Update app.py

app.py

@@ -321,17 +321,20 @@ def fuel_norm_distribution_dashboard(root_dir, state_mapping_file, start_year=20
             # Download button
             st.markdown("### 📥 Download Filtered Data")
             
+            # Create an in-memory Excel file
             output = BytesIO()
             with pd.ExcelWriter(output, engine='xlsxwriter') as writer:
                 filtered_df.to_excel(writer, index=False, sheet_name="Filtered Data")
+            output.seek(0)  # Move to the beginning of the stream
             
+            # Download button for Excel
             st.download_button(
                 label="Download Excel",
                 data=output.getvalue(),
                 file_name="fuel_distribution_filtered.xlsx",
                 mime="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
-            )formats-officedocument.spreadsheetml.sheet")
-                
+            )
+                            
 
     with tab2:
         st.subheader("Emission Norm Distribution by State")
@@ -353,14 +356,14 @@ def fuel_norm_distribution_dashboard(root_dir, state_mapping_file, start_year=20
             st.plotly_chart(fig2, use_container_width=True)
     
             # Download button
-           st.markdown("### 📥 Download Filtered Norms Data")
-            
+           # 📥 Download button for filtered norms data (Excel only)
             norm_output = BytesIO()
             with pd.ExcelWriter(norm_output, engine='xlsxwriter') as writer:
                 filtered_norms.to_excel(writer, index=False, sheet_name="Filtered Norms")
+            norm_output.seek(0)
             
             st.download_button(
-                label="Download Excel",
+                label="Download Filtered Norms Data",
                 data=norm_output.getvalue(),
                 file_name="norm_distribution_filtered.xlsx",
                 mime="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"