Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to protect yourself from air pollution [title] Research your city's air pollution levels. [step] You can use the environmental protection agency's (epa) airnow.gov website or the american lung association tools at stateoftheair. Org to find how high air pollution levels are in your town. Click on " city rankings " and " compare your air " tabs at the top of the page.

Ending1: [substeps] The formalized report link is located at the top right of every city's airbnb page. It can look like a link within a city's air filters website. Ending2: [title] Download the " state of the air " app onto your smartphone or other devices. [step] It will help you check air quality levels on a day-to-day basis. Ending3: [title] Replace as much air pollution with snow and ice. [step] In the last few years, pollution has been topping up in your town with snowfall. Ending4: When you see a " check for pollution " link, click on it. [substeps] Gps imaging is another tool available to help in noticing pollution, but it is outdated and needs a slightly different approach.

Answer format: ending1/ending2/ending3/ending4