AEROSPACE
The aerospace category includes manufacturers and suppliers of civil, military, and business aircraft, helicopters, unmanned aircraft systems, space systems, aircraft engines, missiles, materiel, and related components, equipment, services, and information technology.

AGRICULTURE
In addition to food crops and livestock, the agriculture category includes field crops such as cotton or tobacco.  Agriculture employs approximately 42 percent of the world's laborers.

AIR POLLUTION CONTROL MANUFACTURERS
This category includes system and component suppliers of monitoring and control technologies for PM, NO_x, SO₂, Hg, VOCs and other HAPs.

ASPHALT | AGGREGATE | HOT MIX  
The industry includes manufactures of hot mix asphalt, asphalt refiners, asphalt paving contractors, testing labs, consulting engineers, and product suppliers.

AUTOMOBILE ASSEMBLY
The automobile assembly industry designs, develops, manufactures, markets, and sells the world's motor vehicles.

BOILER MANUFACTURERS AND REPS
Manufacturers of commercial, institutional, industrial and electricity-generating boiler systems.

BURNER MANUFACTURERS AND REPS
Burner manufacturers and representatives frequently require emissions data to demonstrate burner performance under varying operating conditions.

CONTINUOUS EMISSION MONITORING SYSTEMS
A continuous emission monitoring system (CEMS) is the total equipment necessary for the determination of a gas, particulate matter concentration, or emission rate using pollutant analyzer measurements and a conversion equation, graph, or computer program to produce results in units of the applicable emission limitation or standard.

CEMENT
Cement manufacturers produce 1,800 million metric tons of hydraulic cement worldwide every year.

CHEMICAL MANUFACTURING
Chemicals are an essential component of manufacturing and are vital to industries such as construction, motor vehicles, paper, electronics, transportation, and agriculture. Although some chemical manufacturers produce and sell consumer products such as soap, bleach, and cosmetics, most chemical products are used as intermediate products for other goods.

COMPOSTING
Composting is based on a biological treatment process which decomposes the organic portion of waste to produce a soil conditioner.  Composting produces emissions which are typically abated via biofiltration or incineration.

CONSULTANTS AND ENGINEERS
Consultants and engineers use emissions data to fine-tune abatement devices, optimize operating conditions, determine emission factors, and to fine-tune emission models, just to name a few.

ELECTROPLATING
The electroplating process involves the deposition of a thin metallic protective layer onto a prepared metal surface. Electroplating is a subset of metal finishing and surface coating.  Related industries include metal cleaning, painting and coating, and heat treating.

FOOD INDUSTRY
The food industry involves the commercial movement of food from field to fork. The modern food industry is the result of technological and cultural changes that have occurred over the last 150 years.

FOREST PRODUCTS
Forest products, including wood, fiberboard and paper are essential for everyday life.

INCINERATION
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LANDFILLS
Landfills are a subset of the waste management industry which serve at the disposal point for residential, commercial, and industrial waste. 54 percent of all waste is disposed of in landfills.

MANUFACTURING
The Manufacturing sector comprises establishments engaged in the mechanical, physical, or chemical transformation of materials, substances, or components into new products.

MARINE PROPULSION
Marine vessels generate emissions which can impact coastlines and communities near waterways.  The testing of these vessels introduces complexities not usually encountered with other sources.

MINING
The mining industry has been key to the development of civilization, underpinning the iron and bronze ages, the industrial revolution and the infrastructure of today's information age. In 2001, the mining industry produced over 6 billion tons of raw product valued at several trillion dollars. Downstream beneficiation and minerals processing of these raw materials adds further value as raw materials and products are created to serve all aspects of industry and commerce worldwide.

NATURAL GAS
Natural Gas is a vital component of the world's supply of energy. It is one of the cleanest, safest, and most useful of all energy sources.

PETROCHEMICAL
The petrochemical industry produces fuels, chemicals, and other products from petroleum and natural gas.  The chemicals and products are used to produce paint, paper, textile coatings, plastics, solvents, and many others.

POWER GENERATION
Power is generated primarily by steam turbine generators powered by steam produced from natural gas, coal, wood, and other fossil fuels.  Additional power generation sources include IC engines and renewable energy sources such as solar, wind, geothermal, and hydroelectric sources.

WASTE WATER TREATMENT
Wastewater treatment is a subset of the waste management industry which mainly involves processing muncipal wastewater.