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If enforcement of the new rules leaves some tankers excluded from delivering to the United States , it may aggravate the scarcity . Ethno-religious and geographic fissures may aggravate such contrasts . ( For example , the IMF has strongly urged Germany to be flexible in observing the budget constraints of the European Stability and Growth Pact , lest the government aggravate Germany 's already severe economic slowdown . There is no constitutional requirement that all matters that mitigate or aggravate a particular offense must be made elements of a crime , to be proved to a jury beyond a reasonable doubt . Severe air pollution , which can aggravate or lead to respiratory problems , often occurs throughout the country during the dry season due in large part to widespread forest fires and agricultural burning .