You need to take small steps at a time. Simply add an additional glass of water. Add fruits in your breakfast. Have lots of vegetables in your lunch and dinner.
When in polluted spaces have handkerchief covering your nose. When working on computer see to it that you walk away from your computer atleast every one and half hour.
There is no need to do aggressive exercises unless if you are advised to do so. Doing movements should be enough to keep your mobility and health in good state. One extremely amazing activity that happens to many automatically is pacing while talking on cell phones. This is a great activity especially if you are getting lot of calls and your each call is more than two minutes. This would be a great activity.
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