Note that I would expect OMNI to be sufficient for finding the resources for your assignment - if you need to expand your search, you may want to consider a database.
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To identify databases relevant to Occupational and Public Health, look at the database recommendations on the research guide for the program. Depending on your topic, other subject research guides may also be useful. For the topic of air pollution in schools, also consider that some databases related to Environmental Studies may also be relevant..
Use the Advanced Search options to create more detailed searches and expand relevant results
Play with synonyms (like terms) to expand your results, using Boolean logic (AND, OR, NOT) in databases
Use truncation, *, to search for root variant of words where applicable, e.g. vaccin* will retrieve vaccine, vaccines, vaccination
Separate your concepts into individual rows to include synonymous terms, e.g. mandate OR law
Modify your search where necessary, making use of field-specific searching, e.g. searching for your terms more narrowly in specific parts of the article, e.g. abstract
Take advantage of additional features in databases, which can help identify highly-cited research, specific types of research design, and other subsets of the literature
If the full-text of the article is not in the database, use the Check TMU Library links to find full-text, where available
Example of a Google Scholar search - Google Scholar is a freely available database, that you can link to TMU Libraries collections - video embedded below: