'persistent hazard' is correct and usable in written English.
You can use it to refer to a hazard that persists over a long period of time. For example, "The cold weather brings with it the persistent hazard of icy roads."
And while citizen freelancing might be O.K. in an emergency -- to warn of, say, a fallen tree in the road, or an irritating relative visiting the neighborhood -- you face a more persistent hazard.
Traditionally, this has required a team of researchers and assistants to comb and partially clear the forest, and then to mark, measure, and map every fixed, man-made feature, down to the smallest carved stone, while being tormented by mosquitoes, black flies, heat, and the persistent hazard of venomous snakes.
Tephra fall has and continues to have impacts on communities in the region, including Baños and nearby cities (Le Pennec et al. [2011]) (Tobin & Whiteford [2002]), and lahars pose a persistent hazard even during periods of quiescence (Williams et al. [2008]).
As rates peak in the 5th and 6th decade, given an ageing population and increasing iatrogenic immunosuppression, reactivation of LTBI may be a persistent hazard in this population for several decades to come.
Using data from the NFFNMRS provided a unique opportunity to investigate new and persistent hazards that EMS responders encounter in their work environments.
It must include a strategy to conduct research necessary to protect children from persistent hazards that are widely dispersed in their environment.
As shown in Figure 2, the overall mortality hazard never reached zero; this led to the conclusion of a persistent risk of mortality.
For persistent environmental hazards that are widely disseminated in the environment, we need guidelines to clarify when randomized controlled trials are necessary to evaluate the safety and efficacy of preventive efforts.
However, the consistent results across varying levels of comorbidity and the persistent elevated hazards within strata of users and non-users matched for comorbid diagnoses strongly suggest that neither the level of individual health nor the presence of particular categories of comorbidity explains the bulk of the hazard associated with the use of hypnotic medications.
The objective of this paper is to report methodology developed for the assessment of the surface-water exposure to pesticide using as example the fungicide quinoxyfen because persistent, lipophylic and hazard for the aquatic organisms.
Once a persistent toxicant or hazard is widely disseminated in the environment, different types of research are necessary to ensure that we protect children.
