+ UV index label

* AQ fixes
+ Sun/moon distance
+ moon position
* moon illumination

sensors/main.py

@@ -132,13 +132,17 @@ def vpd(tc, rh):
 
 def gas_to_aqi(gas_ohms, humidity, gas_reference):
     if gas_ohms is None: return None, None
-    score = min(max(round(min(gas_ohms/gas_reference,1.0)*75 + (25 - abs(humidity-40)*0.5)), 0), 100)
-    label = 'Very Poor'
-    if   score >= 80: label = 'Excellent'
-    elif score >= 60: label = 'Good'
-    elif score >= 40: label = 'Fair'
-    elif score >= 20: label = 'Poor'
-    return score, label
+    gas_score  = min(gas_ohms / gas_reference, 1.0) * 75
+    hum_score  = 25 - abs(humidity - 40) * 0.5
+    quality    = min(max(gas_score + hum_score, 0), 100)
+    aqi        = round((1 - quality / 100) * 500)
+    if   aqi <= 50:  label = 'Good'
+    elif aqi <= 100: label = 'Standard'
+    elif aqi <= 150: label = 'Warning'
+    elif aqi <= 200: label = 'Unhealthy'
+    elif aqi <= 300: label = 'Very Unhealthy'
+    else:            label = 'Hazardous'
+    return aqi, label
 
 def sea_level_pressure(pressure_hpa, alt_m):
     if alt_m is None: return None
@@ -362,6 +366,13 @@ def visibility_estimate(lux, humidity, solar_el=None):
         lux_factor = 1.0
     return round(base_km * hum_factor * lux_factor, 1)
 
+def uv_index_label(uvi):
+    if   uvi < 3:  return 'Low'
+    elif uvi < 6:  return 'Moderate'
+    elif uvi < 8:  return 'High'
+    elif uvi < 11: return 'Very High'
+    else:          return 'Extreme'
+
 def read_ltr(c, sensor, solar_el, humidity=None):
     global uv_dose_mj, uv_dose_date, last_uv_time
     global dli_lux_acc, dli_date, last_lux_time, daylight_start
@@ -414,7 +425,10 @@ def read_ltr(c, sensor, solar_el, humidity=None):
         'daily_light_integral': dli,
         'daylight':             daylight_hours,
         'visibility':           visibility_estimate(lux, humidity, solar_el) if humidity else None,
-    }, tags={'clouds_label': cloud_label or ''})
+    }, tags={
+        'clouds_label': cloud_label or ''
+        'uv_index_label': uv_index_label(uvi),
+    })
 
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