Table: air_quality_index
Columns: index
ozone_running_8_hourly_mean_g_m_3
nitrogen_dioxide_hourly_mean_g_m_3
sulphur_dioxide_15_minute_mean_g_m_3
pm10_particles_24_hour_mean_g_m_3
pm2_5_particles_24_hour_mean_g_m_3

Question: How many different index numbers are there for an ozone, running 8 hourly mean of 66-99?
SQL: SELECT COUNT("index") FROM air_quality_index WHERE "ozone_running_8_hourly_mean_g_m_3" = '66-99'

Question: What's the count of pm 10 particles when the pm 2.5 particles are at 59-66?
SQL: SELECT "pm10_particles_24_hour_mean_g_m_3" FROM air_quality_index WHERE "pm2_5_particles_24_hour_mean_g_m_3" = '59-66'

Question: What's the number of pm10 particles when sulphur dioxide is at 266-354?
SQL: SELECT "pm10_particles_24_hour_mean_g_m_3" FROM air_quality_index WHERE "sulphur_dioxide_15_minute_mean_g_m_3" = '266-354'

Question: What's the sulphur dioxide count when the ozone is at 121-140?
SQL: SELECT "sulphur_dioxide_15_minute_mean_g_m_3" FROM air_quality_index WHERE "ozone_running_8_hourly_mean_g_m_3" = '121-140'

Question: What's the sulphur dioxide count when the nitrogen dioxide is 468-534?
SQL: SELECT "sulphur_dioxide_15_minute_mean_g_m_3" FROM air_quality_index WHERE "nitrogen_dioxide_hourly_mean_g_m_3" = '468-534'

Question: What's the nitrogen dioxide count where the sulphur dioxide is at 0-88?
SQL: SELECT "nitrogen_dioxide_hourly_mean_g_m_3" FROM air_quality_index WHERE "sulphur_dioxide_15_minute_mean_g_m_3" = '0-88'