Day by day / increasingly (日益 / 日趋)

Structure 日益 / 日趋 + disyllabic adjective/verb (no degree word: ✗很日益)

日益 (rìyì) and 日趋 (rìqū) are adverbs of journalism and essay marking a steady, progressive increase: "day by day", "increasingly". 环境问题日益突出 = "environmental problems are becoming ever more prominent". They match 越来越… (HSK 3) in meaning, but are written and formal and only precede disyllabic words (突出, 严重, 激烈), never an adjective with 很. Nuance: 日趋 stresses the TREND toward a state (竞争日趋激烈 = "competition is trending toward fiercer"), whereas 日益 simply marks gradual intensification.

Examples

随suí着zhe经jīng济jì发fā展zhǎn，环huán境jìng问wèn题tí日rì益yì突tū出chū。
As the economy develops, environmental problems are becoming ever more prominent.
两liǎng国guó的de合hé作zuò日rì益yì密mì切qiè。
Cooperation between the two countries grows ever closer.
随suí着zhe对duì手shǒu增zēng多duō，市shì场chǎng竞jìng争zhēng日rì趋qū激jī烈liè。
As rivals multiply, market competition grows ever fiercer by the day.
社shè会huì结jié构gòu日rì趋qū复fù杂zá，治zhì理lǐ难nán度dù随suí之zhī上shàng升shēng。
The social structure is growing steadily more complex, and the difficulty of governing it rises accordingly.

Levels are indicative: they follow the standard Chinese Grammar Wiki (AllSet Learning) progression, not an official HSK 3.0 mapping. We never assign levels by eye.

This point and the other 370, with audio on every example, inside Wanyu.