Rural significant differences:
Less cars. This means that the noise pollution and issues will not be as prominent within the environment.
Less pollution. This means that pollution such as plastic, oils, gases, etc will not be as drastic compared to an urban area.
Less danger. Within a rural area, you have less people so therefore you can get to know them better and the threat of them hurting/harming you significantly changes.
Urban significant differences:
More pollution. A larger population means that there will be more and more careless people throwing things around.
More cars/noise. With more people, there will be more cars. This will significantly change the amount of noise pollution within that area.
More danger. A larger environment means that you will not be as close to everyone because of how many people there are, therefore increasing your rates of danger/threats.