As we learned from yesterday's comments, sometimes riding the bus is convenient, and sometimes it's not. But perhaps the inconvenience is worth it, however, when there's an air alert day. On these days, air quality is not as good as others, and therefore, it's good to carpool and even better to not drive at all. To learn when these days happen in your neck of the woods, simply sign up to receive air alerts from a local nonprofit or clean air partnership. Just Google "air quality alerts" and your city's name to see how to get what you need.