title: How can I solve this using google bigQ
body: <p>An example problem to solve is to find the places in New York where it is least healthy to travel by a bicycle.</p>
  
  <p>Combine</p>
  
  <pre><code>https://bigquery.cloud.google.com/table/bigquery-public-data:openaq.global_air_quality and bigquery-public-data:new_york.citibike_stations
  </code></pre>
  
  <p>to find the top 5 bicycle rental stations in neighborhood of most air polluted NY areas.</p>
  
  <p>What time of the year is worst to travel by bicycle due to heavy air pollution?</p>
  
  <p>How to define neighborhood in terms of data that is present in the (both) sources?</p>