This live page has been closed.

This live page has now been closed. You can continue to follow our coverage here.

Textbooks on wooden school desk with chalkboard. Textbooks on wooden school desk with chalkboard. Back to school. Textbooks stacked on wooden school desk in front of green chalkboard. Classroom ...

Record your observations about how the EPA ground measurements match the satellite image. Do areas with poor air quality (yellow, orange or red dots) correspond with haze in the satellite image? If so ...

The slices parameter specifies the number of slices to insert between each pair of profiles, either a scalar to insert the same number everywhere, or a vector to insert a different number between each ...