'tertiary industry' is correct and usable in written English.
You can use it when referring to the third category of economic activity, typically services based and downstream from primary and secondary industry (e.g. agriculture and manufacturing). For example, "The tertiary industry in the region has seen tremendous growth in recent years."
"They can either join the tourism industry, the service industry or a tertiary industry," he said.
Reduction rates vary across provinces due to climatic variations and different development statuses of tertiary industry.
Generally, population growth, road construction, income increase, and tertiary industry development were the major drivers.
The government's tertiary industry index, which tracks spending on everything from banking to theme parks, jumped 1.7percentt in November from October, as demand for cellphones and recreation rose.
Two groups of economic drivers were identified: one group included fruit and seafood production, another included per capita income and proportion of tertiary industry.
From landscape level, the agriculture development has greater influence on wetland landscape during 1992 to 2001, while the primary, secondary, tertiary industry development all have impacts on wetland landscape during 2001 to 2007.
As mentioned previously, the main industries in Tokyo are tertiary industries which generate relatively less industrial waste than business waste.
On the other hand, the industrial composition effect of tertiary industries was close to neutral on CO2 emissions.
Accordingly, to increase environmental efficiency, it is necessary to shift to an industrial structure with a greater share of tertiary industries while increasing per worker GDP in tertiary industries.
3.5 into consideration, in addition to avoiding investment in useless buildings and roads, the key to improving environmental efficiency of production activities at the regional level is to shift to an industrial structure with a greater share of tertiary industries while achieving greater value-added in tertiary industries (Ministry of Economy, Trade and Industry 2014).
To improve the environmental efficiency of production activities in the prefectures identified above, it is necessary to avoid excessive investment in social infrastructure and to shift to an industrial structure with a greater share of tertiary industries while increasing per worker GDP in tertiary industries.
