additional edits to sentinel-5p.md

Author: azlinszkysinergise

sentinel-5p/sentinel-5p.md

@@ -39,4 +39,8 @@ Sentinel-5P provides atmospheric measurements, relating to air quality, climate
  - [Cloud Top Pressure](/sentinel-5p/cloud-top-pressure)
  - [Cloud Base Pressure](/sentinel-5p/cloud-base-pressure)
  - [Cloud Optical Thickness](/sentinel-5p/cloud-optical-thickness)
- - [Cloud Effective Radiometric Fraction](/sentinel-5p/cloud-radiometric-fraction)
+ - [Cloud Effective Radiometric Fraction](/sentinel-5p/cloud-radiometric-fraction)
+
+ ### Additional Products
+
+ - [Nitrogen Dioxide monthly mean](/sentinel-5p/no2_monthly_mean)