CO
Not to Exceed
(g/bhp-hr)
Greater Than 50
But Less Than 75		 Generator Sets 2015 0.02 Off-Road CI Engine Certification Standards for an off-road engine of the model year and maximum rated power of the engine installed to meet the applicable PM standard.1
All Applications 2011 0.30
Greater Than or Equal to 75
But Less Than 100		 Generator Sets 2015 0.01
All Applications 2011 0.30
Greater Than or Equal to 100
But Less Than 175		 Generator Sets 2015 0.01
All Applications 2010 0.22
Greater Than or Equal to 175
But Less Than or Equal to 750		 All Applications 2010 0.15
Greater Than 750 All Applications 2014 0.075

1. If no limits have been established for an off-road engine of the same model year and maximum rated power, then the in-use stationary diesel-fueled engine used in an agricultural operation shall not exceed Tier 1 standards in Title 13, CCR, Section 2423 for an off-road engine of the same maximum rated power irrespective of model year.

Table 7: Emission Standards
Tier 1- and Tier 2-Certified Greater than 50 BHP In-Use Stationary
Diesel-Fueled Engines Used in Agricultural Operations
See Title 17, CCR, Sections 93115.8(b)(3) and (4)
Horsepower Range
(hp)		 Compliance
On or After December 31		 Diesel PM
Not to Exceed
(g/bhp-hr)		 HC, NOx, NMHC+NOx,
and CO
Not to Exceed
(g/bhp-hr)
Greater Than 50
But Less Than 75		 2015 or 12 years after the date of initial installation, whichever is later 0.02 Off-Road CI Engine Certification Standards for an off-road engine of the model year and maximum rated power of the engine installed to meet the applicable PM standard.1
Greater Than or Equal to 75
But Less Than 175		 2015 or 12 years after the date of initial installation, whichever is later 0.01
Greater Than or Equal to 175
But Less Than or Equal to 750		 2014 or 12 years after the date of initial installation, whichever is later 0.01
Greater Than or Equal to 750 2014 or 12 years after the date of initial installation, whichever is later 0.075

1. If no limits have been established for an off-road engine of the same model year and maximum rated power, then the in-use stationary diesel-fueled engine used in an agricultural operation shall not exceed Tier 1 standards in Title 13, CCR, Section 2423 for an off-road engine of the same maximum rated power irrespective of model year.

Last Updated: 10/4/2010