Article Great Round World and What's Going on in It magazine--Anonymous author

The Sanitary Code is a set of rules enacted for the protection of the lives and health of the citizens. These rules relate to all matters that concern our daily life. They prohibit unhealthy businesses being carried on. They require that tenement houses shall be properly built, drained, etc. They prevent the keeping of cows, pigs, or poultry within city limits. They regulate the sale of provisions and prevent unwholesome food being sold in the city.

Under these rules, all the meat that is dressed for market within the limits of the city is inspected and must be prepared in a certain manner. No one can offer milk for sale without a permit from the Board of Health, and this permit is only granted when the inspectors have assured themselves that the applicants have clean and airy places in which to handle the milk.

What is the best paraphrase of the bold sentences in this paragraph?